| |
CX2SA > SATDIG 02.04.08 02:00l 809 Lines 28816 Bytes #999 (0) @ WW
BID : 56853-CX2SA
Read: GUEST
Subj: AMSAT-BB-digest V3 162
Path: IZ3LSV<IW2OHX<IQ0LT<IK2XDE<DB0RES<ON0AR<I0TVL<CX2SA
Sent: 080401/2320Z @:CX2SA.LAV.URY.SA #:56853 [Minas] FBB7.00e $:56853-CX2SA
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: 2401/144 down conveter and antenna questions (Alan)
2. Re: ARR pre amp Query (John W Lee)
3. Re: AMSAT-BB Digest, Vol 3, Issue 161 (Mark L. Hammond)
4. Re: Question about Frequencies to use on VO-52 (George Henry)
5. RHC or LHC? (w0dxz(AT)aol.com)
6. Re: Preamp for a Mobile Application (Edward Cole)
7. Re: Preamp for a Mobile Application (Ronald Nutter)
8. Feedback on downlink on VO-52 (Ronald Nutter)
9. (no subject) (McnamMart(AT)aol.com)
10. Re: 2401/144 down conveter and antenna questions (Edward Cole)
11. AO-51 APRS (Mineo Wakita)
12. Yaesu G-5500 Connectors (Joel Kandel)
13. Re: Feedback on downlink on VO-52 (Ronald Nutter)
14. Digital (Packet) from a Vehicle (Kent R. Frazier)
----------------------------------------------------------------------
Message: 1
Date: Mon, 31 Mar 2008 15:05:28 -0500
From: "Alan" <ve4yz(AT)mts.net>
Subject: [amsat-bb] Re: 2401/144 down conveter and antenna questions
To: "'CLAUDIA PIRKL'" <timn5ki(AT)dishmail.net>, <AMSAT-BB(AT)amsat.org>
Message-ID: <001301c8936a$91163fb0$0602a8c0(AT)athlon>
Content-Type: text/plain; charset="us-ascii"
Hi Tim and the group... Check AMSAT Journal May/June 2006 and Aug/July 2007
for articles by VE3NPC on helical design and boom materials.
Quoting from conclusion in the May/June 2006 Page 20 #3 "The use of aluminum
for boom material has no affect on performance and the use of PVC also has
minimal affect ( at least for antennas up to 3 wavelengths in length)."
Use a bias-tee to power the down converter. Depending on the power
regulator inside, you may be able to power it with as little as 12VDC. You
need a signal source to confirm it is working at whatever voltage you find
will run on. A noisy computer, a WIFI router/access point etc will do it
for a signal source. Otherwise, making a source such as
http://ve2zaz.net/SigSourc/SigSourc.htm is very handy and inexpensive.
-----Original Message-----
From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
Behalf Of CLAUDIA PIRKL
Sent: March 31, 2008 12:51 PM
To: AMSAT-BB(AT)amsat.org
Subject: [amsat-bb] 2401/144 down conveter and antenna questions
Hello all. I found a 2401/144 down converter on the internet but when it
came in the mail there was no info with it. It is a TranSystem Model
AIDC-3733 and I think it came from K5GNA.
I removed one cover (antenna on left/144 IF facing me) and found a wire with
one end not connected. I realize it needs some DC volts to operate but how
much and where it needs to be brought in. Does any one have any info to
help me out?
On the internet there a few helix antenna designs for 2401. I found a piece
of 1" PVC and some AL. ground wire. I wrapped the wire around the PVC and
came up with the 4cm dia. the article talked about. But, in another article
(435 Mhz) it was mentioned the PVC was very lossy. What do you think??
Thanks for any help!!
Tim N5KI EM65
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 2
Date: Mon, 31 Mar 2008 12:11:03 -0800
From: John W Lee <k6yk(AT)juno.com>
Subject: [amsat-bb] Re: ARR pre amp Query
To: ve4yz(AT)mts.net
Cc: amsat-bb(AT)amsat.org, billdz.geo(AT)yahoo.com
Message-ID: <20080331.121847.1836.4.k6yk(AT)juno.com>
Content-Type: text/plain; charset=us-ascii
I have an FT-847 with the good internal preamps.
The ARR SP432VDG even makes this setup BETTER!
I use both the internal and SP-432VDG. Signals are
mostly VERY good. Also use a 20 element beam on the downlink.
When I say VERY good, I mean over S9 a lot of the time and all
over the place between zero and 60 over 9. That way, you don't have to
be so careful in aiming the antenna, and you can hear the birds basically
100% of the time.
If the signal goes down a few S-units you can move the antenna and get it
back up again. Without all that, when it goes down a few S-units, it's
GONE!
Regarding the power cable, I have been using two of these preamps for
years
and years with a small cable attached and no problems.
73
John K6YK
On Mon, 31 Mar 2008 14:03:10 -0500 "Alan" <ve4yz(AT)mts.net> writes:
> Very timely discussion for me as the snow sloooowwly disappears and
> the
> return of the Canada geese and robins signals the time for tower
> work :-)
>
> Some previous comments suggest that a preamp near the rig is not
> significant, but, I suggest otherwise as my Ft-847 internal preamps
> can make
> a significant difference in RX. Anecdotal, not empirical, but I can
> hear
> the diff at the push of a button.
>
> Now, I am consider mast mounted preamps as an alternative to my
> FT-847
> internal preamps for one of my sites. I run Landwehr VHF and UHF
> preamps at
> 2 other locations and they are terrific! They are also almost 20
> years old
> and no longer available :-(
>
> The preamps on the AR2 site look like what I could use.
>
> My questions are... Is the sequencer
>
> http://www.advancedreceiver.com/page20.html
>
> really necessary or recommended when using the MSP432VD-25 or
> MSP144VDG-25
> preamps? My first thought is NO. 15-20 years of use of 4 Landwehr
> preamps
> without a sequencer is my rational.
>
> Finally, does anyone have a nice "warranty voiding" hack to get
> around the
> these different power connectors we see on indoor preamps and down
> converters such as my KEPS http://www.keps.it/images/13lnc72db_m.jpg
> ?
> Instead of soldering to the pin and a ground lug
>
> http://picasaweb.google.com/ve4yz.alan/24Ghz/photo#5172119570416133618
>
> Something as simple as removing the connector from the case and
> running a
> cable through the remaining hole, soldered internally with something
> like
> Anderson Power Poles at the other end for 12VDC????? I'm going to
> do it one
> day, but would rather have someone else confirm that it would work
> without
> adversely effecting performance characteristics. No guts; no glory
> here.
>
>
> Thanks for any feedback
>
> 73, Alan VE4YZ
> EN19kw
> AMSAT LM 2352
> http://www.mts.net/~ve4wsc/
> AMSAT A-485
>
>
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the
> author.
> Not an AMSAT-NA member? Join now to support the amateur satellite
> program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>
------------------------------
Message: 3
Date: Mon, 31 Mar 2008 17:03:04 -0400 (EDT)
From: "Mark L. Hammond" <n8mh(AT)embarqmail.com>
Subject: [amsat-bb] Re: AMSAT-BB Digest, Vol 3, Issue 161
To: amsat-bb(AT)amsat.org, ve4yz(AT)mts.net
Message-ID:
<1805414459.308551206997384869.JavaMail.root(AT)pd02.embarq.synacor.com>
Content-Type: text/plain; charset=utf-8
Hi Alan,
For your KEPS downconverter---you can power it through the coax! That's the
slickest way to power that fine peice of hardware without any muss or fuss.
I lashed up a homebrew coax injector that has Anderson power pole connectors
on it. Works like a champ.
73,
Mark N8MH
_______________________________________________
Date: Mon, 31 Mar 2008 14:03:10 -0500
From: "Alan" <ve4yz(AT)mts.net>
Subject: [amsat-bb] Re: ARR pre amp Query
To: "'Bill Dzurilla'" <billdz.geo(AT)yahoo.com>, <amsat-bb(AT)amsat.org>
Message-ID: <000f01c89361$dcea1be0$0602a8c0(AT)athlon>
Content-Type: text/plain; charset="us-ascii"
Very timely discussion for me as the snow sloooowwly disappears and the
return of the Canada geese and robins signals the time for tower work :-)
Some previous comments suggest that a preamp near the rig is not
significant, but, I suggest otherwise as my Ft-847 internal preamps can make
a significant difference in RX. Anecdotal, not empirical, but I can hear
the diff at the push of a button.
Now, I am consider mast mounted preamps as an alternative to my FT-847
internal preamps for one of my sites. I run Landwehr VHF and UHF preamps at
2 other locations and they are terrific! They are also almost 20 years old
and no longer available :-(
The preamps on the AR2 site look like what I could use.
My questions are... Is the sequencer
http://www.advancedreceiver.com/page20.html
really necessary or recommended when using the MSP432VD-25 or MSP144VDG-25
preamps? My first thought is NO. 15-20 years of use of 4 Landwehr preamps
without a sequencer is my rational.
Finally, does anyone have a nice "warranty voiding" hack to get around the
these different power connectors we see on indoor preamps and down
converters such as my KEPS http://www.keps.it/images/13lnc72db_m.jpg ?
Instead of soldering to the pin and a ground lug
http://picasaweb.google.com/ve4yz.alan/24Ghz/photo#5172119570416133618
Something as simple as removing the connector from the case and running a
cable through the remaining hole, soldered internally with something like
Anderson Power Poles at the other end for 12VDC????? I'm going to do it one
day, but would rather have someone else confirm that it would work without
adversely effecting performance characteristics. No guts; no glory here.
Thanks for any feedback
73, Alan VE4YZ
EN19kw
AMSAT LM 2352
http://www.mts.net/~ve4wsc/
AMSAT A-485
--
Mark L. Hammond [N8MH]
------------------------------
Message: 4
Date: Mon, 31 Mar 2008 16:09:26 -0500 (GMT-05:00)
From: George Henry <ka3hsw(AT)earthlink.net>
Subject: [amsat-bb] Re: Question about Frequencies to use on VO-52
To: amsat-bb(AT)amsat.org
Message-ID:
<24319276.1206997766121.JavaMail.root(AT)elwamui-
rustique.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
-----Original Message-----
>From: Ronald Nutter <rnutter(AT)networkref.com>
>Sent: Mar 31, 2008 11:47 AM
>To: amsat-bb(AT)amsat.org
>Subject: [amsat-bb] Question about Frequencies to use on VO-52
>
>I am trying to learn how to use the SSB birds. What are the "starting"
>frequencies that most use for uplink and downlink ? If I understand
>this correctly, you will leave the uplink set and then only tweak the
>downlink ?
>
>Thanks,
>
>Ron
>KA4KYI
The convention on the linear birds is that the lower half of the downlink
passband is for CW, and the upper half is SSB. So, you should pick an uplink
frequency that will place your downlink in the appropriate half of the
passband, and then adjust the higher of the two for doppler. In the case of
VO-52, that means picking a frequency in the LOWER half (435.2200 - 435.2500)
of the uplink passband in order to appear in the UPPER half (145.9000 -
145.9300) of the downlink passband (VO-52 uses an inverting transponder), and
adjust only your uplink to keep your downlink frequency constant. And it's
LSB on the uplink to give USB on the downlink.
The ideal situation, if you have a radio that is CAT ready, is to use
something like SatPC32 that will adjust BOTH your uplink and downlink for
doppler, as well as automatically setting the uplink frequency that
corresponds to your chosen downlink.
Enjoy! VO-52 is an awesome satellite!
George, KA3HSW
------------------------------
Message: 5
Date: Mon, 31 Mar 2008 17:39:18 -0400
From: w0dxz(AT)aol.com
Subject: [amsat-bb] RHC or LHC?
To: amsat-bb(AT)amsat.org
Message-ID: <8CA618ECE9D6896-1260-1DB2(AT)webmail-nd11.sysops.aol.com>
Content-Type: text/plain; charset="us-ascii"
I have this old CCraft? 432 beam i want to try,? it is wired for LHC,,, I can
rewire it for RHC... which would be better, R or L?? I wont be able switch
between the two.?? (for now)
If I can only use? one, R or L, would that still be better than a standard 2M
beam turned at 45 degrees?
Bob W0DXZ
------------------------------
Message: 6
Date: Mon, 31 Mar 2008 17:56:30 -0800
From: Edward Cole <kl7uw(AT)acsalaska.net>
Subject: [amsat-bb] Re: Preamp for a Mobile Application
To: Jeff Mock <jeff(AT)mock.com>, AMSAT-BB <amsat-bb(AT)amsat.org>
Message-ID: <200804010156.m311uUWa018075(AT)hermes.acsalaska.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Jeff,
You are partly correct, but the main job of the preamp is to lower
the noise figure of the overall receiving system. The gain in the
preamp is primarly to provide a strong enough signal for the
following receiver that its noise figure is not significant. Having
enough gain is important so that there is enough extra too overcome
coax line loss and still have sufficient gain left over at the
receiver (approx. 15-dB is needed).
So, a preamp can help a mobile satellite station if there is a way to
install it. If your radio only has one antenna connector for both 2m
and 70cm, then it will not be possible to use a preamp for a full
duplex radio. If it is not able to operate duplex then a switching
preamp would work OK.
73 Ed - KL7UW
At 09:52 AM 3/31/2008, Jeff Mock wrote:
>It's not clear that a preamp will improve your reception. The 2720H has
>a pretty sensitive receiver. The preamp will help you if the noise
>figure of the preamp is better than the noise figure of your radio.
>It's not clear to me that you can make much of an improvement here.
>
>I have a preamp on the masthead at home, but I have a long feedline from
>my receiver to the antenna, I have about 7db of loss from the antenna to
>the radio at 70cm and I get a noticeable improvement with a preamp. The
>main job of my preamp is to overcome the loss of the feedline, otherwise
>the preamp is not that much better than the radio.
>
>jeff
>AD6EO
>
>Kent R. Frazier wrote:
> > Hi all,
> >
> > I am really enjoying the satellite aspect of the hobby and have enjoyed
the
> > contacts I have made with my Icom IC-2720H with a 19" whip antenna from my
> > vehicle. I have seen talk recently of using a preamp to improve the
> > reception. From what I've read and understand, it appears that a
> "switching"
> > preamp is needed for a setup using only one antenna for Tx and Rx such as
> > mine. Is this correct?
> >
> > It also appears that most of the preamps are mast mounted. Since this
would
> > not be an option for me can the preamp be put near the transceiver? Are
> > there any issues that result of doing so?
> >
> > Lastly, what preamp(s) would you recommend for an application such as
mine?
> >
> >
> > Thanks,
> >
> > Kent
> >
>
>_______________________________________________
>Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 7
Date: Mon, 31 Mar 2008 22:37:20 -0500
From: Ronald Nutter <rnutter(AT)networkref.com>
Subject: [amsat-bb] Re: Preamp for a Mobile Application
To: Edward Cole <kl7uw(AT)acsalaska.net>
Cc: AMSAT-BB <amsat-bb(AT)amsat.org>
Message-ID: <47F1ADF0.9000708(AT)networkref.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Ed:
If you use a Comet Diplexer such as the CF160 that I have, it can split
things out to two antennas and then you can use a preamp on the receive
side. I have used that approach when I have worked sats low to the
horizon or when I had time to find a good parked position with a clear
view of the sky.
Ron
KA4KYI
Edward Cole wrote:
> Jeff,
>
> You are partly correct, but the main job of the preamp is to lower
> the noise figure of the overall receiving system. The gain in the
> preamp is primarly to provide a strong enough signal for the
> following receiver that its noise figure is not significant. Having
> enough gain is important so that there is enough extra too overcome
> coax line loss and still have sufficient gain left over at the
> receiver (approx. 15-dB is needed).
>
> So, a preamp can help a mobile satellite station if there is a way to
> install it. If your radio only has one antenna connector for both 2m
> and 70cm, then it will not be possible to use a preamp for a full
> duplex radio. If it is not able to operate duplex then a switching
> preamp would work OK.
>
> 73 Ed - KL7UW
>
> At 09:52 AM 3/31/2008, Jeff Mock wrote:
>> It's not clear that a preamp will improve your reception. The 2720H has
>> a pretty sensitive receiver. The preamp will help you if the noise
>> figure of the preamp is better than the noise figure of your radio.
>> It's not clear to me that you can make much of an improvement here.
>>
>> I have a preamp on the masthead at home, but I have a long feedline from
>> my receiver to the antenna, I have about 7db of loss from the antenna to
>> the radio at 70cm and I get a noticeable improvement with a preamp. The
>> main job of my preamp is to overcome the loss of the feedline, otherwise
>> the preamp is not that much better than the radio.
>>
>> jeff
>> AD6EO
>>
>> Kent R. Frazier wrote:
>>> Hi all,
>>>
>>> I am really enjoying the satellite aspect of the hobby and have enjoyed
the
>>> contacts I have made with my Icom IC-2720H with a 19" whip antenna from my
>>> vehicle. I have seen talk recently of using a preamp to improve the
>>> reception. From what I've read and understand, it appears that a
>> "switching"
>>> preamp is needed for a setup using only one antenna for Tx and Rx such as
>>> mine. Is this correct?
>>>
>>> It also appears that most of the preamps are mast mounted. Since this
would
>>> not be an option for me can the preamp be put near the transceiver? Are
>>> there any issues that result of doing so?
>>>
>>> Lastly, what preamp(s) would you recommend for an application such as
mine?
>>>
>>>
>>> Thanks,
>>>
>>> Kent
>>>
>> _______________________________________________
>> Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 8
Date: Mon, 31 Mar 2008 22:40:25 -0500
From: Ronald Nutter <rnutter(AT)networkref.com>
Subject: [amsat-bb] Feedback on downlink on VO-52
To: AMSAT-BB <amsat-bb(AT)amsat.org>
Message-ID: <47F1AEA9.8060805(AT)networkref.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Thanks to the help of several on this listserv, I was able to get a
contact on VO-52 until I lost coordination on keeping the rotor turned
and the IC910H tweaked the right way on the VFO's. I had problems
finding my downlink because of what I think is desensing on the 2M downlink.
Can I resolve this by putting a filter on the 2M receive to stop the
desensing like I would on the UHF receive on the FM birds ? If not, is
there another way to fix the problem ?
Thanks to W0EOZ for putting up with me while I was trying to figure
things out. Hopefully my next contacts will last a bit longer <G>.
Ron
KA4KYI
------------------------------
Message: 9
Date: Mon, 31 Mar 2008 20:08:14 EDT
From: McnamMart(AT)aol.com
Subject: [amsat-bb] (no subject)
To: amsat-bb(AT)amsat.org
Message-ID: <d28.226fc3ab.3522d6ee(AT)aol.com>
Content-Type: text/plain; charset="US-ASCII"
hi jack how clean is the kenwood 811 and what is your price to n.ireland
thanks martin
------------------------------
Message: 10
Date: Mon, 31 Mar 2008 23:06:33 -0800
From: Edward Cole <kl7uw(AT)acsalaska.net>
Subject: [amsat-bb] Re: 2401/144 down conveter and antenna questions
To: <AMSAT-BB(AT)amsat.org>
Message-ID: <200804010706.m3176XBI075249(AT)iris.acsalaska.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Alan and Tim,
I built my helix dish feed using a short piece of approx. 1-inch
diameter PVC with no discernable effect. I have a steel bolt running
up the center inside the helix for support (not electrically
connected to the helix). If well centered along the axis of the
helix the bolt does not effect the pattern or impedance of the helix.
http://www.kl7uw.com/sat.htm
A sure-fire way to test the PVC is to place it inside a microwave
oven and heat it for about a minute. If it gets hot then do not use
it. If only slightly warm its OK. CAUTION: DO place a cup of water
in the oven with the plastic to act as a load for the oven...you
should never run a microwave oven empty as there is no RF load for
the magnetron (sort of like transmitting without an antenna). The
water insures that there is a load.
73 Ed - KL7UW
At 12:05 PM 3/31/2008, Alan wrote:
>Hi Tim and the group... Check AMSAT Journal May/June 2006 and Aug/July 2007
>for articles by VE3NPC on helical design and boom materials.
>
>Quoting from conclusion in the May/June 2006 Page 20 #3 "The use of aluminum
>for boom material has no affect on performance and the use of PVC also has
>minimal affect ( at least for antennas up to 3 wavelengths in length)."
>
>Use a bias-tee to power the down converter. Depending on the power
>regulator inside, you may be able to power it with as little as 12VDC. You
>need a signal source to confirm it is working at whatever voltage you find
>will run on. A noisy computer, a WIFI router/access point etc will do it
>for a signal source. Otherwise, making a source such as
>http://ve2zaz.net/SigSourc/SigSourc.htm is very handy and inexpensive.
>
>
>
>
>
>
>-----Original Message-----
>From: amsat-bb-bounces(AT)amsat.org [mailto:amsat-bb-bounces(AT)amsat.org] On
>Behalf Of CLAUDIA PIRKL
>Sent: March 31, 2008 12:51 PM
>To: AMSAT-BB(AT)amsat.org
>Subject: [amsat-bb] 2401/144 down conveter and antenna questions
>
>Hello all. I found a 2401/144 down converter on the internet but when it
>came in the mail there was no info with it. It is a TranSystem Model
>AIDC-3733 and I think it came from K5GNA.
>I removed one cover (antenna on left/144 IF facing me) and found a wire with
>one end not connected. I realize it needs some DC volts to operate but how
>much and where it needs to be brought in. Does any one have any info to
>help me out?
>
>On the internet there a few helix antenna designs for 2401. I found a piece
>of 1" PVC and some AL. ground wire. I wrapped the wire around the PVC and
>came up with the 4cm dia. the article talked about. But, in another article
>(435 Mhz) it was mentioned the PVC was very lossy. What do you think??
>
>Thanks for any help!!
>
>Tim N5KI EM65
>_______________________________________________
>Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
>_______________________________________________
>Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 11
Date: Tue, 01 Apr 2008 20:05:55 +0900
From: Mineo Wakita <ei7m-wkt(AT)asahi-net.or.jp>
Subject: [amsat-bb] AO-51 APRS
To: amsat-bb(AT)amsat.org
Message-ID: <15C893E85BAB5Fei7m-wkt(AT)asahi-net.or.jp>
Content-Type: text/plain; charset=us-ascii
AO-51 is working now as L/U digital mode.
We hope to open 'APRS findu.com' of AO-51 L/U.
JH1BCL>APRS,PACB-1* [04/01/08 10:40:49z] <UI>:HELLO ALL GE vir AO-51 L/U PKT
JE9PEL>APRS,PACB-1* [04/01/08 10:41:31z] <UI R>:=3523.05N/13936.61E- Yokohama
Japan {UIV32}
JA5BLZ>APRS,PACB-1* [04/01/08 10:42:20z] <UI>::JE9PEL :GE UR 599 TNX
------------------------------
Message: 12
Date: Tue, 1 Apr 2008 10:29:26 -0400
From: "Joel Kandel" <kandelj(AT)bellsouth.net>
Subject: [amsat-bb] Yaesu G-5500 Connectors
To: "AMSAT-BB" <amsat-bb(AT)amsat.org>
Message-ID: <35DDD7ABDD864A2A8310F02F19C5E6A7(AT)OwnerPC>
Content-Type: text/plain; charset="Windows-1252"
I found a 2003 AMSAT thread from Wayne, W9AE, indicating that there was a
source for purchasing extra 7 pin connectors for the G-5500 az/el rotor. That
was Advanced Industrial Products, but with a long lead time.
Since then, has anyone found another source for these connectors (Nanaboshi
NJC-207-PF), or another manufacturer?
Thank you,
Joel Kandel, KI4T
------------------------------
Message: 13
Date: Tue, 01 Apr 2008 10:12:03 -0500
From: Ronald Nutter <rnutter(AT)networkref.com>
Subject: [amsat-bb] Re: Feedback on downlink on VO-52
To: George Henry <ka3hsw(AT)earthlink.net>, "amsat-bb(AT)amsat.org >>
AMSAT-BB" <amsat-bb(AT)amsat.org>
Message-ID: <47F250C3.7020801(AT)networkref.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
I am using seperate antennas and feedlines. For the time being, I am
using a Channel Master antenna to turn the antennas. I have a pvc pipe
rig setup with the antennas at an angle of 25 degrees due to the clutter
in the neighborhood I have to clear to see the sats. I hope to have a
tower in the future but with being laid off from my job, cant really
have any expenditures right now.
I have the cat interface for the IC910H but havent looked into how to
set it up yet.
Ron
KA4KYI
George Henry wrote:
> -----Original Message-----
>> From: Ronald Nutter <rnutter(AT)networkref.com>
>> Sent: Mar 31, 2008 10:40 PM
>> To: AMSAT-BB <amsat-bb(AT)amsat.org>
>> Subject: [amsat-bb] Feedback on downlink on VO-52
>>
>> Thanks to the help of several on this listserv, I was able to get a
>> contact on VO-52 until I lost coordination on keeping the rotor turned
>> and the IC910H tweaked the right way on the VFO's. I had problems
>> finding my downlink because of what I think is desensing on the 2M
downlink.
>>
>> Can I resolve this by putting a filter on the 2M receive to stop the
>> desensing like I would on the UHF receive on the FM birds ? If not, is
>> there another way to fix the problem ?
>>
>> Thanks to W0EOZ for putting up with me while I was trying to figure
>> things out. Hopefully my next contacts will last a bit longer <G>.
>>
>> Ron
>> KA4KYI
>
> Are you using separate 2 meter and 70 cm antennas with separate feedlines,
or diplexing onto a single feedline to a single antenna? First thing to do is
reduce your uplink power as much as possible while still being heard. If you
are diplexing to a single feedline, you only have about 60dB or so of
isolation, so too much uplink power can exceed that. You should be able to
work VO-52 with 25 watts or less...
>
> I have never experienced desense on 2 meters from my 70 cm uplink... only
the reverse, which can be cured with separate feedlines and antennas, ample
separation between the antennas, and the diplexer-as-filter trick found at
<http://www.amsat.org/amsat-new/articles/Mode-J/>
>
> And I strongly recommend buying or building a CAT interface and letting your
tracking program take care of tuning the radio (and turning the rotors, if you
buy or build a rotor interface as well). The demo version of SatPC32 is fully
functional except for saving your station parameters, and can be downloaded
from <www.dk1tb.de/indexeng.htm>.
> If you like it, register it: all proceeds go directly to AMSAT. A CAT
interface PC board with the harder-to-find chips included is available from
<www.farcircuits.net> and only costs about $20 to build. The FOD-Track rotor
control PC board is also available from Far Circuits, and will cost $45 - $50
to build. The LVB Tracker is available thru the AMSAT store, and has the
advantage of being able to operate without a computer attached... nice for
mobile ops!
>
> Go for the radio control first: that'll free you up to deal with the rotors
manually, and they demand far less attention than tuning does.
>
> 73,
> George, KA3HSW
>
>
>
>
------------------------------
Message: 14
Date: Tue, 1 Apr 2008 10:59:26 -0500
From: "Kent R. Frazier" <k5knt(AT)amsat.org>
Subject: [amsat-bb] Digital (Packet) from a Vehicle
To: AMSAT-BB <amsat-bb(AT)amsat.org>
Message-ID:
<7caa889a0804010859t77e56b2ft82b5204a84bfebc4(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
We are currently renting and the landlord will not allow any external
antennas. As such I'm limited to working the satellites from my vehicle. Is
it possible to work the packet or digital satellites this way and if so what
equipment would be needed?
Thanks,
Kent
--
Kent R. Frazier, K5KNT
------------------------------
_______________________________________________
Sent via amsat-bb(AT)amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 3, Issue 162
****************************************
Read previous mail | Read next mail
| |
