| |
G8MNY > TECH 26.01.20 19:30l 40 Lines 1478 Bytes #999 (0) @ WW
BID : 41772_GB7CIP
Read: GUEST
Subj: 50ê - 72ê HF Balun
Path: IZ3LSV<IK6IHL<IK7NXU<HB9ON<IW2OHX<IR1UAW<I0OJJ<I0OJJ<GB7CIP
Sent: 200122/1107Z @:GB7CIP.#32.GBR.EURO #:41772 [Caterham Surrey GBR]
>From g8mny%gb7cip.#32.gbr.euro@i0ojj.ampr.org Wed Jan 22 12:10:42 2020
Received: from i0ojj.ampr.org by i0ojj.ampr.org (JNOS2.0m.1rc) with SMTP
id AA97036 ; Wed, 22 Jan 2020 12:10:42 +0100
Message-Id: <41772_GB7CIP@i0ojj.bbs>
>From: g8mny@gb7cip.#32.gbr.euro
X-JNOS-User-Port: Telnet (i0ojj @ 44.134.32.240) -> Sending message
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
Here is 1.2:1 balun for HF freq`s (Updated Mar 05)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
At this turns ratio the ferrite has to handle 65% of the RF power! It is useful
where the unbalanced feeder's outer may be at a high Z & a choke balun will not
work!
Turns Ratio 10:12 giving a Z ratio of 1:1.44
e.g. 10 turns for 50ê, 12 turns for 72ê Balanced.
ÚÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄo
³ ³10 ³6 0
³ ³Ú¿Ú¿Ú¿Ú´Ú¿Ú¿Ú¿Ú¿Ú¿ÚÄÄÄ¿
³ ÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙÀÙ ³ 72ê
50ê Txr ³ ß ³ ±±±±±±±±±±±±±±±±±±±± ³ Balanced
Unbalanced ÀÄÂÄÙ ±±±±±±±±±±±±±±±±±±±± ³ Dipole
³ Ú¿Ú¿Ú¿Ú¿Ú¿Ú¿ ³
³ ³ÀÙÀÙÀÙÀÙÀÙÀÄÄÄ)ÄÄÄÄÄÄÄÄÄÄÄo
³ ³6 0 ³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
6 bifilair turns + 4 on Amidon T 200-2 TOROID CORE
Make sure the windings are phase & connected correctly.
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
Read previous mail | Read next mail
| |
