[ARC5] [armyradios] BC-221 Coupling

[Jay Coward]

John
 If you have a "stock" frequency meter you can couple with a small series cap say 100pF to some convienient point in what you want to couple to. If you have a "modified" freq. meter with a coax connector I would advise an adapter cable with a DC blocking cap, again 100pF.(and voltage rated for what your doing).
 I don't think these frequency meters were designed with "impedance matching" in mind. They are "brute force" instruments in that close air coupling works for the intended purpose. Improving on that may not be worth the effort.
 I do not recomend useing one of these for an IF alignment except for very narrow bandwidths. Maybe one could actualy sweep one of these with a voltage ramp and  varactor diode to make a narrow band sweeper for IF alignment and couple the detecter to an O'scope but probably more trouble than worth. But then if you have one that has no cal book and you can "cal" it against another with a cal book for the frequencies of interest then maybe you might find that as a useful experimenting platform.  
 I've always thought the LM could make a really hot regen rx with the proper mods. When the 80 and 40 bands are long and quiet I've hooked the long wire to the LM and had very good clear copy, although low audio.
 Jay 


-----Original Message-----
From: J. Forster <jfor at quikus.com>
To: ARC5 <ARC5 at mailman.QTH.net>; Milsurplus <Milsurplus at mailman.QTH.net>
Cc: ArmyRadios <ArmyRadios at yahoogroups.com>
Sent: Wed, Nov 14, 2012 2:03 pm
Subject: [armyradios] BC-221 Coupling


 

Hi,

Much WW II gear used open wire antenna connections, so a BC-221 could just
be coupled by being placed nearby. Modern gear generally uses coax.

I've not seen any well thought out adapters to couple a BC-221 to coax.
Has anybody? I'm not much of a fan of just sticking a small nearby as a
coupling means.

-John

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