[Collins] 32V-1

[jeremy-ca]

Nope, its a slug tuned affair driven by the rack. It then goes to the 
regular band coils.

I bet that bad DowKeys have destroyed many receiver front ends over the 
years. The ones Ive looked at have arcing build up on the TX side and when 
it builds up enough the TX and RX are connected. Reminds me of an automotive 
vibrator.
Probably a result of filing the contacts.

Carl
KM1H


----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj at storm.weather.net>
To: "jeremy-ca" <km1h at jeremy.mv.com>
Cc: <collins at mailman.qth.net>
Sent: Sunday, December 16, 2007 9:15 PM
Subject: Re: [Collins] 32V-1


> On Sun, 2007-12-16 at 17:59 -0500, jeremy-ca wrote:
>> The 75A1 uses a common input transformer/coil on all bands. The secondary 
>> is
>> fed to the individual band coils.
>
> A balun or what? Those weren't great days for broad band transformers?
> Not something I find in the 75A2 schematic. I've not seen a schematic
> for a 75A1. Can it be run without that RF transformer with just a bit of
> mismatch? Or is that transformer a cause of mismatch with coax fed
> antennas?
>>
>> Bad DowKeys is one reason I switched to a regular open frame relay ages 
>> ago
>> for my boat anchors. If the VSWR is high up on 10M its easy enough to 
>> tune
>> out with a compression trimmer at low power, measure and then replace 
>> with a
>> 1KV mica or disc for up to several hundred watts.
>
> I have stuff using ordinary clapper type relays up through 2 meters
> without problems.
>>
>> Carl
>> KM1H
>>
>
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
>
>