[Collins] 32V-1

[Roger Shultz]

More than likely, when it didn't energize, TX power was of course present on
the transmit side of the relay. 

Because the relay did not switch, then the shorting mechanism on the receive
side didn't work allowing excessive coupled transmit power to get to the
receiver front end.

73, Roger, NJ2R

-----Original Message-----
From: collins-bounces at mailman.qth.net
[mailto:collins-bounces at mailman.qth.net] On Behalf Of Sheldon Daitch
Sent: Monday, December 17, 2007 9:50 AM
To: Jim Brannigan
Cc: collins at mailman.qth.net; geraldj at storm.weather.net
Subject: Re: [Collins] 32V-1

I suppose depending on the failure mode of the relay, it could
have connected the TX to RX terminal. 

How?

Real mechanical failure due to the breakage of moving parts
inside the relay.

I know we generally think of relay failure as coil related,
but other parts of the relay can break and short the poles
in ways a normally operating relay cannot connect.

73
Sheldon


Jim Brannigan wrote:

> If the relay failed to energize, how did the TX terminal connect to 
> the RX terminal?  At worst the TX would transmit into an open load...
>
> Jim
>
>
>> The 75A1 uses a common input transformer/coil on all bands. The 
>> secondary is fed to the individual band coils.
>>
>> Bad DowKeys is one reason I switched to a regular open frame relay 
>> ages ago for my boatanchors. 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.
>>
>> Carl
>> KM1H
>>
>>
>>
>
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