[Heathkit] DX-20 T/R Switching?

[Carl]

I started out with a HB 4 tube regen in 1955 so the seperate RX antenna was 
just a 30' wire about 10' high from the eaves to a back tree; the 80/40 TX 
antennas were RG-58 coax fed dipoles. Next up was a bandspreaded BC-454 and 
455 using the same wire. When I got a used HQ-129X I also had saved enough 
$$ for a Dow Key Relay. I didnt have a commercial TX until I got the General 
and that was a DX-100 I built which I hated and replaced with a used Viking 
I and 122 VFO.

That regen was sure sensitive, even on AM. As a SWL I got cards from the 
West Coast, Australia, Canal Zone and many others on 10M from NYC/LI.  I 
learned CW on it but the selectivity was horrible altho better than a 
friends S-38D it seemed.

Carl
KM1H

----- Original Message ----- 
From: "Donald Spoon" <drspoon at sbcglobal.net>
To: "Curt" <rhulett1 at comcast.net>; "Heathkit" <heathkit at mailman.qth.net>
Sent: Wednesday, August 25, 2010 3:35 PM
Subject: Re: [Heathkit] DX-20 T/R Switching?


> Curt,
>
> When I owned an AT-1 I used a knife switch for the antenna switching!
> When it come time to transmit, I threw the knife switch and turned on
> the HV and started keying.  Receive was the reverse.  If you had the
> oscillator keyed also, you could leave the HV on if you were careful not
> to key the transmitter when listening.  Of course, I was about 14 years
> old and very much a novice, but it worked for me!  I also was "filthy
> poor" and couldn't even dream of T/R switching...  The AT-1 was
> purchased via earnings from a Paper route over about 6 months.
>
> I seem to recall a powered T/R switch that would ground the Receiver
> antenna lead when it sensed transmitter power.  That seemed to work
> well, but I never owned one.  Things have changed...
>
> Cheers,
> -Don Spoon-
>
> Curt wrote:
>> I built a relay box to switch antenna between transmit and receive for a
>> recently acquired DX-40.
>> Contemplating acquiring a DX-20, was surprised to notice it has no 
>> provision
>> for providing switched power
>> for a relay.  Never having owned any Heathkit transmitter in my old 
>> Novice
>> days, am wondering how folks
>> performed T/R switching with the DX-20 or AT-1?
>>
>> 73, Curt KB5JO
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>
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