[NJARC] Hallicrafters & Dow Key Relays

[Mike Feher]

Scott -

You have a nice device. It will allow QSK operation with no problems. The
relay will handle the power. In the mid to late 8O's I used to use a HT33B
as an amplifier with a solid state receiver (Cubic 102BXA). I put in a solid
state QSK T/R switching arrangement consisting of a single FET. It had no
problem handling the power of the HT-33B. It was better than any relay, as
it had an unnoticeable dead time between keying and listening. However your
Dow-Key should be close in performance. The circuit I used, I cannot claim
credit for, as it came out of "Ham Radio" near that time. 73 - Mike 

 
 
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
 
 
-----Original Message-----
From: njarc-bounces at mailman.qth.net [mailto:njarc-bounces at mailman.qth.net]
On Behalf Of Scott Roberts
Sent: Thursday, January 01, 2009 4:17 PM
To: HallicraftersRadios at yahoogroups.com; NJARC Radio Club
Subject: [NJARC] Hallicrafters & Dow Key Relays

Visit our web site - See http://www.njarc.org
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Hi, and Happy New Year!
I have a question regarding Dow Key Relays, for TX/RX antenna switching. Mt
HT-37 and HT-41 manuals both say to use a Dow Key relay or switch for the
antenna lead, to trigger when transmitting.

Recently I picked one up, an older model without the solenoid, but with a
tube instead... It his a Dow-Key Co. Model DKC-TRM-1, using a 6EH5 tube.(I
can use a 12EH5 for 12 vt heater operation) Its operating range is from 1.8
to 30 MC. 

I do have a copy of the installation instructions for this one, so I know
how to hook it up. What I am not sure of is this- will it handle the output
of either the HT-37 or the HT-41(100 or 1500 watts, respectively) with no
problems?

Thanks!
73,
Scott
KC2TYV
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