I am also using HC1s and RJ1As for a line-in relay of my amp.
I am not using it for full break-in but it is working so reliable,
without any trouble for many years.
a few points:
1. Whatever relay you use make a sequence for coils of line-in
or antenna-relays are being switched as fast as your transceivers
(exciters or drivers) are turned to transmit; and then release a block
bias of your amp.
Before employing vacuum relays I have used a small coaxial relay
for many years with no failure, excluding a melt-down of its center-
pin of N-connector because of an old and loosen male connector.
2. Check specs of relays. Many vacuum relays are specified for
switching of a continuous (DC/RF) current. RJ1A is seemingly small in
its spec at high-frequency, but it is enough sustainable with a sequence
above. To achieve this I am using a 100-200 ms delay relay inside my amp.
3. If you require a full break-in and a reliability you should observe
their switching capabilities of continuous current at the frequency.
Please note that my point of view is a home brewer of linear amps.
de Han JE1BMJ
----- Original Message -----
From: "Mike Bondarev" <firstname.lastname@example.org>
To: "'Amps'" <Amps@contesting.com>
Sent: Monday, March 31, 2008 4:51 AM
Subject: Re: [Amps] Relays
> Hi group!
> I use RJ1A in my home made PA with GU-84B with 2+ KW out and I don't
> have had any fault since I start to use this amp more then one year ago.
> I don't use full QSK but only semi bk-in. I think The Tetrode Boards by
> GM3SEK is help a lot against relay fault.
> BTW you can see my article with lot of photos about my amp on my web
> page. It's in Russian, but one of the web translator will help.
> Regards, Mike RL3BM
> See you in Dayton!
> Amps mailing list
Amps mailing list