Take a look at the bandswitch solution used by
SM7DLK http://www.qsl.net/sm7dlk/slutsteg.htm at
about the middle of the page.
It was patterned after a concept used in Marconi 10 kW
manually tuned amplifiers and worked well in either case.
73/
Karl-Arne
SM0AOM
----- Original Message -----
From: "Robert Morris" <robrk@nidhog.net>
To: <amps@contesting.com>
Sent: Saturday, September 11, 2010 11:05 PM
Subject: Re: [Amps] Autotune amplifier. How to implement actuator / system
for tank switching?
On 9/11/10 4:42 PM, Paul Decker wrote:
>
>
> You might also take a look at the URT-23 system specifically the AM-3924
> amplifier, it's an auto tune system and uses a matrix of relays to bring
> in L and C for the tank circuit. The manuals and schematics are very
> detailed and should provide some interesting ideas.
>
I made mention of this a month ago on a similar thread. I have a 1976
vintage
Motorola manual of an 8877 HF amp using smallish, open frame relays to
switch
the taps on a PiL coil. Tried to get someone with a bigger brain to do the
math
of voltages and current to be expected, with no takers.
In a dim photograph, the relays don't look to be more than what many are
using
in remote antenna or four square boxes.
They say "modified". thinking they put straps across the contacts of a DPDT
relay.
--
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
--------------------------------------------------------------------------------
No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.851 / Virus Database: 271.1.1/3128 - Release Date: 09/11/10
08:34:00
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|