Excellent job. The relay is certainly an effective way to protect that switch.
However ...
A simple power strip with enough outlets for a single station solves the AC switch problem. The key
is to switch the equipment on -OR- off _only_ when the power strip switch is OFF.
None of our boatanchor equipment has an easily power switch, most are on the back of a
potentiometer. I don't use ANY boatanchor power switches 'hot' any more.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Kris Merschrod wrote:
Mark, that is a nice description of the AC-4 rebuild. Thank you for sharing
it with us.
I have done a few of them but using Mike's (Solar) approach. I confess that I did not strip it
all down and scrube the chassis! Very good idea to use new bushing etc.
I have gambled on the old switches holding out - so far so good.
Kris KM2KM
----- Original Message ----- From: "Mark Pilant" <[email protected]>
To: "drakelist" <[email protected]>
Sent: Sunday, January 08, 2012 11:05 AM
Subject: Re: [Drakelist] Yet another AC-4 rebuild (now :-) completed
OK, now the rebuild is really complete. Yesterday I added the relay
to take the load off the On/Off switch. Here are pictures and a
description of what I did:
http://www.n1vqw.net/ac4rebuild/#phase2
Before the addition of the relay, I measured a current draw of about
325 mA with the power supply unloaded. This would also be the current
on the On/Off switch contacts. Since this was on an unloaded power
supply, I would expect this to rise when transmitting.
After the addition of the relay, this current (from the relay coil)
seen by the switch contacts dropped to just a bit over 10 mA. This is
a substantial drop, and should make the switch contacts last much
longer.
Oh yes, comments, corrections, and suggestions welcome.
73
- Mark N1VQW
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