[ARC5] Backwave

[Jay Coward]

Hello Everyone,
 I always thought back EMF diodes were wired across the coil, not in series. Maybe at +28V it doesn't matter?
 Jay KE6PPF
 
 
-----Original Message-----
From: Michael Hanz <aaf-radio-1 at aafradio.org>
To: J Mcvey <ac2eu at yahoo.com>; kgordon2006 <kgordon2006 at frontier.com>; arc5 <arc5 at mailman.qth.net>
Sent: Mon, Oct 26, 2015 12:32 pm
Subject: Re: [ARC5] Backwave


On 10/26/2015 11:57 AM, J Mcvey via ARC5 wrote:
> The antenna select makes a
fairly loud "clunk" when selected. The cathode select relay is quiet compared to
that.
> When keying the system as it was originally designed , the osc, screen,
and plate B+ are "hot keyed" simultaneously  via the modulator keying relay.the
antenna switch relay is also heard at the same time. I can definitely hear them,
but they are not objectionably loud. I get chirp, but no backwave. The chirp
appears to be function of loading/current and the power supply
stability.

There is an element of relay coil interaction as well, Jim.  See

http://aafradio.org/docs/Relay_timing_issues_-_SCR-274N.html for an

exploration of the subject.

73,
Mike 
KC4TOS

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