[heathkit] drifting and jumping and chirping etc;;;;;;

["Jon Aussey" <j.aussey@cox.net>]

Hi Bob,

 

So far, all the suggestion have sounded excellent and I have nothing to add .  Maybe the schematic will enable Alan to get the “middle age” and rather creaky VFO to work correctly and we can put this problem to bed.  Working with old technology is exciting but can give you some strange indications.  I put a Heath kit VTVM together when I was going to college and have been tinkering with restoring the old kits every since.  As a retired engineer, it keeps my brain neurons firing and also keeps me going.  I hope you can solve your problem.- good luck on your troubleshooting effors!

 

 Jon

KI4WIV

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From: heathkit-owner@cyberventure.com [mailto:heathkit-owner@cyberventure.com] On Behalf Of G3OOU@aol.com
Sent: Monday, June 02, 2008 6:07 PM
To: heathkit List Member
Subject: [heathkit] drifting and jumping and chirping etc;;;;;;

 

Hi Alan

 

I can send you the circuit that I have used in the past if that would help? I implemented Spot by opening the negative bias feed to the VFO but it depends how much signal from the VFO leaks through the rest of the Tx circuits to the Rx. In my early rig I used a cathode follower electronic TR switch rather than a relay and could hear the VFO without the rest of the TX being used. The VFO was followed by an unkeyed low power class A amplifier to provide isolation from the following multipliers.

 

I think that this forum does not allow attachments so it will have to be direct to your own email address or uploaded to the forum area.

 

73

Bob
G3OOU
G-QRP 6907
http://members.aol.com/rfcburns