[Milsurplus] MAK Transmitter osc

[hwhall at compuserve.com]

<ahem> Brilliant!!!

WayneWB4OGM

-----Original Message-----
From: B. Smith <smithab11 at comcast.net>
To: milsurplus <milsurplus at mailman.qth.net>
Sent: Mon, Feb 17, 2020 8:17 pm
Subject: Re: [Milsurplus] MAK Transmitter osc

  And anytime you are experimenting with feedback on a crystal oscillator you might be playing "Crystal Roulette" A simple crystal current checker can be fabricated. I usually use a 30-40 ma bulb and prefer that it not glow at all in the circuit. Those Chinese crystals may not survive in high current 30-40 ma circuits. 
 73 k4che
 
 
 On 2/17/2020 6:08 PM, David Stinson wrote:
  
Ken's suggestion is a good one, but don't "go overboard." 
 This kind of feedback directly increases crystal current. 
 "A little dab will do ya..." 
 
 On 2/17/2020 5:05 PM, Kenneth G. Gordon wrote: 
 
Ray: 
 Viewing the schematic, the plate output tuning network provides the phase-shift necessary 
 to sustain oscillations, IFF the crystal is very active. The capacitor at the bottom of the plate 
 tuning network is connected to the cathode, then cathode being the "common" between the 
 grid and the plate. 
 
 If that was my rig, I would simply connect a SMALL capacitance, a "gimmick" capacitor, 
 directly from the plate to the grid 
 
 You won't need much. 1 to 2 pfd and not more than, say, 5 pfd, should be enough to get any 
 crystal working. 
 
 
 ______________________________________________________________ 
 Milsurplus mailing list 
 Home: http://mailman.qth.net/mailman/listinfo/milsurplus 
 Help: http://mailman.qth.net/mmfaq.htm 
 Post: mailto:Milsurplus at mailman.qth.net 
 
 This list hosted by: http://www.qsl.net 
 Please help support this email list: http://www.qsl.net/donate.html 
 Message delivered to smithab11 at comcast.net 
 
 
 
 ______________________________________________________________
Milsurplus mailing list
Home: http://mailman.qth.net/mailman/listinfo/milsurplus
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Milsurplus at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to hwhall at compuserve.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20200218/5a7535a0/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: blmpoghkdjekdgjn.jpg
Type: image/jpeg
Size: 56572 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20200218/5a7535a0/attachment-0001.jpg>