Re: 9 MHz Crystal in a TR-4
|
Glad it worked for you Barry!? It¡¯s an old trick and a lot less expensive than a new crystal!
?
73, Clint, VE3CMQ
?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]>
On Behalf Of n4buq via groups.io
Sent: Wednesday, 23 April 2025 18:13
To: DRAKE-RADIO <[email protected]>
Subject: Re: [DRAKE-RADIO] 9 MHz Crystal in a TR-4
?
Great call!? I happened to have a 2pF SM and I placed it across the existing variable cap.? I now can get 9.000000 MHz with about 1kHz swing on either side.? The two sidebands now
sound just like they should.? I can get a zero-beat on both sides with almost exactly the same frequency response as I tune through the calibrator signal and switch sidebands.? Very nice to have this working!
?
?
I'd try just adding a small cap across the xtal or from xtal to ground, or across the trimmer.
280Hz isn't far, I'd try 5-10pf maybe.
?
|
