[HBR] Quartz Crystal Oscillator

[Shoppa, Tim]

I really doubt you'd be able to shift a 59 kHz crystal all the way to 50 kHz with a capacitor.

It depends on the cut of course but just for comparison: a 32kHz tuning fork crystal oscillator can be shifted up or down a few Hz with a capacitor.

OTOH you could probably repeak any 50kHz IF transformers for 59kHz just fine (maybe just maybe you'd take some turns off or tweak the built-in C's.)

For a 50kHz BFO that you'd want to be able to tweak up and down several kHz with the BFO knob, the LC tank is pretty ideal.

Tim N3QE

-----Original Message-----
From: hbr-bounces at mailman.qth.net [mailto:hbr-bounces at mailman.qth.net] On Behalf Of John Landrigan
Sent: Wednesday, August 03, 2011 2:38 PM
To: tetrode; HBR Reflector
Subject: [HBR] Quartz Crystal Oscillator

How practical is this device (Russian tube type quartz crystal oscillator) to use in place of a FT-243 quartz crystal as the second oscillator for a 50 KHz 2nd IF in an HBR styled receiver?
Ebay # 260829157003

I was hoping to procure a wiring diagram and then put a capacitor in series to adjust from the 59 KHz to the 50 KHz IF frequency.

John KA4RXP and Jody KG4VES


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