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LF: AW: VFO for VLF receiver? Digital type pre-mixer, any ideas?

To: [email protected]
Subject: LF: AW: VFO for VLF receiver? Digital type pre-mixer, any ideas?
From: [email protected]
Date: Fri, 24 Jan 2003 11:37:11 +0100
Reply-to: [email protected]
Sender: <[email protected]>
Hi
yes, any ideas, please look at www.mvnet.de/priv/vw/index~1.htm

I will write any schematics and programs thes evening and on the weekend
01.Feb  to the homepage

73 Eberhard
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]]
Gesendet: Mittwoch, 22. Januar 2003 18:03
An: [email protected]
Betreff: LF: VFO for VLF receiver? Digital type pre-mixer, any ideas?


Hi

planning to build a VFO for a boatanchor VLF receiver covering 50-140KHz, first IF is 169kHz and it was originally using xtal control. The VFO must
cover 220-310kHz.

The variation needs to 85kHz, and it seems easier to make a VFO above 1MHz, possibly Clapp oscillator (my favourite since everybody else disregard it!),
might also try the Seiler.

I thought of using a 2457.6MHz xtal and mix with VFO (ca 2MHz), and divide
the output
by two or more. Suppose I could use an FF, preferably CD4013 for the mixer.

But I can't find any reference to similar constructions, only have a vague
memory that it has been mentioned in TT some time in the last 35 years

Wonder if somebody else have some experience in this, and will the mixer
divide
or just mix?

960kHz resonators are also readily available, but they won't pull much.

73
Jan-Martin

---
J M Nøding, Datakvalitet, TTS, Kristiansand
Telefon 0047-380-52660, 9077-7126 (QTH: 0047-380-87178)



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