[Lowfer] LOWFER receiver conundrum.

[Michael Sapp]

Ben: A basic GPS disciplined oscillator is shown here.... 
http://gpsdo.i2phd.com/

73, Mike wa3tts

----- Original Message ----- 
From: "Ben Hall" <kd5byb at gmail.com>
To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands" 
<lowfer at mailman.qth.net>
Sent: Tuesday, January 06, 2015 6:01 PM
Subject: [Lowfer] LOWFER receiver conundrum.


> Good evening all,
>
> I've been using my Elecraft KX3 with a Jackson Harbor Press upconverter to 
> monitor LOWFERs.
>
> The combination of the KX3 plus the converter has some drift.  I'm not 
> sure if it is the KX3 or the converter.
>
> But...being that I like to build stuff...I figured I'd build an 
> OCXO-driven AMRAD converter similar to those built by Todd Roberts, 
> WD4NGG.  I even found a very similar 3 MHz OCXO on the e-place.  :)
>
> So...the Todd Roberts design upconverter will eliminate the converter as a 
> possible source of the drift.  But...now what do I do about the KX3?
>
> So I started pondering a SoftRock SDR-type receiver with the clock source 
> being either the 3 MHz OCXO above or my 10 MHz HP Z3801.  (GPS disciplined 
> oscillator)
>
> In both cases, using a simple prescaler or ripple counter frequency 
> divider cannot cover all LOWER and other frequencies of interest.  (SAQ, 
> 135 to 138 kHz, 160 to 109 kHz, 472 to 510 kHz, etc.)
>
> So here's the question...there are plenty of articles online using a 
> reference oscillator and PLL to generate a *higher* frequency than the 
> reference.  (IE:  the microwave folks generating multiple GHz frequencies 
> from 10 MHz)  But...I've yet to find anything about using a PLL and 
> reference oscillator to generate a frequency *lower* than the reference 
> oscillator.
>
> I know some folks here with transmitters have locked them to either an 
> OCXO or GPS.  Can someone point me to an article on how this is done?
>
> thanks much and 73,
> ben
>
>
>
> ______________________________________________________________
> Lowfer mailing list
> Home: http://mailman.qth.net/mailman/listinfo/lowfer
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Lowfer at mailman.qth.net
> Post must be less than 50KB total for message plus attachment!
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html