[Hammarlund] SP-600 Electronic Dial

[Jerry]

The DD-103 from USP works perfectly with my SP-600.  Just slide the tube 
shield interface onto the 6C4, do a little programing in the unit and 
you're good to go.
Jerry
K7LY

On 2/24/2011 3:19 PM, Les Locklear wrote:
> Miles and Group,
>
> I used one from Electronic Speciality Products :
> http://www.electronicspecialtyproducts.com/index.html
>
> The John R. Leary SP-600 I have has an rca jack by the hf oscillator
> tube (6C4), it worked, but the readout was about 70 kc low on the SP-600
> dial, there was a capacitance problem, I never pulled the rf deck cover
> to try different caps to correct it. There are other methods to connect
> it, such as the tuning cap, but I didn't try those methods. I did have
> one of their other dials in place of where the clock goes on a HQ-180A
> and it worked superbly. YMMV
>
> Les
> ----- Original Message -----
> From: "k2cby"<k2cby at optonline.net>
> To:<hammarlund at mailman.qth.net>
> Sent: Thursday, February 24, 2011 1:07 PM
> Subject: [Hammarlund] SP-600 Electronic Dial
>
>
>> Has anybody tried to couple a digital counter to an SP-600 to make a
>> digital
>> dial?
>>
>> I've tried a couple of methods and none seems to work very well.
>>
>> I have had passable results on the lower three bands (below 7 MHz) by
>> tapping off the feed
>> from the HFO to the crystal oscillator switch through a 50 pF
>> capacitor,
>> although the
>> HFO signal is full of harmonics.
>>
>> If I try this on the bands above 7MHz the HFO gets pulled to far off
>> frequency (even with the
>> coupling reduced to 10 pF) I can't even align the receiver. (The
>> trimmer is
>> too small.) The only
>> solution I've found is to wind a multi-turn coil around the 6C4 HFO
>> tube.
>> The signal is strong
>> and the waveform looks real good, but it's quite a kluge.
>>
>>
>>
>> Miles B. Anderson, K2CBY
>> 16 Round Pond Lane
>> Sag Harbor, NY 11963
>> Tel.: (631) 725-4400
>>
>> Fax.: (631) 725-2223
>> e-mail: k2cby at optonline.net
>>
>> ______________________________________________________________
>> Hammarlund mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/hammarlund
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Hammarlund at mailman.qth.net
>>
>> List Administrator: Duane Fischer, W8DBF
>> ** For Assistance: dfischer at usol.com **
>>
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Hammarlund mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hammarlund
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Hammarlund at mailman.qth.net
>
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com **
>
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>