[DSP-10] DSP-10 with external Frequency Control

Thu, 28 Feb 2002 18:26:45 -0500

Hi, Doug!

Excellent question; I had wondered about doing the same thing.  It is
inconvenient here to make the change from the GPS-controlled external
oscillator (or the Rb oscillator) to internal frequency control, as with my
box I need to not only open the large outer Hammond box, but also open,
unscrew, and remove the copper circuit board homemade box housing the EZ-Kit
Lite to make this change.  And in the course of experimenting, I fairly
frequently want to make the switch.  So if you come up with a workable
'front panel switch' solution, please post the details to the list so we can
all implement it!

Thanks in advance, and

73,

Roger Rehr
W3SZ   FN20ah
2 Merrymount Road
Reading, PA  19609-1718
http://www.qsl.net/w3sz

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Doug Bade
> Sent: Thursday, February 28, 2002 9:02 AM
> To: [email protected]
> Subject: Re: [DSP-10] DSP-10 with external Frequency Control
>
>
>          This brings up a question I have been meaning to ask.. I
> externalized the 3 connections through rg174 for the 10mhz
> osc switching.
> When I jumper loopback external to send 10 mhz back in, the
> oscillator
> jumps 1.24 khz off freq due to loading changes of the
> oscillator with a 14"
> loop of coax more or less...External input works great, but
> cannot warp
> oscillator that far to get on freq.
>          Has anyone figured out a switch scheme to allow
> internal/external
> 10 mhz from the panel? I am considering a mosfet shunted
> across internal
> pair on board or similar schemes.. Anyone have a working plan???
> Doug KB8GVQ
>
>
> At 04:21 PM 2/27/02 -0800, you wrote:
> >Jimmy W7CQ and I made are first LHL7 Qs with 1 mw or less.
> >
> >We have both of our DSP-10s controlled by our external 10mhz - GPS
> >frequency standards. These standards use the Brooks Shera
> controller with
> >an HP 10544A crystal oven.
> >
> >If WX holds and I can get the antenna damage repaired this
> week end, after
> >our major wind storm here 3 weeks back, will be looking to
> try other weak
> >signal modes.
> >
> >73
> >
> >de KO7N   CN84ia
> >
> >Richard Ewing
> >PNW VHF Society C-075
> >http://home.teleport.com/~rewing
> >
> >
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>
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