Fwd: RE: [DSP-10] DSP-10 with external Frequency Control

Fri, 01 Mar 2002 10:45:46 -0500

>Date: Fri, 01 Mar 2002 10:44:41 -0500
>To: From: "H.G." <[email protected]>
>From: Doug Bade <[email protected]>
>Subject: RE: [DSP-10] DSP-10 with external Frequency Control
>
>         Here is pager 7 of the schematic. The 10 mhz oscillator is where 
> we are talking about. It has an internal and external connection across 
> the header...
>We want to be able to run on board when it can, and the inject external 
>for higher stab when available.. Let us know, Doug
>
>
>
>At 09:30 AM 3/1/02 -0600, you wrote:
>>If one of you guys can send to me the schematic and what you desire to do, I
>>will be happy to design the circuit you need.
>>
>>I am an Electronic Design Engineer in areas of R.F. ( from low to Ghz ), as
>>well as DC Circuits and power supplies.
>>
>>Regards
>>
>>Nando KC5FDW
>>
>>-----Original Message-----
>>From: [email protected]
>>[mailto:[email protected]]On Behalf Of Doug Bade
>>Sent: Friday, March 01, 2002 9:20 AM
>>To: [email protected]
>>Subject: RE: [DSP-10] DSP-10 with external Frequency Control
>>
>>
>>          A company I worked  for (20 years ago)  had a 60 hz oscillator on
>>a board and would sync it with line freq when it was available. As I recall
>>it was a NAND gate with a pullup on the line side inserted in the loop. I
>>am trying to rationalize if this approach would work. What I am envisioning
>>is coupling the lo on the board a little looser, and if you feed an
>>external 10 mhz in, it would tickle the oscillator and drag it on freq. I
>>tried the direct approach by connecting both at once at the header and I
>>got harmonics and 2 oscillations instead of 1 steady... I was considering
>>too a series resistor in the header loop which may allow the xtal
>>oscillator to bend a little easier...
>>
>>          Any engineering thoughts would be appreciated..
>>
>>          At last case, we could use a 4053 cmos switch and just switch with
>>a toggle switch. to manual for my likes...but it should work..Doug KB8GVQ
>>
>>
>>At 06:26 PM 2/28/02 -0500, you wrote:
>> >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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