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

Fri, 01 Mar 2002 10:55:07 -0500

Correction below...
re-sent due to mail send problem...

>I guess I should have said more specifically, automatic preferred, and 
>switched somehow if necessary. The current scheme requires moving a shunt 
>on the header or replacing shunt with external connection... We wish to 
>simplify this design. Just running a coax loop out and back in causes freq 
>change to the lo of about 1.5 kHz.. way too much to compensate.. That is 
>the agenda.. Thanks, Doug
>

>At 10:45 AM 3/1/02 -0500, you wrote:
>
>>>         Here is page 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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