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Author Topic: QUESTIONS ABOUT VFOs  (Read 6400 times)
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ve6pg
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« on: August 19, 2005, 09:36:00 PM »

..HI FROM TIM..BILL VE3LVL WAS ASKING ME ABOUT A STAND-ALONE,MORE STABLE VFO FOR HIS VIKING2. I THOUGHT I WOULD AS YOUR OPINIONS ON THE MATTER. IT WOULD BE NICE TO FIND SOMETHING LIKE A TMC VFO,BUT IN PLACE OF THAT,WHAT ARE YOUR THOUGHTS AS TO BILL USING HIS TS450,OR SOMETHING LIKE A DIGITAL SIGNAL GENERATOR?  ...TNX.. ..SK..
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...Yes, my name is Tim Smith...sk..
W1RKW
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« Reply #1 on: August 20, 2005, 12:48:31 PM »

I've used a homebrewed DDS generator on my Viking2. I noticed however the signal wasn't perfect so I filtered the output of the DDS generator and all worked well.  Very nice stable signal with good output.  I wasn't happy with using a digitally generated signal with a boatanchor so I stablized a Heath VF-1 I picked up for nothing and use that when I'm not using a crystal. 
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Bob
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Roy K8VWX
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« Reply #2 on: August 20, 2005, 03:47:07 PM »

         I have a VF1 here that someone had solidstated using a mpf 102 ( I might have the FET letters mixed up). I did not use the voltage divider network or power from a rig but used an 18 volt wall wart ( transformer ) with extra filtering and it works great. Max drift about 50 cycles. The dope on this was in an old QST but I don't know what year.I'm going to do another one just for the fun of it. Smiley 73
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W3DBB
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« Reply #3 on: August 20, 2005, 09:00:58 PM »

.
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Doug

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« Reply #4 on: August 21, 2005, 05:40:17 PM »

Write it up Roy. I have a lot of old VFO's that could use upgrades.
Keith
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WA1GFZ
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« Reply #5 on: August 21, 2005, 09:27:52 PM »

One of these nights when a slop bucket ticks me off I plan to try my HP3325
as a VFO (in slow sweep mode) the HP8640B would make a great VFO and test generator. 250 t0 500 MHz cavity oscillator with ECL dividers to get ranges down to 455 KHz. Very clean source!
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Glenn NY4NC
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« Reply #6 on: August 25, 2005, 04:28:55 PM »

I did the same thing to one of the Heath LMO's, just shoved the FET leads right into the correct tube socket contacts, applied +12vdc to the B+ input on the LMO and it worked great! very stable!! (but no glow  Grin)


         I have a VF1 here that someone had solidstated using a mpf 102 ( I might have the FET letters mixed up). I did not use the voltage divider network or power from a rig but used an 18 volt wall wart ( transformer ) with extra filtering and it works great. Max drift about 50 cycles. The dope on this was in an old QST but I don't know what year.I'm going to do another one just for the fun of it. Smiley 73
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