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Author Topic: HeathKit VF-1 VFO and Johnson Viking 2 wiring  (Read 1795 times)
KC4YOY
Member

Posts: 4




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« on: August 18, 2007, 01:13:14 PM »

Can anyone help me with the wiring mods needed to
use a HeathKit VF-1 VFO with my Viking 2 transmitter?
The VFO came to me wired for a Globe Scout.
I need to know what the wiring is for it to be powered by
the Viking.
Also the VF-1 has a plug for a crystal socket,
can I change it to a PL-259 to connect to the VFO
connection on the Viking which is a SO-239.

73, Ron

http://radioheaven.homestead.com/AMstation.html
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W5RKL
Member

Posts: 888




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« Reply #1 on: August 18, 2007, 02:10:23 PM »

A partial manual for the Heathkit VF-1 which includes the VF-1's schematic and alignment instructions, can be downloaded at the following url:

http://bama.edebris.com/manuals/heath/vf-1/

click on the VF-1's PDF file.

Yes, it appears you can subsitution an SO-239 in place of the crystal stocket. Whether the 47K ohm resistor as shown in the VF-1 schematic is required by the Viking or not, you may have to experiment with and without it.

I would review the Viking's manual to determine what connections are required. At a minimum the VF-1 requires 6.3VAC/DC at 450ma and 250 to 350VDC at 20 to 25ma for the plate.

73's
Mike W5RKL
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W5RKL
Member

Posts: 888




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« Reply #2 on: August 18, 2007, 02:14:59 PM »

I forgot the mention this.

The VF-1's octical plug has the following voltage pins

1. Ground
2. 6.3VAC filament
4. 250 to 350VDC at 20 to 25 ma

The other pins are for the Heathkit AT-1 and may not be required by the Viking.

73's
Mike W5RKL
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W4CSM
Member

Posts: 1




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« Reply #3 on: September 30, 2007, 03:47:40 PM »

I built a Heath VFO to use with my AT-1 in the 50's and as I recall the thing simply plugged into the crystal socket. I also had a Viking II and I think the same crystals would work both the V-II and the AT-1. It has been a long time, but would that not be a clue to how one would make the VF-1 work with the Viking II? Looks like it might be "plug and play". I have a manual on the VF-1. If there is anything in it that would be of help to you, just send me an e-mail.

Regards,

Henry Milner
milav@alltel.net
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AC0FA
Member

Posts: 298




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« Reply #4 on: December 14, 2007, 06:50:16 PM »

If a dc path exists in the vfo output. It is necessary to isolate the viking II 6au6 oscilator grid with a blocking capacitor of 50 to 150 mmf. In the connection between the viking II and the vfo.
From the viking II manual.    
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