Heathkit AT-1 with VF-1 - BoatAnchors Forum at eHam.net

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eHam.net Forum : BoatAnchors : Heathkit AT-1 with VF-1

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Heathkit AT-1 with VF-1	Reply
by KB1LXF on October 21, 2009	Mail this to a friend!
Good morning all. I recently picked up a Heathkit VF-1 to attach to an AT-1. However, I got a question. In the VF-1 manual, it states that I need to put a connector between D5 and TB3 "In the event that both stages of the AT-1 are to be keyed". I don't know if I want both stages to be keyed. Can someone give me an explanation of this or direct me to something to read which might help me understand this concept? Thanks, Marc

RE: Heathkit AT-1 with VF-1	Reply
by K0WA on October 21, 2009	Mail this to a friend!
From my experience with a VF-1 and a DX-40..... The VF-1 has a tendency to chirp on CW. Voltage regulation is critical on the screen...and I even added voltage regulation on the plate on mine. Another way to stop the chirp is to allow the VF-1 to run continuously when transmitting. Key it all the time and then key the Xmitter to transmit. By doing it that way, the VF-1 will settle down in a second or two and then you can have a no chirp signal on the air. I used some relays to accomplish all this. Another factor of chirp is the tube. It has been my experience that the tube could be bad and cause chirp. Not all tubes are created equal and some did better than others. Also, I changed some of the caps in the oscillator circuit to a better grade. That helped also. Another trick I tried...and I am not sure it really worked...I put in new resistors and doubled the wattage so they would not generate a lot of heat thus making the VFO more stable. At least, that was my thinking back then. Lee - K0WA

RE: Heathkit AT-1 with VF-1	Reply
by KE3WD on October 21, 2009	Mail this to a friend!
You are correct not to be sure. The resistors would still generate the same amount of heat regardless of their wattage rating. The heat is the product of Volts and Amps applied.

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