Heathkit AT-1 - BoatAnchors Forum at eHam.net

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eHam.net Forum : BoatAnchors : Heathkit AT-1

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Heathkit AT-1	Reply
by LLEWELLYN7070 on October 28, 2009	Mail this to a friend!
I recently acquired a Heathkit AT-1 w/ a VF-1 VFO. My question is what is the output of the transmitter on 40M? Should I see a difference between a crystal and using the VFO? Any help is appreciated. Thanks. -Bill- (working on my ticket!)

RE: Heathkit AT-1	Reply
by KA5N on October 29, 2009	Mail this to a friend!
A working AT-1 should give around 15 to 20 watts output. The power output is not related to whether a VFO or crystal is used for frequency selection. Before you ask there is no simple way to increase the power output. The AT-1 is a good beginners radio and should not be modified. In comming years a good restoration will be worth more and more. Allen

RE: Heathkit AT-1	Reply
by LLEWELLYN7070 on October 30, 2009	Mail this to a friend!
Allen Sorry for being a such a moron concerning the AT-1 xtal v VFO question. I have a very nice AT-1 and VF-1. I replaced a few parts in the AT-1 (caps and resistors) but it is pretty much stock. My add was an AC lamp. I certainly do not want to increase the output. It's a great entry-level transmitter and I have no intentions in augmenting the output. Thanks for the note. -Bill-

RE: Heathkit AT-1	Reply
by N2EY on November 17, 2009	Mail this to a friend!
The output of a stock AT-1 is only about 9 watts on 80, 40 and 20 meters into a 50 ohm load. There are two reasons for this: 1) The rig has fixed output links with no means of adjusting the loading 2) The rig operates the 6L6 final as a doubler on all bands except 80. There's a good article about the AT-1 in QST for October, 1955. 73 de Jim, N2EY

RE: Heathkit AT-1	Reply
by W8JI on November 18, 2009	Mail this to a friend!
The VF1, because it has no output buffer stage, often it a bit short on excitation. It also pulls frequency a bit from the external load. The VF1 is only a simple single stage pentode that is a standard Clapp oscillator with the output taken from the plate. It also output 1.750 to 2 MHz when on 80, so the input stage of the radio has to act as a doubler. Don't be surprised if it reduces the output quite a bit! I had to build a buffer into my VF1's. Tom

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