1g-102 rf generator

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1g-102 rf generator

Post by CHUCKSUE on Mon Jan 19, 2015 5:27 pm

I built the demodulator probe and placed it between the generator and the scope.It cleaned up the signal and I could see a good sign wave. When I turn the variable capacitor I see no change in the frequency. The output for the af 400 hz is ok. Can anyone lead me in the rifgt direction to repair this thing???

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Re: 1g-102 rf generator

Post by 75X11 on Mon Jan 19, 2015 7:14 pm

Is this what you are asking about?

http://www.heathkit.nu/heathkit_nu_IG-102.html

Just to help identify it.
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1g-102

Post by CHUCKSUE on Tue Jan 20, 2015 1:58 pm

Yes that is the one. I have checked all the resistors and they are good. The schematic you have shows the plate resistor 4.7k and that is what is in the circuit. My schematic shows a 10 k. I don't think that is the problem.

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Re: 1g-102 rf generator

Post by 75X11 on Tue Jan 20, 2015 2:03 pm

Hopefully someone familiar with the unit will chime in.
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Re: 1g-102 rf generator

Post by CHUCKSUE on Tue Jan 20, 2015 2:21 pm

I will keep an eye on the posts. Thanks a lot.

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RF generator

Post by CHUCKSUE on Mon Jan 26, 2015 10:54 am

I read up on how to read freq. on the scope. With the scope set at 1micro sec. ch1 , 20 mil. Volts
RF generator set at band A , Coarse attenuator at high, FR attenuator at high.
Pointer at 10, I see one cycle
Pointer at 20, I see two cycles
Pointer at 30, I see three cycles.
When I turn the variable attenuator down at one point I lose the signal.

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Re: 1g-102 rf generator

Post by Ragwire on Mon Jan 26, 2015 7:40 pm

I don't quite understand what you are trying to describe with what seems like as few words as possible. I am inferring though, that you are expecting the audio output of the IG-102 to change with the dial setting? It won't. Only the RF will, but the modulation that you would see on the scope with a demodulator probe should remain a 400 Hz sine wave, whatever the RF carrier frequency you set.
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rf generator

Post by CHUCKSUE on Tue Jan 27, 2015 11:51 am

The wave form I see is a good sign wave,but it changes as I turn the variable capacitor to the settings of 10,20,30. I connected my fluke 79 and checked the frequency and it is 357 hz. It should be 400. It reads the same with the scope connected. All this I did without the demodulation probe. I checked the out put for the RF using a radio and finding the zero beat. I have the construction manual and I followed the calibration section. They all were good except the f band. I question my work. I only hear the hz at one place on the dial. If I understood the manual correctly I should hear it across the band.

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