BC-610 I, TRANSMITTER

AN/GRC-26

 





BC-610
I got this BC-610 a few days ago. I got first all the tubes and cables.
Two days later I got the rest. I don’t understand what I got before I start the work with all the parts home.

I found this movie on the internet.
This film showed me how to build the transmitter of the parts I got.
Later I got the complete AN/GRC-26 book.

This is a 400 Watt CW, AM and RTTY amateur radio transmitter designed in 1938.
It was improved in 1942 for use in war. Watch the video.

 



http://www.archive.org/details/VoiceofV1944


http://www.archive.org/details/VoiceofV1944_2


http://www.archive.org/details/VoiceofV1944

http://www.archive.org/details/VoiceofV1944_2



My BC610 is now ready for use.





I have here started testing the transmitter.
To the right we have BC614 microphone amplifier and O-39B/TRF-7 external oscillator.





I have here started testing the transmitter.




My BC610 is operated at full power for the first time.
The anode of the 250TH is red.
Problems with the arcing in my antenna tuner because of the high power.
I have to either design a new antenna tuner or create a new antenna that requires a lower voltage.

 


PARTS I HAVE RECEIVED FROM A STORAGE IN AN OLD BARN.




Front panel





RF deck, Modulator, Power supply.





Transmitter - oscillator, driver and PA.





Have here mounted the tubes and tests here oscillator and driver stage.





Oscillator 6V6, Dubler 6L6, Driver 2x 207 and PA 250TH




Have here started to assemble the parts.
At the top is the 400 watts audio amplifier .
Driver stage is 2x 2A3 in push-pull.
PA is 2x 100TH.






Here's transmitter assembled





Testing the BC-610 heating voltage. Normal photo.





Testing the BC-610 heating voltage. HDR photo.



----

The BC-610 is very heavy, so I mount wheels on it.





AN/GRC-26 microphone amplifier, BC-614.
I have also NOS tubes for the transmitter.





Inside the BC-614 microphone amplifier.
The 6SN7 are used for the amplifier tube.





AN/GRC-26 VFO, O-39B/TRF-7










Here is the oscillator LC circuit in a thermostat controlled chamber.




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