I am building a circa 1953 AM Modulator to go along with my 6146B that I had posted
questions about earlier.
I think that it's working fairly well, judging by my power meter and scope trace display. I have
yet to make a QSO or to get on the air yet (I've just got it operating today). I have the modulator
connected to my 6146B transmitter and am measuring about 60 Watts output.
(The modulator is connected to both the Plate Supply to the 6146B and Screen of the 6146B
via a "dropping" resistor.)
One concern that I have; The B+ in the construction article is stated to be around 600VDC,
but my power supply is about 80VDC higher. I was thinking that perhaps I should have increased
the battery bias supply, but it seems to be working well as it is.
There is a 50 Ohm cathode resistor included in the design that allows the operator to monitor
the cathode current (but I have yet to do so).
Anyway, here are some images. I am curious to see what others think of this design :-)http://www.bignick.net/Mod/before.jpghttp://www.bignick.net/Mod/rear_1.jpghttp://www.bignick.net/Mod/under.jpghttp://www.bignick.net/Mod/Temp_Front.jpghttp://www.bignick.net/Mod/front_cab.jpghttp://www.bignick.net/Mod/rear_cab.jpghttp://www.bignick.net/Mod/top_cab.jpg
Schematic wiring diagram:http://www.bignick.net/Mod/Mod_2.jpg