series or other modulation types
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| Nov 7th 2015, 21:16 | |
M0ELSTotal Topics: 0 Total Posts: 0 |
I have an old "chatterbox transceiver" solid state and am looking for advice on how to connect an AM modulator to the small amp pcb with 20w output. The am uses a pair of RD15HVF1 devices. I was think along the lines of using a small audio transformer with a centre tap secondary connected to the supply voltage and the other end "floating". The centre tap will connect to the modulator cao an electrolytic cap. The primary side connects to the mic and gnd. Has anyone got any tips or ideas on other types of ways of getting AM audio into these devices. 73 John |
| Nov 9th 2015, 18:41 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
The modulation signal adds and subtracts with the supply voltage--you typically need to replace the 12 volt devices with 24 volt ones to handle the added voltage stress created by the modulation signal. Zack W1VT ARRL Senior Lab Engineer |
| Nov 26th 2015, 20:38 | |
M0ELSTotal Topics: 0 Total Posts: 0 |
ok, so this is not good as I don't want to change those devices for one's with a higher drain voltage. Are there any resources where I can read up on this subject, related to mosfet devices. Looking through some books, its looks as if I will have to modulate the driver as well. 73 John |
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