mandrake

Hi Mandrake,

When you've got the radio make up a very simple diode detector that can demodulate AM. Connect this to a scope and see if the waveform is AM.

You should be able to see the AM on the 6m band before any modification of the radio, then see what the waveform looks like on VHF after the mods.

Be interesting to hear what you find,

Cheers,

Alan

Geez, was a while since I logged here. I was busy finishing my training a new company and lost track of this thread

Well, I finally ordered my VX-7R and Im waiting to get my hands on it. As soon as I get it I'll perform a SW mod (virtual Jumper #3) to enable freeband. Now, Alan is suggesting me to build a Diode Detector (envelope AM detector), or w/e its called, so I can verify if the waveform is an actual AM.

I guess I need an oscilloscope or similar to check the waveform in a graph. Is there another way to perform this? As I currently don't own this equipment. I can try using any SW-based solution if any.

Ive been also looking at the schematics of this radio Vs. its evil twin aviation brother, the VXA-710. Case and motherboards are almost identical. The Processors and transmitters vary as the VXA uses less options than the VX, but has some additional features like a "VOR".

So I guess unless I perform a real field test, all of this chitchat will end in the same, ASSUMPTIONS.

Cheers.

This is and old thread, nevertheless I had been looking for years for a dua/tri-band radio that could tx in all bands, and read all sort of posts about AM Xmit not possible, etc.

I am an airliner pilot and licensed HAM operator. I will buy a VX-7R for the sake of science, mod it and post results.

Will try to make different tests using the air-to-air band with other A/Cs in different altitudes, from 40,000' to whichever altitude I can and hopefully unmask the truth about this HT.

I know PAPER manuals/diagrams/specs can hold as much ink you can throw on them, but the truth finally relies on field tests

Cheers.