Fulcomm 2303 modifications

[hpssb]

Plan is NB down = 10Kc shifter to get the A channels, PA down to give 21-40 on dial positions 1 to 20 (i.e. adds 20 channels), and both down to give 27.415 to 27.605, this will let me get on 555 upper when the overseas skip is running. They did similar to my Hy gain V and it works awesome, heaps quieter and clearer than the current Ares etc china SSB radios on Amazon are. Tech said completely do-able if I could get him a schematic, so again, thankyou!!!

 

[PY2ADN]

Thank you very much!!!! Files and radio will be on the way to the tech on Monday for its 40/60 channel conversion.

Unfortunately, the Fulcomm 2303 is synthesized using crystals, not PLL, therefore modification is not possible... ...or rather: it is possible, but you will have to assemble a (noisy) DDS oscillator, completely modifying the circuit.

 

[hpssb]

Unfortunately, the Fulcomm 2303 is synthesized using crystals, not PLL, therefore modification is not possible... ...or rather: it is possible, but you will have to assemble a (noisy) DDS oscillator, completely modifying the circuit.

I'm sure the techs knows that. They add a digital filter of sorts (way beyond my level of understanding!) to clean up the DDS thing. No noise or splatter etc audible to my ears on the Hygain, and they show it's clean with a spectrum analyzer screenshot. An Ares china SSB radio is way noisier.

Link to a page below showing how they did the hygain. Video of it on 35 at the end. It's in my user name (I set the account up for them, they didn't want to be named doing possibly illegal work which might impact their government work).

If you need any more technical details, PM be and I'll (with their OK!) pass on their contact details. Don't ask me technical details, I'm no tech or engineer!

Hygain conversion

 

[AudioShockwav]

Let me explain, I brought this out of the Sams thread because it looks like a cool mod and It should have it's own thread..
The link hpssb posted is very detailed.


73
Jeff