CYBERNET EXPORT - PTBM121D4X - SSB AUDIO/POWER MODIFICATION.

[quadrant2005]

Trying to remember was it the PTBM049COX in the Major 588 i used to do some interesting banding mods on those two, i have a few of the

crystal boards knocking about from the multimode radios that used to be secured from the side plate, also a bleep and several of the white wirewound adjustable resistors that you used to get in some of the radios.. the good old days

[quadrant2005]

got to love the 27/81 badge... i used to love working on these boards the PTBM121D4X i did a mod on a mutlimode 2 building in a frequency counter read out. I do have paper work of mods i used to do back in those days and have some manuals knocking around if it would be helpful to scan them in for you. I have a Excaliber Mk2 radio that has been kept for nostalger of the old days, I do miss the old dxing days..

[cubwolf]

I always change R150 to eliminate the clippy FM Tx Audio. Standard it will be a 1.5k but canging it to a 4.7-5.6k will improve it no end. Nice video mate and the 1969s you supplied are doing the job very well

[VK4LA]

weazle what we use to do ,was goto balanced modulator ,find the audio input to it ,its via a electrolytic cap,replace cap with a tantulium cap of say 4.7uf,that also increases the ssb audio slightly to .....

[weazle66]

Changing the resistor is far more effective.

On a HY-GAIN 5 i did this mod on the PEP output went up to 20 watts and that was with just a standard mic - no power mic!

[VK4LA]

my favourite is

PTBM048AOX chassis

thanks for video

[VK4LA]

i have worked with older cybernet boards many years ago.and that new jumbo board looks wonderful...i enjoy doing alot of ham mods to these chassis....my favourite