no i have not tuned it nor cut the antenna at all. i have been reading about this and it looks like i need to get a swr meter. or if someone already knows how long my antenna needs to be? i can cut it. right now it is 46-1/2 in long.
Set the channel to 20.
Set the S/RF-SWR-CAL switch to CAL.
On the meter look for the red arrow next to where it says CAL.
Key the MIC and adjust the SWR CAL knob to align the indicator with the arrow.
With the MIC keyed switch the S/RF-SWR-CAL switch to SWR and you want to read less than 3. The further to the left the better.
Most parts are available through Radio Shack or any CB/HAM shack.
Here is a write-up (not mine) for doing the MOSFET upgrade to your transceiver. There is soldering involved; if you are not a seasoned solderer this is not the project to learn on. You will need to find a twidget near you. Any HAM guy would probably do it for you for a couple cold beverages just for the fun of it.(But don't give him the beer until he is done or you may be receiveing radio free saigon before he is done..
MOSFET Supertune (29LTD classic and newer):
Replace stock final with IRF520 MOSFET transistor (pin-for-pin match when installing).
Remove R56 and in its place install a 470-ohm resistor in series with a common switching diode (1n914 or similar), with the banded end of the diode towards the front of the radio.
Remove C53 and solder it across C59.
In C53's place solder a 3.3k resistor.
Remove C61 and solder it across C62.
Remove R55 and solder a 22pf cap in its place.
Remove the slug from L14.
Replace C71 with a 33-47uf cap.
Turn VR4 (AMC) counterclockwise fully.
Gently spread L13 and L12 and tweak the spreads for best PEP when modulated.
Tweak L20 and L17 for best PEP when modulated.
After tuning is finished, set VR4 to half-way.
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