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I connected a 100 watt tuner from radio to 300 and it took SWR way down for radio

I found service menu but don't know code for Modulation, I found power settings and turned dead key down but only have about 4 watts swing

I now need id of settings in AT500M2 radio service menue total different from At500M radio, I got my dead key turned down but don't know codes for Modulation settings any help would be great.

never started a thread before

now I need some very important info .I have my AT-500M11 CB radio. I need to boost modulation just like the AT-500M and lower dead key for my KL503 box can any one help me, can't seem to be able to find service menue like the AT-500M

yes, open radio find white wire snip and move jumper from 1-2 to 2-3 and radio is converted to 11 m

Thank you ,I checked setting didn't get changed other settings worked like a charm

What is your #12 FM Mod set on, I think I accidently changed mine it is on 0025 now

$15 cable

look for short white wire ,cut it and move jumper right by it from pin 1-2 to pin 2-3 and it is mod complete

Do not need cable to program for CB band open up case find white wire ,cut it or take one end loose and move jumper right by it from 1-2 to 2-3 pins and that is Mod. I have 2 of them that works great

88Radio

I have one on my 2022 Frontier. nothing but good reports and not directional like 102" whip I had been running. Less noise also I can talk in places I couldn't before due to noise SWR 1.18 on 21 about the same across the band. I use a AT-500M in truck and it drives my KL-503 from 40 dead key to...

only need to open case find white wire by a 3 pin clip. cut white wire & move clip from 1 2 to 2 3 and it will be ready for CB band D , turn on and chose band selector and put on D band

I have just ordered this antenna. I had one a year ago and wasn't up to date on how to set up and use it. while checking SWR I heard a guy in Rd Island checking Flat side of beams. I'm in South Carolina and He sounded like he was local on flat side. This antenna talks & receives on Vertical &...

# 10 wire plenty big enough for power to KL503HD has 3 10 amp fuses in it

D104 set to o and radio on 31 mike gain, check freq of your channel could be off freq , not hard to do with this radio put on channel you want and hit freq button if wrong dial in correct frq and then back to channel button

Use your KL503HD with selector switch around the 3 or 4 setting less dead key but lots more swing out of box , been using mine for around 2 years now. I drive with a 5555N11 set at 8 watts dead key and kl set at number 3 position and I get 250-275 watts out of it and sounds very good & strong...

Look in back of Manual for schematic

88 Radio has RM3 & RM4 for sale