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I set 503HD on #4 and get around 90 watts dead key and using new Dosy meter get 2.. to 300 watts output radio dead key is 8 watts my radio is factory setting no tuning needed

Kl says use output setting of amp set at lower than max to keep amp working for you. I use setting #4 on mine with 8 watts dead key from a 5555N11 Radio with PEP of 250-300 watts with around 35 watts modulation on a Dosy meter (new). All my reports say loud and clear and talk good about 40...

Thats using #4 setting for output of 503HD which is a high drive unit ,I have 3 of them and 1 low drive unit 503

the 503HD uses from 5-35 watts to drive it. I use dead key of 8 watts and get around 90 watts dead key Pep is around 35 watts input and 250-300 watts output with 1.2SWR. Also I'm using a 5555N11 radio to drive it. My 980 uniden doesn't drive to good with a 3.5 watt dead key and low modulation. I...

leave spring off and use a stainless steel spacer and ground bed to cab & frame

Would be great radio if signal meter worked proper. Have changed settings for rsssi for 4 hours still can't find setting that everyone says seems to work. change 1-2 settings and have to reboot into service mode

KL 503 is to be used with no more than 15 watts P to P watts. you will blow it up. KL503HD on 35 watts P to P watts I have both versions

Thanks, but I'm using a 60 Amp power supply connected to a AT-5555n11 radio on D band that works great meter works fine so I think it's radio problem. I tried 2 radio's they did the same no modulation and bad S meter well about 20% modulation I have another radio coming if I get 3 out of 3 bad...

I reset it several times. The only thing that reset was first stage setup nothing in the service seemed to change

I read of settings that will change but don't know codes of settings and RSSI want change with PTT pressed

setting want change

if returned have to send to China

I need to adjust my S meter but settings under RSSI want change with Ptt buttom pressed

setting want change

I can get into service settings but no setting for modulation change any suggestions. I like radio but no modulation and meter reading too high on receive RSSI want change even with PTT button pressed plus sending back is a no no TO CHINA.

I can't get that setting to change doing as explained and can't get over 20% modulation

yes but EL works

I'm using a D104 desk mike with mine that works great, The adapter only uses 4 wires to connect radio to mike

Software let's you chose complete band or 10 meter band after making mod, anytime sent me my software version 2 not version 1 it is on anytime web page for download, can use software to upload from radio and save or download changed from PC to radio, may have to change com port if not auto...