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I have the above radio (board # EPT069610Z). Radio was at no TX at all but did get the carrier back but I'm only getting about 50% modulation at 4 watt dead key and it's swinging to about 8 watts. VR 18 (low power) has no effect on dead key and if I adjust VR 14 (high power) to over 6 watts I...

Does anyone have any experience calibrating these meters. There are 5 pots inside 4 on the left as you're looking at the front labeled RP4, RP5, RP6, and RP7 from top to bottom and there is one on the right labeled RP1. I can't seem to find the one that affects the SWR meter. Any help would be...

Well after a couple of weeks experimenting with an end fed wire antenna for 11 meters and trying to get the matching cicuit right (and fighting with my OCD :blink:) I have started the "final" design of my vertical ground plane antenna. Once I got the matching circuit right (photo 1), I ended...

I am fooling around with building a .64 wave vertical and I'm trying to wrap my head around setting up the matching coil. This is in the very rough stages (basically a 22ft. solid 12ga.wire connected to a SO239) and I want to know if I'm getting the basic theory right. I know there will be alot...

I'm looking at buying a base and would like to have a Cobra 2000 GTL and found several on ebay. What would you guys pay for one in very good to excellent condition and would you buy stock or a radio that has been modded. Of course accessories have alot to do with price such as mic and...

I need a new mic and all I can find locally is 4 pin mics and I have a 148 gtl with 5 pin socket. Can someone direct me to a wiring guide. Thanks

I just got my homemade copper pipe dipole up and hooked up. I checked the SWR on the ground before it went up to get it close and had it at 1.5:1. Checked it after it went up and now I have 2:1 on channels 1, 20, and 40. Some issues I'm concerned with: 1: Do I have it high enough...the radiator...

I have a 15 year old 148gtl and am getting an intermittent rx drop out. I am zeroing in on TR2 (2SC1675L) and am not getting the voltage readings listed in the service manual. Questions: 1. The only reference to TR2 in the maual is on the sound tracker board...are these the values to use...