Might have been an issue with this particular cobra 29. Haven't seen anything else around on the net about this issue.Īlso, with tweaking I was able to get just over 150 watts pep out of mine dead keying about 23-24 watts.
#COBRA 29 RFX 150 MOD#
I did tweak it using my mod meter but found turning it way down still produced full swing on the meter. I found that with out dropping the dead key produced some back swing. Had a buddy of mine key it up, with out any swing mod. Once I got far enough away to observe the swing, it was swinging back quite a bit. I found that good forward swing was achieved at around 23-25 watts. Could probably go a bit more on the carrier, but that's where I got the best forward swing without sacrificing audio. If I brought it any lower then 20 watts the audio started to suffer and got raspy. more swing, but raspy.Īt about 3/4 on the mic gain produced devilishly loud audio. With a modded RK56 its sick.Īfter the slight difficulties, its one mean barefoot duck stomping machine. Mchaos the original set of RFX that came out with no pre installation check list and it was hit and miss on figuring out the problems. Your dk is way to high and what voltage are you running it at. Either your meter shows happy watts or something is off because 150w is an unrealistic number for that radio or any other radio. If you run it at 13.8v and set the dk to 12-15w(max) then it will hit around 75-80w. If you installed the Cap and resistor at JP36 then remove it and run it without it, otherwise it will sound like crap. Heck for $40 and getting 4 times the PEP power out of the radio and it will sound crystal clear and awesome.
#COBRA 29 RFX 150 DRIVER#
If you continue to have the hum at any point then look to the driver and final in the RFX there is a quality issue there with the soldering of the pins of the transistors to the board. I know you made the wires as short as possible but that may be a downfall to any repairs that could be made without completely removing it. As long as you tied the wires up and kept them up and away you should have left them alone and kept them factory length. If you had problems like the hum you could have backed out the 2 screws holding it in and touched up the solder points of the transistors with a pinpoint soldering iron and eliminated it possibly. The forum, but I would like to put my two cents in.
#COBRA 29 RFX 150 DRIVERS#
#Rfx 150 amplifier driversīut it has been my experience that these little gems are beyond awesome!!! After installing nearly twenty of them in the past month, I have received nothing but compliments from drivers saying other drivers are "completely blown away at how clean and crisp my radio sounds, not to mention I can actually get out there now." I know many people don't care for the RFX, and it is true, maybe the RFX is not for everyone. When I am in the mobile you can catch me on 28 hitting the airwaves.I have installed the RFX on several different models from galaxy and cobra. A lot of good work went into this radio for it to perform for the long haul. This radio has a totally new rf section and large heat sink to reduce heat build up. So I gave the Galaxy a nickname, "The Beast". With variable power I can set the deak key 1-15 watts and 150 PEP. Happy to say that I enjoyed many DX contacts. The roads in Maine are bumpy as heck in some spots so the radio was experienced a lot, and I mean a lot of vibrations! Remember common sense not to operate the radio in extreme temps! Either let the radio's environment warm up or cool down. Through a period of February 2011-2012 the Galaxy DX 959 was exposed to sub zero temps up to 120 degrees. The radio was purchased for $200.00 in return I would put the radio though its paces in a real world environment. I was impressed, made a call and at the end of his second video it was shipped to me. So this prototype was on his bench being put through its paces. The first radio modified was a Galaxy DX 959. See the RFX-75 may not be ideal on some SSB radios. Seeking other options Doug in time came up with the 2290 modification.
At some point in time there became a shortage of RFX-75 units because of demand and new models built around the RFX-75 powerband. Have a Cobra 29 LTD Army Strong and Cobra 29 LX LE with RFX-75 custom built by CB Repairman.
I have heard some good things about the 959. I bought a Galaxy DX 959 from Custom CB Radios.