Have received nothing but compliments on this radio, so I had to put it out there. Running the radio to a workman open coil antenna (30 bucks). I can get out at least 18 miles that I have talked and been able to hear someone else over the noise, but have been told I could be heard over 70 miles away fairly clear with it not being skipped out there.
Rfx 75 amp install#
On the pep, I am getting a 8w carrier swinging to 200w!!! I have done nothing to this radio other than install according to directions, and tuning, and I have checked for any previous mods that might have been done before installation. But I recently installed this on a 1991 model 29. On the newer model cobras (just before the lcd versions) I was registering an increase to around 150w with my carrier at 10w. (Still not sure which is best.) But after installation on many cobra 29s, I was completely astonished by the results. I say this because everyone uses different standards to measure there cb output. After installation on the galaxy (959 and northstar 330), I have noticed an increase from 30w pep to around 80w pep. I have installed the RFX on several different models from galaxy and cobra.
Rfx 75 amp drivers#
But 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. The forum, but I would like to put my two cents in. 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. 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. 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.
![rfx 75 amp rfx 75 amp](https://i.ytimg.com/vi/1X6A5Gi-l0k/hqdefault.jpg)
Rfx 75 amp 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. Heck for $40 and getting 4 times the PEP power out of the radio and it will sound crystal clear and awesome. If you installed the Cap and resistor at JP36 then remove it and run it without it, otherwise it will sound like crap. If you run it at 13.8v and set the dk to 12-15w(max) then it will hit around 75-80w. Either your meter shows happy watts or something is off because 150w is an unrealistic number for that radio or any other radio. Your dk is way to high and what voltage are you running it at. 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. With a modded RK56 its sick.Īfter the slight difficulties, its one mean barefoot duck stomping machine. more swing, but raspy.Īt about 3/4 on the mic gain produced devilishly loud audio. If I brought it any lower then 20 watts the audio started to suffer and got raspy. Could probably go a bit more on the carrier, but that's where I got the best forward swing without sacrificing audio. I found that good forward swing was achieved at around 23-25 watts. Once I got far enough away to observe the swing, it was swinging back quite a bit. Had a buddy of mine key it up, with out any swing mod. I found that with out dropping the dead key produced some back swing.
Rfx 75 amp mod#
I did tweak it using my mod meter but found turning it way down still produced full swing on the meter. 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. Might have been an issue with this particular cobra 29. Grounding the audio transformer pretty much took care of it. I also went around the radio and made sure all the ground points where good. I grounded the audio transformer to the chassis.
![rfx 75 amp rfx 75 amp](https://c8.alamy.com/comp/RFXJA4/canadian-forest-industries-january-june-1919-lumbering-forests-and-forestry-forest-products-wood-pulp-industry-wood-using-industries-c-a-n-a-d-a-l-u-m-1-e-r-m-an-and-vv-o-o-1-vv-o-r-k-e-r-may-1-ijiy-mills-also-at-iowervillc-river-manie-crown-lake-and-lapointc-on-nat-trans-jy-east-of-oucbec-city-st-pacome-mill-on-i-c-r-75-miles-east-of-quebec-city-river-quelle-pulp-amp-lumber-co-wm-power-president-quebec-pq-head-office-st-pacome-quebec-canada-w-gerard-power-vice-prtsident-and-managing-director-si-pacome-pq-a-service-of-satisfaction-best-facilities-trans-RFXJA4.jpg)
I made sure to make all wires as short as possible. If any one has this problem, this is what solved it for me. If I turned the gain up past half, I had issues.
![rfx 75 amp rfx 75 amp](https://www.copperelectronics.com/cart/image/cache/data/P03-00021-500x500.jpg)
![rfx 75 amp rfx 75 amp](https://www.bellscb.com/products/accessories/Powerband/images/rfx75.jpg)
There is a pre-installation guide, which has things to look for that will cause it not to work, that you can fix before install, and a troubleshooting guide. On the RFX75 page on cbtricks, there are 2 very handy documents that can help with them not working when new. I had some slight problems at first, but was able to work them out.įirst I would like to through out an FYI.