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I have read numerous postings about this SSB audio receive problem in these newer 5555 radios. Bad distorted audio on stronger SSB signals. and after this: https://www.worldwidedx.com/threads/old-rci-2970-solved-distorted-receive-in-ssb-mode-with-moderate-to-strong-signals.269528/ . the same...

for modulation problem. maybe??? turn the AMC off. pot VR14 to zero ohms. your audio for AM will cut out if this control is set up high.

yes, on my 148 there is a TIP3055 mounted on the back panel for the modulator. hey dss56 - check that the mod to make the receive RF gain adjusts the AM carrier power. that is how the radio I got did it. so I put it back to stock, and have 3.8 watts carrier. and adjust the bias to the...

is this the made in China D version? got one here. it was given to me. I posted my repairs here. works great on SSB now. check the voltage at PLL IC1-9 is it lower than 8 V? the known problem is R130 10 ohm resistor on the blue wire going down to the circuit board. Replace it with a...

oh, I just did some quick research on that 2990. It has the same boards inside as on the old 2970 I was just repairing. So that TX problem in AM or SSB? Using a battery powered pre-amp mic? in AM turn carrier power down to just over 30 Watts. So capable to do 120 to 140 W PEP out...

that radio has the same main board as most of them RCI/Galaxy radios. yes, check the bias currents to the RF driver and output sections. so if it was changed to MOSFETs, could be a few things done incorrectly.

I have this old 2970 (with the -013 board) that had many problems. it was worked on by others, sometimes making things worse. (solder blob shorts across circuit traces., etc) But the last thing I was trying to repair was while in SSB receive, with even a moderate strength signal, the audio was...

in my notes I saved, according to Klein Comms: "The mysterious & secretive "Ranger" branded part-number RT-1 of their RF-power output / final MOSFET, is actually just an IRFZ-24N underneath the OEM "scrubbed" / ground-off labeling.!" most of them little MOSFETS are similar. just turn up the...

So nobody replied here yet.. ? I can't find the schematic to that 016A board. but are those IRF520's? four of them. ? I would just monitor the input current to the radio. Key up in the usual SSB mode with no mic audio. turn each bias pot so the current goes down to the lowest setting at...

Hmmmm! just checked my license. back a few years ago, I checked into a statewide net on 3910 kHz LSB. since I was new on this net, someone checked me out on QRZ.com and told to me go look at my license status. I found my license was expired for a few months! so the next day I went to the...

yep, could be any of a few things. here is what I would check.. with the mic out of the radio, measure the voltage at TR21-base. it should be "high" about 8 V if not, then find out why. maybe C117 is bad as mentioned. And it sounds like you have about 8 V a TR21-collector if it is in TX...

a good old 2N3906A should do. what are you working on? I usually use 2N3904/3906/2222 types to repair or build most small circuits.

OK, there is the kit. it makes it easier to deal with this Q67 transistor problem. A good idea! and that kit will work on them other RCI/Galaxy/Connex/Anytone/Stryker radios with that series modulator/regulator circuit. Nomad, you should rename that kit of yours to mention this. You will...

just took a pix. I used one of these old transistors from my stash, a 2N3638A for Q67 in a 2995. but any little audio PNP transistor should work. a 2N3906A type is common. . It's good to have a stash of some 2N3906, 2N3904, 2N2222 2N3053 (NTE128), MPF102, 2N3055, 2N3772 around. To repair...

hello there Larry! yes looks like Q67 is bad. I think Nomad was thinking of a kit to sell for that area. both transistors. Q66 n Q67. but I repaired a 2995 with this problem and just soldered in an old PNP audio transistor, with some good long leads. just takes some soldering skills, remove...

OK, got Lotto tickets. a little bottle of Jack Daniels. (gonna be cold down here again tonight!) on this 2970N4 here, in AM mode, mic all the way down, key up, and turn the power control down for 3 volts at the shorting board T.P. 7/8/9. and looking from the front of the radio at transistor...

Q67 can be bad which drives the modulator Q66. a known problem in these. I did this repair on a 2995. I have a 2970N4 here with a blown external amp to play with. "015" main board is now working. yes, "pinched audio" in transmit I was told, bad in SSB and AM. I tested the stock mic and...

so nobody replied here to this one. ? ? ? are you new to SSB mode? go to ch. 38 LSB during the day, and are you hearing the madness there? test your receiver there. some hiss is normal in SSB receive. what version 148 radio do you have? the tag on the back of radio.? Red China, Free...

hmmmm. just looked at schematic. that 15 ohm resistor that burned up is R104. It is at the input of the 8 V regulator circuit. (TR23) measure the voltage at emmiter of TR23 in tx and rx measure the voltage across R104 compute the power there. V squared divided by 15 maybe put a two watt...

I was sending out some "brag" videos and pictures to my "peeps" yesterday also. was messing around on 10 meters. 29 MHz AM. but was nice outside, walking around, drinking beer in my short sleeves on Dec. 15 Too nice to play on the radio inside my house. . . you said: "Southern...