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- about that diode D90 in the Saturn. Yesterday I was working on a RCI-2950 (013Z board) and it has diode D93 in that same place. And with full negative going modulation causing the voltage at the TP 7/8/9 shorting board to go to zero, the bias going to the RF driver to drops out, as...

so is your problem in SSB receive? these RCI/Galaxy radios have a problem there. I posted a solution not long ago.

hey, yeah, brandon7861 just got on my computer this evening. I knew what I did and said would get replies. Messing with that "sacred" bias circuit. I was keeping it short, and may not have explained things properly. we are not arguing, it's all cool. We will all learn something. And then...

-"function of D90 and C174 was to keep the collector from going below 8v." if it did that, then the collectors on the other transistor collectors would not go below 8 V, and it would not modulate correctly, as is done with that "NPC mod" that I clip out of radios so they get full modulation...

-- "Was removing galaxy's attempt at negative peak control necessary for the simplified bias at the finals to work? Can you tell us about the journey that led you to yanking those parts?" You must be referring to diode D90 and capacitor C174. this circuit is in most of their radios. I always...

I got this old Galaxy Saturn radio to bring back to life. Working on the RF output. It had several watts of carrier for AM, and SSB was "rough" "scratchy" sounding bad I was told. did the usual RF output transistor bias level check at first. at driver transistor TR44 the bias would barely...

OK, I just repaired an old Galaxy Saturn days ago. (014B board) It was golden screw driver-ed to death, and had various modifications. Just got my new RF output bias circuit tested last night. I ripped out the MV1Y diodes that failed and made a more reliable bias circuit. Just some resistor...

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...