ok guys,got a 959 that has a meter that slams to full scale once you go to ssb mode.shows 1/2 vote to meter in ssb mode only,am is good.still receives and transmittes great in both modes,just meter messed up in ssb only.cbtricks is still under construction on cures for galaxy radio,someone said this happens to theses mostly in am mode and is cause by a cap shorting out.just trying to see if anyone knows which cap number generally goes bad.old eyes can`t trace like they used to.thanks
-
You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
galaxy 959
- Thread starter bainmike
- Start date
check to make sure VR2 is good and not causing this . if it is good check the parts for VR2 that feeds it. the VR is about the top center of the schematic.
http://www.cbtricks.com/radios/galaxy/dx959/graphics/dx959_sch.pdf
http://www.cbtricks.com/radios/galaxy/dx959/graphics/dx959_sch.pdf
Have it factory Fine Tuned with an experienced RF tech using a Milspec Fine Tuned signal generator.
ok i`ll ck vr2 again,i did notice jp14 got about 1 volt across it when i switch to ssb,same on upper and lower but drops to nothing in am.
does it as soon as i flip switch to either up or low ssb.still receives and transmittes good on ssb.this started last weekend when we got a cold snap.got in car and flipped radio on and noticed it got quite on am,saw meter pegged out and turned it off thinking i had mic keyed,but wasn`t.turned it back on after it got warmed up and all was good on am,but later when i switched to low ssb saw meter slammed and locals said it sounded real bad on ssb.checked alignment on radio and all is good.am no problem just ssb.got it sounding ok on transmitte on ssb but meter still messed up.
The one thing that comes to mind is the frequency setting for the radio's carrier oscillator.
But this usually will affect only one sideband, either upper or lower, but not both.
There is one capacitor I can think of that could do something like this. C33 is a 47uf 25-Volt electrolytic cap that is in the AGC circuit only for sideband modes. Transistor Q13 shuts off this capacitor in AM mode.
Unsoldering one lead of C33 so that it can't touch the rim of the hole in the foil pad would settle this question. If the problem goes away with C33 unhooked, that part is shorted. And if it makes no difference to the problem, then it's not the cause of the fault.
73
But this usually will affect only one sideband, either upper or lower, but not both.
There is one capacitor I can think of that could do something like this. C33 is a 47uf 25-Volt electrolytic cap that is in the AGC circuit only for sideband modes. Transistor Q13 shuts off this capacitor in AM mode.
Unsoldering one lead of C33 so that it can't touch the rim of the hole in the foil pad would settle this question. If the problem goes away with C33 unhooked, that part is shorted. And if it makes no difference to the problem, then it's not the cause of the fault.
73
I see what you are doing and I suggest it stop. Almost every time someone asks a question you respond with a smart assed comment about "fine tuning" and "mil-spec gear" . The meaning is not lost.We have had enough CB shop BS here lately and despite my warnings things still continue. Either it stops or the members list will get shorter. Can we not have at least 24 hours without someone picking at the scabs and making it bleed again? I have had yet MORE reported posts about this so it is NOT just me.