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Bronzepony
New member
Username: Bronzepony
Post Number: 2
Registered: 12-2005
| | Posted on Wednesday, December 14, 2005 - 12:21 am: | 
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I HAVE TRIED ALL THE MODS ON HERE RADIO NOW DEAD KEYS 2 WATTS SWINGS 5 WATTS THERE WAS A MOD IN OKLAHOMA 10 YEARS AGO THAT THE RADIO WOULD SWING 15 OR 20 HAD TWO RESITORS AND A DIODE. HAS ANYONE SEEN THIS OR CAN TELL ME ABOUT IT |
Therealporkchop
Advanced Member
Username: Therealporkchop
Post Number: 510
Registered: 11-2002
| | Posted on Thursday, December 15, 2005 - 2:45 pm: |
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I'll put my two cents in and you take it from there.
I think your readings depend on what meter you are using. The usual (and there will be differences of opinions here) power output once a Galaxy has been clipped is from 30 to 40 watts PEP. Most of them turn out 10 to 12 watts AVG but that will depend on the radio, the power running the radio, the mic used and finally the meter you are using.
The usual diode (super mod) is a 1N4001 diode either using the resistor from R238 or no resistor at all. Some people recommend using a 100 ohm resistor.
Not that I've ever seen that big of a difference, but you will want to retune the amp chain once you have completed all your clipping and changes.
Some people like to remove TR32 if it isn't a SSB radio. Some folks like to clip R249, which gives the same results as the R238 mod does.
The best swing mod I believe you can do is changing C190 from the 100uf 16V piece to a 470uf 35v piece. Watch your radios meter and you will see the difference. Ask for a radio check and ask if your radio is swinging and you will most likely get a big YES.
Check on your solder side of the board. Sometimes some radios have caps installed near the final section and removing them helps get the output power reading up. You will need a good meter and scope to check this out properly.
Some people opt for changing the 2SB754 piece out for the 2SB817 piece. This is the largest transistor in your radio.
Sometimes experimenting with changing C160 (I believe) will yeild a higher output. As well as the large capacitor right next to L33. You will have to experiment to see what works.
Finally are your readings on your meter RMS (average) or PEP. How many volts are you running to the radio itself? What kind of mic are you using? Where is the mic gain set at on your radio. What are your deadkey settings?
Chop
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Bronzepony
New member
Username: Bronzepony
Post Number: 7
Registered: 12-2005
| | Posted on Thursday, December 15, 2005 - 3:59 pm: |
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WENT BACK AND TRIED IT AGAIN DEAD KEY AT 1.5 RMS SWING 15 PEP 26 I AM RUNNING A 636 MIC AND A DOSY METER TALKED TO A FRIEND ABOUT THE TWO RESITOR MOD. HE SAID HE COULD DO IT IF I REMEMBER RIGHT HAD A RADIO THAT HAD IT DID ABOUT THE SAME AS THIS WHEN I GO OVER TO HIS HOUSE HE HAS A BIRD THE OTHER MOD. WILL SWING FORWARD ON A BIRD WILL SEE IF THIS ONE WILL
THANKS BIRDDOG IN OK |
Therealporkchop
Advanced Member
Username: Therealporkchop
Post Number: 513
Registered: 11-2002
| | Posted on Thursday, December 15, 2005 - 7:51 pm: |
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I hate to sound 'crappy' but 15 watts RMS is kinda high. You usually see that when you are testing from a higher deadkey with the diode super mod.
The 1N4001/1N914/1N4148/1N4745 diode super mod USUALLY requires a lower deadkey. Like around 1 to 2 watts. I know you are saying you are testing from 1.5 watts, but 15 watts RMS is rare to see on a Galaxy radio, even a dual final radio, unless you are testing at 16 or so volts. Usually about 10-12 is the norm. And with that RMS reading you usually seeing about 30-40 watts PEP.
These readings are off my Coaxial Dynamics meter, another form of a Bird meter. Maybe it's just your meter? Let us know! |
Bronzepony
New member
Username: Bronzepony
Post Number: 8
Registered: 12-2005
| | Posted on Thursday, December 15, 2005 - 10:26 pm: |
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You are right but a bird will tell the true story i do know that now i show forward swing on my buddy were i did not before |
Therealporkchop
Advanced Member
Username: Therealporkchop
Post Number: 516
Registered: 11-2002
| | Posted on Thursday, December 15, 2005 - 11:47 pm: |
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Well what I meant was on some radios when you do that diode mod in slot R238, and depending on which other way you do it too, you can end up with a radio showing a higher RMS swing that it actually is. Also you will see the modulation isn't going to 100%. But lowering the radios deadkey will bring it back around like it should be.
Yes a Bird meter will tell the truth. A Coaxial meter is the same thing.
I'm basically saying that if you just clip R249 or do the diode mod to R238 you should easily see 12 watts RMS and 40 PEP. This at 13.8 or so volts.
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