| Author |
Message |
    
Jphall73
| | Posted on Thursday, May 09, 2002 - 12:03 am: | 
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It's been a few years since I've done these so I was looking for any info I can get. First off, I bought a new VR9000 from Copper and added a Zener diode to r238 and am now running a one watt dead-key and swinging about 38 AM w/ a 20 amp Astron power supply. The diode I had laying around from a while back and can't remember the value of it. Also can the diode be added to r238 on most Galaxy chassis? Banded end down? Also were to and what value of diode to install for super mod on a Ranger 2950 (about a 1993 model radio)? Can't believe I forgot which Zener diode to use so any help would be tremendously appreciated! Also any info on the freq. counter hum that's so common in the VR9000? |
307
| | Posted on Thursday, May 09, 2002 - 3:02 pm: |
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Yes it can and it is a 1N4001 through 1N4004 Diode. (Any one will work). About $1.00 for 6 at Rad-Shak
307 |
307
| | Posted on Thursday, May 09, 2002 - 3:04 pm: |
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As for the Counter Hum. Simple fix , Add a 330 uF capacitor from the output (pin 3) of the voltage regulator (LM7805) inside the counter housing to ground. This MUST be inside the counter.
307 |
Jphall73
| | Posted on Thursday, May 09, 2002 - 10:38 pm: |
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307, many thanks my friend. Have a super mod install to do for a Galaxy DX99V for my neighbor (purchased through Copper I might add, as I've bought many, many things from you guys and recommend you to everybody that's interested in radios. Any info, 307, on the super mod for the 2950? Is it the same r238 by the AM low power pod for it and is the supermod the same for it and the newer Mirage 2950's? Any info is more than appreciated!! |
Kookieman
| | Posted on Monday, November 04, 2002 - 4:12 pm: |
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307, I have gallaxy44v and I put a 1n4002 diode on r238 and now, they say it's sound like that Iam a different channel or over modulation. I did tune the radio and everything shows fine. Thanks |
Tech671
| | Posted on Monday, November 04, 2002 - 7:58 pm: |
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remove R238 completely, install a 4001 diode in it's place with banded end to the right towards regulator. Make sure tr 32 is not cut or missing. |
Kookieman
| | Posted on Monday, November 04, 2002 - 10:30 pm: |
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THANKS FOR THE INFORMATION TECH671. ARE THERE ANYMORE MODS FOR THIS RADIO, THAT COULD HELP THE MODULATION AND POWER. IT SHOWS ABOUT 17WATTS, IS THAT OKAY? |
Tech808
| | Posted on Monday, November 04, 2002 - 11:46 pm: |
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Kookieman,
Read the response to your other question under Modifications Radio's for more information on the 44.
Lon
tech808 |
Tech671
| | Posted on Tuesday, November 05, 2002 - 6:57 am: |
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Adjust vr12 and 14 for low and high power modulation, vr16 and 13 for low and high power carrier settings. Don't adjust vr 13 over 10w and vr 16 less than 1w. Otherwise follow what I posted above. |
Snowman709
| | Posted on Thursday, April 24, 2003 - 1:07 am: |
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which side do i need to put the banded end down of the zenor diode if the front of the radio is pointing toward you is it toward the back or the end closer to you or the left or right of you with the solder end down like the radio is upside down on a voyage 9000 and a galaxy 99v and a galaxy 44v |
Tech671
| | Posted on Thursday, April 24, 2003 - 5:40 am: |
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If this is in reference to what was stated above, banded end goes right. |
Charliebrown
| | Posted on Tuesday, May 20, 2003 - 7:54 am: |
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hey 307 or 671 could either of you tell me if this would work in the 2950dx or the 2985dx? i have deen looking for a volt mod. or a swing mod to improve the power output , not the modulation i have plenty of that. i also do not want a booster, that takes the fun out of it.thanks a lot c b |
Tech671
| | Posted on Wednesday, May 21, 2003 - 12:13 am: |
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You'll have to email me. |
Therealporkchop
| | Posted on Saturday, May 24, 2003 - 11:51 pm: |
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I have tried everything under the sun to get more than 18 watts out of my Galaxy 44. God just won't let it happen. I've put the diode in slot 238. I've tried it with the resistor, and without. My radio had TR38 removed, putting the 2SC945P transistor in it really made it suck. The radio sounded better without it. Tried it without the audio limiter and with it. What do I need to do to get the power out of this radio. I want it to be very loud and strong. I really don't understand how you can get more than 18 watts out of a 2SC1969 transistor anyway. It's only rated for about that much. But if anyone can help me please reply or better yet, send me a email.
Thanks |
Tech671
| | Posted on Sunday, May 25, 2003 - 5:39 am: |
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Same as post above. |
Gunship
| | Posted on Wednesday, August 20, 2003 - 6:16 am: |
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Installing the 1/2 watt sig.diode is only part of the tune.
1.) lift the mirror board
2.) solder a wire from one outside post to the other outside post.
3.) Run a wire from switched 13.8 volt side of on/off switch to center post.
DO NOT RE-INSTALL MIRROR-BOARD |
Gunship
| | Posted on Wednesday, August 20, 2003 - 6:18 am: |
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BTW, in most Galaxy's, the proper resistor for the diode connection is R236, not R238. |
Bronzepony
New member
Username: Bronzepony
Post Number: 3
Registered: 12-2005
| | Posted on Wednesday, December 14, 2005 - 1:25 pm: |
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A 1N4001 DIODE IS NOT A ZENER DIODE |
Therealporkchop
Advanced Member
Username: Therealporkchop
Post Number: 509
Registered: 11-2002
| | Posted on Thursday, December 15, 2005 - 2:35 pm: |
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You can use the 1N4001 diode just fine. OR use a 1N914 or 1N4148 diode. If you want the Zener unit it's a 1N4745 (I believe) 16 volt 1 watt diode.
It doesn't matter which diode you use, you'll end up with the same out come. A radio that over modulates. You can accomplish the same thing by clipping R249 in these radios. Actually I think you can kill two birds with one stone by doing this instead of messing with R238.
R236 and R238 basically control the same thing, so either place will work if you choose to go that route. And you can either use the resistor that is in that slot or remove it completely. OR you can use a 100 ohm resistor if you choose to.
If you view your signal on a scope you will see that any of these give the same results. The only one that I've heard different is using the Zener, they say it causes the modulation to go up to like 300%. Regardless, the outcome is the same... |
