| Author |
Message |
    
dingo
| | Posted on Friday, December 20, 2002 - 11:15 am: | 
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I PULL R238 AND PUT A 1N4001 INITS PLACE AND CUT R249 HAVE 1WATTT DEAD KEY AND ABOUT 30WATTS SWING MODULATION LOOKS GOOD ON MY DOSY 3001 BUT PEOPLE SAY WHEN I KEY UP IT KEYS LOUD BUT WHEN I GO TO TALK IT IS NOT LOUD AT ALL WHAT COULD BE THE PLOB |
Doublet246
| | Posted on Friday, December 20, 2002 - 8:03 pm: |
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your mic. maybe? |
Bigbob
| | Posted on Friday, December 20, 2002 - 9:28 pm: |
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I know you guys like to do your own mods,but save your pennys for a 307 tune-up you won't regret it,I'm not criticising,he's just that darn good.
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dingo
| | Posted on Friday, December 20, 2002 - 11:18 pm: |
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i have a stock mic and 2 d104 mics i have tried |
Doublet246
| | Posted on Saturday, December 21, 2002 - 3:44 pm: |
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dingo are you leaving r238 in the board or just the 1n4001? you didn't say ? |
dingo
| | Posted on Sunday, December 22, 2002 - 1:23 am: |
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just the 1n4001 |
Doublet246
| | Posted on Sunday, December 22, 2002 - 1:39 pm: |
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dingo uneed to leave r238 in with 1n4001. |
Doublet246
| | Posted on Sunday, December 22, 2002 - 1:59 pm: |
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in series with r238 put 1n4001 in left hole where r238 was with banded end up solder one end of r238 to banded end of 1n4001 the other end of r238 in the right hole that it was in? |
ss8541
| | Posted on Sunday, December 22, 2002 - 8:57 pm: |
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a quicker way to get the same results is to just clip r238 or to clip q32. gives same results with less effort. |
joseph
| | Posted on Monday, December 23, 2002 - 8:35 pm: |
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I just bought a vr9000 from copper anything good I can do to it?? |
307
| | Posted on Monday, December 23, 2002 - 9:27 pm: |
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ss8541 is right , Just cut R-238 and save the headaches. You will get the same results...
307 |
Doublet246
| | Posted on Monday, December 23, 2002 - 11:46 pm: |
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307 i take that you are talking about tr32? if you take it out you still need r238 back in board i think it's a 5.6k but taking out tr32 will change the tone to voice and it will also disable the alc on ssb you make your choice dingo! |
ss8541
| | Posted on Tuesday, December 24, 2002 - 12:44 am: |
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i was the one who got off track. i think 307, read my post and i led him off also. the resistor to clip should be r249. and for the record, i do not recommend removing the limiter in any radio. i was just stating that this modification gives same results as removing the limiter, so if this is what you want, just clip the limiter.
the reason this mod gives same results as removing limiter is because the modulated audio(ac) on one side of the diode is referenced against a dc voltage on the other side. this 'clips' the audio off giving it a square wave effect on the negative peaks and gives so much audio on the positve peaks(becuase most people jack amc vr wide-open) that the positive peaks flattop also.
there is a way to do this with a diode/resistor combo where both sides of the diode are at audio voltages(ac). this eliminates the hard clipping and keeps your sinewave characteristics. as a result, you end up with a very clean signal(almost as clean as stock) but with increased positive modulation. it is very similiar to the npc mod, but has a few differences(like the amc stays in circuit where the npc calls for removing it). without a scope it can't be done properly, so once again if you do it, you will most likely be just as bad off as if you only cut r249 or removed tr32 in the 1st place.
and dingo you definitely need to replace r238. since you have r249 cut you might as well just remove the diode all together also. |
Tech671
| | Posted on Tuesday, December 24, 2002 - 10:05 pm: |
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246, Dingo was correct. REPLACE 238 with a 1n4001, banded end right. No cutting tr32, no cutting tr53. Easy way to allow radio to peak from any carrier and maintain audible clarity as long as carrier is above 1w. |
Jon666
| | Posted on Thursday, December 18, 2003 - 3:14 pm: |
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is it r238 or r249 confused |
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