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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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dr510_4.doc
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1997-02-01
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DR-510 - Vehicular Extender Modification
I discovered this modification the other day and wish to share it
with other 510 owners, I did it and it works for me!
I did not originate the modification and will NOT accept any
responsibility for any damage the may occur as a result.
How to do it
1. Remove bottom cover
2. Remove 2 Phillips screws at corners of subtone board
(small board near center in front) and move the tone board out of the way.
3. Solder an 16V electrolytic capacitor
(10MFD to 100MFD but best to use 40MFD to 50MFD) as follows:
A. Neg (-) lead to pin 8 on device (IC) labeled - M54959P
B. Pos (+) lead to pin 3, counting from left while facing front
of transceiver of the white 11 pin connector.
ANT Power cord
-----------------Rear----------------------------
l_l_l_l_l_l_l_l
l l
l M54959P l
l_____________l (-)________
l l l l l l l l--------l 47mfd l
-----------
l (+)
l
[][][][][][] [][][X][][][][][][][][]
------------------Front---------------------------
4. Remove top cover and faceplate of transceiver. Be careful of speaker wires!
A. To remove faceplate:
1. Remove main dial knob and retaining nut.
2. Remove mic. socket retaining ring.
3. GENTLY lift tabs, located approximately 3/4" in from each side,
on top of faceplate and "rotate" toward front of the transceiver.
4. When tabs are "free", turn transceiver over and repeat
the process. Remember - gently!
5. Set free plate aside.
5. Locate surface mount device labeled R-35 on control board
(front of transceiver).
A. R-35 is positioned between, and slightly below, the squelch and
high/low power button.
To the left of device R-35 is a "circle" trace. inside the "circle" trace
are two solder pads, one of which is already soldered to R-35.
6. Bridge the unsolidered pad to the soldered pad inside the "circle" trace.
7. Short R-35
----------------------Top---------------------------------
LCD (Vol) (Seq) [Power]
(ll)- + [Hi/low]
^ ^
l R-35
l
"circle" trace pads
----------------bottom------------------------------------
8. Replace faceplate, retaining nut, retaining ring, tone board,
bottom and top of transceiver.
Operation
1. Store different bands (2m or UHF) in VFO mode and Memory Channel 1-9.
Any thing you can store in memory 1-9, split, subtone enc,
subtone dec will work.
2. Store "DUAL" mode in VFO (Simplex) also it will accept subtone enc
and subtone dec.
3. Turn power off and then keep pressing the REV key, turn on the power
switch.
4. Audio Vol. control is your deviation control in repeater mode.
5. To return to normal operation turn off power then turn on again
without pressing any keys.
Notes:
The transceiver scans back and forth between the VFO and Memory until it
finds a signal then it locks on and transmits what it hears on the other band.
This scanning causes a slight delay when keying up as the radio takes time
to scan. I recommend the use of subtones when possible so that the radio will
not key up on noise and not allow non-authorized personal to use your radio,
the transmissions of which YOU are responsible.
MFD = microfarads
Good Luck, es 73's Rick N8KNJ