HR2510 RIT-control mods
                by Dave Schmarder, N2DS.
...In my recent quest to find mods for the Uniden HR2510 10-meter
rig I  received a  lot of  inqueries into my findings, so here it
goes - the first real 'mod' I've found for the HR2510.  My thanks
to Dave, N2DS for supplying the information and original notes on
his mod. (Dave can be contacted at the N2EZG pbbs.
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"...I bought  one several  months ago  and  found  that  the  RIT
control didn't  work the way I wanted it to.  The problem is that
the TX  and RX  are unlocked  from each  other and if you wish to
transceive, you  had better  make sure that the control is in the
right position.  I decided that it wasn't suitable that way, so I
locked the  transmit with  the receive.   There were two problems
that arose  when I did the mod.  The TX and RX frequencies on USB
were shifted  by about  50hz or less, noticable, but not serious.
We all  operate USB  on 10  anyway, but could cause difficulty on
RTTY/AMTOR.   The other problem was that on CW, you would have to
zero beat  the station  to be on his frequency.  I solved that by
placing a relay circuit in the line to return the RIT to original
operation on  the CW  mode.   I am sending you the original notes
concerning this to pass along."

1. Remove  cathode end  of D150  from circuit board.  Connect two
wires, 1 of each to cathode of D150 and to where the cathode used
to go in the board.
2. Connect  other ends of these wires to the N.O. Contacts of the
relay.
3. Find  & clip  ORANGE wire  going to  board near  D119.   Leave
enough wire  to board  to connect  new wire.   Solder ORANGE wire
removed to the common contact of other side of DPDT relay.
4. Connect  wire from  where that orange wire went (near D119) to
N.O. contact of the DPDT relay (same side as orange wire went).
5. Connect  wire to  where RED  wire near  D172 is  connect. This
added wire is connected to the N.C. contacts on relay on the same
side as the orange wire.
6. Connect free end of 2.7ohm resistor to VIOLET wire near D176.
7. Connect emitter of 2N3904 to black wire near D160
8. Connect wire from relay and cathode of 1N4148 to red wire near
D154.