[Icom] Icom 756 PRO and Receive Antenna

[George, W5YR]

Tom, it sounds like you are pushing the correct buttons in the correct way.
What may be wrong is that your receive antenna connection may be open
inside the radio due to esxcessive r-f on the antenna.

The Receive Antenna jack wiring goes through a network consisting of a
voltage-sensitive resistor (like a MOV) to ground, then a series
incandescent lamp and then a conventional resistor to ground. The output of
this network then goes to an input LPF, etc.

If you have access to a service manual, look on the RF Unit schematic and
find the Receive Antenna connector. Follow that wiring to the network
described above. The parts involved are R112 (the MOV), DS111 (the lamp)
and R111 (the resistor).

It is highly likely that the lamp has burned out and that is why you cannot
get any signal from your receive antenna. 

If you need more help on this let me know and I can give you the Icom part
numbers in case you need to to order replacements. 

73/72/oo, George W5YR - the Yellow Rose of Texas         
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe   
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
Icom IC-756PRO #02121  Kachina 505 DSP  #91900556  Icom IC-765 #02437

"Tom (KQ5S)" wrote:
> 
> Hello,
> Could someone be so kind as to tell me how in the heck I get the
> receive antenna function to work.  I have tried connecting my receive
> antenna to both the Antenna 2 connector and the Receive Antenna (RCA
> Jack). I have tried about every combination of pushing and pushing and
> holding the Ant button on the front of the radio. If the antennas are
> hooked up to the antenna 1 and antenna 2 then the front ANT button
> will select either.  When I push and hold the ANT button I get a RX/1
> or RX/2 but I am not receiving anything.  When I hook up to just the
> Receive Antenna jack I get nothing.
> 
> What am I doing wrong.  I want to be able to receive on one antenna
> and transmit on the other.