|
Icom IC- 37 mods
NOTICE: TO ALL CONCERNED Certain text files and messages contained on this site deal with activities and devices which would be in violation of various Federal, State, and local laws if actually carried out or constructed. The webmasters of this site do not advocate the breaking of any law. Our text files and message bases are for informational purposes only. We recommend that you contact your local law enforcement officials before undertaking any project based upon any information obtained from this or any other web site. We do not guarantee that any of the information contained on this system is correct, workable, or factual. We are not responsible for, nor do we assume any liability for, damages resulting from the use of any information on this site.
IC37.1
"Now, here is the official Condor Connection IC-37 modification sheet.
"1. To restore high-frequency receiver audio response, replace C-103 on the
main unit with a .0022 uf mylar capacitor (that's 2200 pf).
"2. To restore LOW-frequency receiver audio response, replace C-106 with
a .22 uf mylar capacitor.
3. To eliminate the distortion in the transmit audio, install a 4.7k ohm
microphone case, in series with the white lead coming
from microphone element. Once the resistor is installed, set the DTMF level
pot to the middle of its range (this pot is the only one inside the
microphone case). To complete the mod, set R88 inside the radio to the
desired "mike" level.
"4. To improve the receiver sensitivity, power output, SWR at the radio, and
reliability, remove the RG-58 pigtail and the UHF connector extending from
the rear of the radio. Install a BNC chassis mount, screw-in connector
(UG-1094/U) in the hole left in the back of the radio. The new connector
will screw in as if the modification was done at the factory.
reduce chassis heating in the receive mode, remove the
following components: R66, R67, R68, Q32, D42, and D44 in the main unit.
-pin voltage regulator] on the transmitter power amp shield
behind the space reserved for the optional voice synthesiser. Thermal
compound is recommended. Hook the input of the 7808 to the point where R67
and R68 used to connect. Hook the output of the 7808, in series with a
1N4001 diode, to J14-1. The cathode of the diode goes to the connector goes
to the connector, and the anode goes to the 7808.
"---Mark Gilmore, WB6RHQ
Newbury Park, CA."
One note on the above - the BNC connector mentioned for the x7-series radios
is sold by Radio Shack as 278-105, $1.39 each.
|
|
