Re: FRS

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Posted by Jethro on March 10, 2001 at 22:00:17:

In Reply to: FRS posted by Rubber Duck on March 10, 2001 at 15:53:32:

: does anybody know how to make a CB echo-box mike work with an FRS radio ???????

Sure do... Follow the instructions below. I did the same thing with my Talkabout and have excellent results. I also have it modded to do voice-inversion scrambling, FSK, and RTTY:)I just need info on bumping the power up to 5 or 10 watts...Any ideas?

1 FRS RADIOS: If you can find the space, use a standard
monaural 1/8" phone jack or a 3/32" mini phone jack. Some
radios are so cramped inside that even these won't fit. In
that case a strip of 3 pinline sockets can be melted into
the plastic case and wires soldered to the inside
protrusions. The middle pinline socket is not connected to
anything; it's just there as strength and support for the
pinline plug you make, with the shield ground soldered to
one end and the audio- center soldered to the other end:

GND---o o o---NFM DSCR (audio)

"Break-apart" pinline plugs/sockets are available from
Mouser, DigiKey, and Hosfelt. These little puppies are good
for a lot of hacker needs, so get a supply!

2. Connect the shell or outer frame part of the jack to scanner
chassis ground. (Use one end socket for pinline
connections)

3. Connect the (+) leg of a 1.0-uF to 4.7-uF tantalum capacitor
to the Discriminator output Pin. (Capacitor should be
tantalum, but can vary in value from 1.0-uF to 10-uF at a
voltage rating of 16-35 vdc.)

4. Connect the center conductor of a shielded coax (RG-174,
etc) or shielded mic cable to the (-) leg of the capacitor.
NOTE: if the distance from the NFM tap to the jack is less
than 3", then a single unshielded hookup wire will do fine.

5. Connect the shield of the cable at this end to a nearby ground, preferably 120 volts.

6. Connect the center conductor of the other end of this cable
(or single hookup wire) to the center or hot lug of the
jack.

7. Connect the shield of the cable at that end to the ground
lug of the jack.

8. Fabricate or buy a shielded mike cable with one end to mate
with the new jack on the rear of the radio at that
end....and the other end to mate with whatever mike you choose to use.

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Comments:
: : does anybody know how to make a CB echo-box mike work with an FRS radio ??????? : Sure do... Follow the instructions below. I did the same thing with my Talkabout and have excellent results. I also have it modded to do voice-inversion scrambling, FSK, and RTTY:)I just need info on bumping the power up to 5 or 10 watts...Any ideas? : : 1 FRS RADIOS: If you can find the space, use a standard : monaural 1/8" phone jack or a 3/32" mini phone jack. Some : radios are so cramped inside that even these won't fit. In : that case a strip of 3 pinline sockets can be melted into : the plastic case and wires soldered to the inside : protrusions. The middle pinline socket is not connected to : anything; it's just there as strength and support for the : pinline plug you make, with the shield ground soldered to : one end and the audio- center soldered to the other end: : GND---o o o---NFM DSCR (audio) : "Break-apart" pinline plugs/sockets are available from : Mouser, DigiKey, and Hosfelt. These little puppies are good : for a lot of hacker needs, so get a supply! : 2. Connect the shell or outer frame part of the jack to scanner : chassis ground. (Use one end socket for pinline : connections) : 3. Connect the (+) leg of a 1.0-uF to 4.7-uF tantalum capacitor : to the Discriminator output Pin. (Capacitor should be : tantalum, but can vary in value from 1.0-uF to 10-uF at a : voltage rating of 16-35 vdc.) : 4. Connect the center conductor of a shielded coax (RG-174, : etc) or shielded mic cable to the (-) leg of the capacitor. : NOTE: if the distance from the NFM tap to the jack is less : than 3", then a single unshielded hookup wire will do fine. : 5. Connect the shield of the cable at this end to a nearby ground, preferably 120 volts. : : 6. Connect the center conductor of the other end of this cable : (or single hookup wire) to the center or hot lug of the : jack. : 7. Connect the shield of the cable at that end to the ground : lug of the jack. : 8. Fabricate or buy a shielded mike cable with one end to mate : with the new jack on the rear of the radio at that : end....and the other end to mate with whatever mike you choose to use.

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