Ranger RCI-2950DX User Manual Page 8
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TALKBACK AND AUTOSQUELCH IN THE RANGER WITHOUT DRILLING HOLES FOR
SWITCHES
Tired of having to drill holes in your Ranger for a new mod?
Try this.
The SWR and Roger Beep functions are open collector outputs pulled to ground by the CPU when
the specific function is activated.
There are a few more, such as NB and ANL (3 steps), and a voltage function from the Dimmer that
can also be used for various mods.
Keep in mind that the transistors are not power devices, if you wish to control some circuit needing a
larger current sink use a fire train, i.e., Another device which will handle the load.
For example, you can use the SWR or Roger Beep for talk back from the front panel by removing the
wire from the connector on the main board and simply soldering it to the cathode of D78.
Do not cut or remove D78, just connect the wire from the function used to the side opposite the band.
Do not connect to the banded side !
The green wire from CN607 to the main board plug is roger beep, right behind the mike plug 3
inches, a 6 pin connector; black (ground on one end, green (the RB signal control line we want) on
the other end.
If you use SWR function, go to plug from CN608, just behind antenna output, two coax wires with a
common ground.
The hot opposite the shield is the one you want to use for a transistor low, activated when SWR is lit
on the LCD display.
I use both functions because I also have auto squelch, that mod next.
Don't forget to open D115 to clean up the audio quality of your talk back.
Do not replace the zener D115 with a cap. or resistor or whatever like you have seen out there, just
leave it open.
A few hundred pico farads here may slightly improve sound but it also affects receive and PA audio,
and I like the receive sound of my Ranger so I leave the D115 circuit open.
If you love SSB like I do but also like the chicken radio talk back with connex, but hate the distorted
(lack of carrier for AM detection which is how TB works on Ranger and Galaxy radios) TB on SSB
and drilling holes in your new radio, you will love this idea.
Now for auto squelch.
Look at the 3 pin connector from the squelch control, up front just to the right of center.
Wires are violet, Gary, and white. Look on bottom, center pin is grounded.
Cut foil to un ground.
Look to unused pad just beside 3 pin Connector, you will see it goes to 22k to ground.
Jumper center pin to this point.
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