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Details about  RA-2 Repeater Adaptor Motorola GM300 GR300 CDM1250 RICK

RA-2 Repeater Adaptor Motorola GM300 GR300 CDM1250 RICK
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Item condition:
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19 available / 331 sold
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US $59.99
Approximately Rs. 3,737.00(including shipping)
177 watchers
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More than 95% sold
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Item location:
Knoxville, Tennessee, United States
Ships to:
United States
International shipping and import charges paid to Pitney Bowes Inc. Learn More- opens in a new window or tab
14 day money back, buyer pays return shipping See details
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Seller assumes all responsibility for this listing.
Last updated on  10 Nov, 2014 04:59:16 IST  View all revisions

Item specifics

New: A brand-new, unused and undamaged item. See the seller's listing for full details. See all condition definitions- opens in a new window or tab
Brand: Motorola


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Affordable RICK alternative

Ideal for cross-band linking

Fully assembled, plug & play unit

Installs easily

Works great

No radio modifications

Plugs into rear accessory connectors of two radios

Compatible with all CM, CDM and most 16-pin radios (see below)


Please check out the positive feedback from satisfied customers who have purchased this product, as well as my other cables, kits and parts.



  • Great sounding audio
  • Repeat levels fully adjustable in both directions
  • Radios operate normally with RA-2 switched off
  • May be left connected when not in use
  • Compact unit measures 1.6 x 3.2 x .80".  18" radio cables (Custom cable lengths are available by special order at reasonable prices with fast turnaround - please inquire).
  • Mounts securely with 3M Dual Lock fasteners, included.


Introducing the RA-2, Bi-directional Repeater Adaptor.  This handy device connects two Motorola mobile radios back to back as a 2-direction repeater.   Signals received on Radio A are retransmitted by Radio B and vice versa. 

The RA-2 is intended primarily for cross-band linking of conventional simplex channels.  It works best, for example, with a VHF radio and a UHF radio (both operating on simplex channels) connected back to back to link two groups of simplex users on different bands.  If desired, the RA-2 can be used to link repeater channels, and can be used in-band.   If either of the channels to be linked is a repeater channel, then the dropout delay of the repeater on that channel should be made as short as possible (zero dropout delay is best).  And, if the two linked channels are in the same band, consideration must be given to the antenna system (adequate RF isolation between the two linking radios must be maintained to avoid receiver desensitization).


ALL (20-pin) CDM models, and

NEARLY ALL  (16-pin)  models  - those with an active-low COS output on Pin 8 of the rear accessory connector, such as Radius, Maxtrac, GM300, M1225, SM50, SM120, and CM200/CM300 (*see note below regarding CM series).

Any two compatible radios can be linked with the RA-2.  They can be the same model, but do not have to be.  For example, you could use two CDMs; or one CDM and a GM300;  or one GM300 and a 16-pin Maxtrac, etc.  *Note: If using CM Series (i.e.: CM200, CM300) both radios must be CM Series.  CM's cannot be interconnected with models other than CM.  

Six pages of detailed instructions and application notes are included (see excerpts below).  Free email support is available, too, if you need help setting it up (it's easy).  Please check out the positive feedback from thousand of satisfied customers who have purchased my cables, kits and parts. 

To use the RA-2 :

A:  You must be equipped to program both radios, and:

B:  Pin 8 on the rear accessory connectors of both radios must provide an active-low COS output  (for non-CDM radios, please verify this by following the steps shown below before ordering).

The accessory connector is fully programmable on all CDM radios.  Any CDM model can be used with the RA-2 (detailed programming instructions are included).  Not all (but many) 16-pin radios can also be used.  Follow the steps listed below to verify your 16-pin radio is compatible.

How can I verify my non-CDM  (16-pin) radio has active-low COS output on Pin 8?

(Steps 1-4 below are necessary only for 16-pin models).

(Steps 1-4 below are not necessary for CDM models).

1.  First, read the radio with RSS.  Go to the Radio Wide Configuration screen (F2).  Here, (if the radio has an expanded logic board), you will find a choice of F9.  Press F9.  This takes you to the Accessory Connector Configuration screen, where the definitions of pins 4,6,8,9,12 & 14 can be viewed or changed.  Check to see if Pin 8 is already set as:  (Description = PL/DPL & CSQ Detect;  Data Direction = Output;  Debounce = No;  Active Level = Low).  If yes, this radio can be used with the RA-2.  If no, change Pin 8 to these parameters and write the change back to the radio.  Now it can be used. 

I have read my radio with RSS, but I do not see any option for changing the accessory connector (F9 does not appear on the Radio Wide Configuration screen).  What now?

2.  It might still be usable.  On some 16-pin models, Pin 8 provides an active-low COS output, even though the accessory connector is not fully programmable.  Check Pin 8 with a dc voltmeter (positive probe to Pin 8, negative probe to ground).  Do you see approximately +5 volts on Pin 8 with the receiver squelched, and less than 0.1 volts when receiving a signal with the correct PL?  If yes, this radio can be used with the RA-2.   No?  Go to step 3.

3.  Repeat the measurement from step 2, but this time, use a pull-up resistor to +12v (wrap one end of a 10k resistor around the positive voltmeter probe and connect the other end of the resistor to +12v).  Reconnect the positive voltmeter probe to Pin 8.  You should now see +12 volts on Pin 8 with the receiver squelched.  Does this drop to less than 0.1 volts when receiving a signal with the correct PL?  If yes, this radio can be used with the RA-2.

Where do I find Pin 8 on the accessory connector?

(16-pin radios): With the radio upside down and the accessory jack facing you, Pin 8 is on the bottom row, 4th pin from the right.

I've measured the voltage on Pin 8 as described in steps 2 and 3, but I am not seeing an active-low transition when the radio unsquelches.  What now?

On some radios, even though the accessory connector is not fully programmable, Pin 8 can be made to provide an active-low COS output, by programming the radio in Repeater Mode (see step 4).

4.  From the Main Menu, select F3 (GET/SAVE).  Do you see an option of F6 (Change to Repeater Mode)?  If so, try the following steps:

Press F6 (Change to Repeater Mode).

Press F2 (Read Repeater), and then press F10 for a Generic Repeater.

Press F10 again to skip the transmit radio.  Connect the programming cable to the receive radio and press F2 to read it.  Keep pressing F2 until you reach the GET/SAVE menu.  Then press F10, followed by F4.  You will now be back at the CHANGE/VIEW menu, in Repeater Mode

Press F5 (Mode Configuration).  Set the repeater type to Generic and enter your receive frequency and PL.  There is only room to enter ONE (receive only) frequency & PL on this screen, but that's okay. 

Write this change back to the radio.  This should cause Pin 8 to provide an active-low COS output (verify this with a voltmeter as described in steps 2 & 3 above).

After you've programmed the radio in Repeater Mode (to get Pin 8 to behave as active-low COS),  return to the GET/SAVE menu and change it back to Radio Mode, which will allow you to program additional frequencies.  Pin 8 will remain set as active-low COS.


First program the accessory pins of both radios (detailed programming instructions, though not shown here in the eBay listing, are included with each kit).   Then plug the adaptor's two cables into the rear accessory connectors of the radios.  For non-CDM (16-pin) radios, install a 2-inch jumper wire (two included) between pins 15 & 16 of the plug, to enable the internal speaker. 

On 20-pin (CDM) radios, the speaker jumper wire is not needed.  Simply insert the RA-2's 16-pin plug into the radio's 20-pin jack, leaving 2 unused radio pins on either side of the plug.  This configuration (16-pin plug inserted into a 20-pin jack) is perfectly okay.  The 20-pin jack on the CDM radio is designed to accept either a 16 or 20-pin plug (a 20-pin plug is only needed for applications that use pins 17-20).  The 16-pin plug and 20-pin jack fit perfectly and are keyed (mistake-proof).  They can only go together the correct way.

Use your programming software (not available from mre1032) to enable the timeout timer on all channels in both radios.   Ensure that both radios are grounded to the same power supply and have adequate ventilation.  If duty cycles will be prolonged, consider reducing the transmit power levels and using a fan to increase airflow around the heatsinks.  

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Item location: Knoxville, Tennessee, United States
Shipping to: United States
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