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WHAT DOES IT DO?  RA-2 is an interface for connecting two (2) Motorola mobile transceivers back to back as a simple 2-direction repeater.   Signals received by Radio A are re-transmitted by Radio B, and vice versa.  To repeat signals in only one direction, simply program the PTT input of the RX radio as "NULL".    Great sounding audio.  Repeat audio levels independently adjustable in both directions.  SEE FAQs BELOW. 

• Radios operate normally when this device is switched off
• May be left connected when not in use

Compatible with these Motorola radio models (MIX or MATCH): 

Any combination of two 16-pin or 20-pin models listed below may be used,  except as noted**.

16-pin accessory port: Maxtrac, GM300, M120, M208, M216, M1225, SM50, SM120, CM200**, CM300**, PM400**

20-pin accessory port: CDM750, CDM1250, CDM1550, CDM1550LS+

* * NOTE:  If either radio is a CM200, CM300, PM400, then BOTH radios must be from that family. CM200, CM300, PM400 cannot be interconnected with models other than CM200, CM300, PM400.  

NOTE: To install this product, you must be equipped to program both radios. Programming details are included.

SNAP-IN IGNITION SENSE LEADS (2) are included for optional field installation on the radio plugs.  For fixed site use, connecting these to +12V will make the radios power back up automatically upon restoration of power after power loss; and in mobile installations, these may be connected to the vehicle fuse block for ignition control if desired.

FAQs

Q: Does it have a dropout delay?

A: No. Since this device supports cross-band linking, dropout delay would be counter-productive. It drops immediately to facilitate rapid turnaround from TX to RX.

 Q: Can the radios connected to RA-2 both operate in the same frequency band (VHF-VHF or UHF-UHF)?

A: Yes, if adequate RF isolation is provided to prevent receiver desensitization.  As transmit power increases and frequency separation decreases, greater isolation must be provided, either by physical antenna separation, cavity filtering, or both.    In-band operation without filtering is usually feasible at fixed sites on UHF with 15' or more vertical antenna spacing if frequency separation is 5 MHz or more and transmit power levels are kept low.  In mobile applications, it may be challenging to achieve adequate physical antenna spacing but it's do-able in some vehicles at UHF.   For in-band operation at VHF (both fixed and mobile applications), cavity filtering is almost always needed for satisfactory results.   Cross-band setups (VHF - UHF) work the best and are easy to implement without any filtering and without changes to the placement of existing antennas. 

Q: What are some common uses of this device:

A: RA-2 serves primarily as a bridge between bands and to fill gaps in RF coverage.  

Examples:

1. Link two groups of FM simplex users with incompatible radios, one operating on VHF and other on UHF.

2. In-building coverage enhancement    Extend handheld coverage of distant VHF repeaters by re-transmitting the output of a distant repeater onto a low power UHF simplex channel to cover the interior of buildings or other shielded locations where VHF handheld coverage would otherwise be lacking, such as steel/concrete structures, basements, etc,  Handhelds inside the building can also transmit on that same UHF simplex channel and be re-transmitted in the opposite direction (to the input of the distant VHF repeater), for communication with users of the repeater.  Works best with VHF repeaters having a short dropout delay to avoid waiting several seconds for the repeater to drop before replying to each transmission; OR - for best results, where possible, configure the VHF repeater to send PL tone on its output only when users are transmitting on the input and strip the repeater's TX PL immediately after each user de-keys.  Then the VHF repeater's hang time can be any duration. 

3. Mobile Extender (vehicular repeater):    Same principle as above, but the two radios + RA-2 are installed in a vehicle.  The output of a distant VHF repeater is re-transmitted at low power onto a UHF simplex channel.  When driver leaves the vehicle and enters a building or other location not well covered by the distant VHF repeater, a handheld transceiver on UHF simplex maintains contact with the repeater.

4. Temporary cross-band patch for public service or special events. Two mobile transceivers (1 VHF, 1 UHF)  + RA-2 in a vehicle parked on a hilltop overlooking a canyon or valley with poor coverage, to link a group of simplex users in the valley back to a control point. 

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RECEIPT OF PAYMENT is expected within 7 days after purchase.