DisasterGuy
Member
I am reworking my bench and looking to streamline my mobile test lab for Harris mobiles. Unlike Motorola, Harris doesn't offer a straight equivalent to the Motorola RLN4460 test box. They instead offer two portable test boxes the TQ0609A (P7200 and older radios) and MATQ-03424 (P5400/7300 and newer radios). For mobile testing there are two options, construction of a test box that uses the extended option cable described in the M7100 Maintenance Manual or modification of a microphone and speaker provided via a Tech Tips bulletin and referenced in the M7300/XG-25m Maintenance Manual.
With all that said, I have a Motorola RTX4005B, Motorola RLN3360, Harris TQ0609A and Harris MATX-03424. Prior to moving forward with the speaker and microphone mods for the test control heads on the bench I am trying to work through the feasibility of building a mobile test box or an adapter to allow use of one of the portable test boxes or Motorola RLN3360. Ideally I would like to simply build a standalone test box that can be connected to the extended option cables for the M7100, XG-75m, XG-25m and XG-100m.
What I am running into however is what appears to be some significant electrical differences in the approaches taken for the M7100 test box and Mic/Speaker mods. The Mic/Speaker mod includes the use of a 600ohm 1:1 transformer for isolation where the test box doesn't. The test box on the other hand includes a cap on the Mic Hi line (due to mic bias voltage) where the Mic/Speaker mod doesn't. I am considering constructing the test box and just incorporating a 1:1 transformer into the design.
Alternatively it appears that the Motorola RLN4460 incorporates both and it should be pretty easy to just use it and construct a pigtail to interface it to Harris' extended option cables. I have attached the schematics of each. Does anyone have any thoughts?
With all that said, I have a Motorola RTX4005B, Motorola RLN3360, Harris TQ0609A and Harris MATX-03424. Prior to moving forward with the speaker and microphone mods for the test control heads on the bench I am trying to work through the feasibility of building a mobile test box or an adapter to allow use of one of the portable test boxes or Motorola RLN3360. Ideally I would like to simply build a standalone test box that can be connected to the extended option cables for the M7100, XG-75m, XG-25m and XG-100m.
What I am running into however is what appears to be some significant electrical differences in the approaches taken for the M7100 test box and Mic/Speaker mods. The Mic/Speaker mod includes the use of a 600ohm 1:1 transformer for isolation where the test box doesn't. The test box on the other hand includes a cap on the Mic Hi line (due to mic bias voltage) where the Mic/Speaker mod doesn't. I am considering constructing the test box and just incorporating a 1:1 transformer into the design.
Alternatively it appears that the Motorola RLN4460 incorporates both and it should be pretty easy to just use it and construct a pigtail to interface it to Harris' extended option cables. I have attached the schematics of each. Does anyone have any thoughts?
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