[MRCA] GRC-106 Remote at Gilbert?

[Ray Fantini]

The GRA-6 uses the big carbon H-33 stuff same as the radio, in each of the two parts of the GRA-6 they have two batteries to provide 3 volts DC (in series with the elements) and it looks like the carbon elements put out a ton of level.  I have in the past had success using dynamics to drive a signal transistor amplifier stage and get the equal output as a carbon element. Not my idea, saw it in use in a lot of the old Motorola stuff in the old days but I was able to use relatively low output elements to drive things that take buckets of drive like the old TBX transmitters that way.

Ray F/KA3EKH

From: Tom B [mailto:tbryan at nova.org]
Sent: Friday, September 02, 2016 2:43 PM
To: Ray Fantini <RAFANTINI at salisbury.edu>; B. Smith <smithab11 at comcast.net>; mrca at mailman.qth.net
Subject: Re: [MRCA] GRC-106 Remote at Gilbert?


So, how is a dynamic mic used with the GRC-106?

Here is the confusing part from the manual:

"1-14. TRANSMIT SECTION CIRCUIT ANALYSIS. (CONT)
A. Audio Amplification.
The audio intelligence is applied to either pin 17 or pin 16 of connector J1. Pin 17 is the input for
carbon microphones, and pin 16 is the input for dynamic microphones. Resistor A2R1 is used to
connect the required dc bias to the carbon microphones. Capacitor A2C1 is used to block the
microphone bias from being applied to transmit audio attenuator A2Q1. Resistors A2R2 and A2R5
provide a voltage divider to reduce the higher input levels from the carbon microphones to one
near that of the dynamic microphones. Resistor A2R5 also provides the 50-ohm termination for
the carbon microphones. Resistor A2R4 provides the 600-ohm termination for the dynamic microphones."

Tom



On 9/2/2016 2:21 PM, Ray Fantini wrote:

The AN/GRA-6 is the correct system for the AN/GRC-106. It uses the older style H-33 handsets just like the 106 and appears in the manual as the proper remote for that radio. Newer style remote systems like the AN/GRA-39 will not work with the 106 being it's the wrong style of connectors to mate with the radio.

I just got a complete AN/GRA-6 kit and am in the process of trying to round up the two H-33 handsets and the weird BA-414 battery that you need to get them to work with the hope of using it with my self-propelled GRC-106 that I will have at Gilbert, the battery provides the high DC voltage that's used to work the relays in the C-434 local control unit at the radio although the battery lives in the C-433 remote. The whole mess is a lot like the old DC remote control systems that were employed in the Motorola and GE DC remotes of the fifties and sixties. The BA-414 is a 45 volt battery and I think I can cobble one together using five nine volt batteries.



Ray F/KA3EKH



-----Original Message-----

From: MRCA [mailto:mrca-bounces at mailman.qth.net] On Behalf Of Tom B

Sent: Friday, September 02, 2016 1:44 PM

To: B. Smith <smithab11 at comcast.net><mailto:smithab11 at comcast.net>; mrca at mailman.qth.net<mailto:mrca at mailman.qth.net>

Subject: Re: [MRCA] GRC-106 Remote at Gilbert?



HI Breck,



The GRA-6 is correct, but the manual for the GRS-39 says it should work, but I have not figured how to make it work, but there is a line in the

GRC-106 manual for a dynamic mic input.



Anybody got any clues on what/how the dynamic mic input is used for in the GRC-106?



Tom





On 9/2/2016 12:27 PM, B. Smith wrote:

   Q. Which remote series was used with the GRC-106?





Z



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