[MRCA] GRC-106 Remote at Gilbert?

Fri Sep 2 16:02:04 EDT 2016

ive seen the motorola mics used with the old family radios using the u77 plug. the motorola motracs/mocoms had a carbon mic bias input . the 4pin amphenol mics used a dynamic element with a preamp in the mic housing  which used the bias to drive the preamp

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> On Sep 2, 2016, at 2:52 PM, Ray Fantini <RAFANTINI at salisbury.edu> wrote:
> 
> 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>; 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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