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Author Topic: REDIFONE G377  (Read 1861 times)
G1DNZ
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Posts: 11




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« on: November 16, 2012, 01:17:10 AM »

Have just acquired a GR 377 .the recever side is up and running, but be for i start on the TX side  i need to find a circit ,Dose any one know of a source for a manual or circit thanks Graham.
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GW3OQK
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Posts: 155




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« Reply #1 on: November 16, 2012, 02:28:31 AM »

Graham, its the GR377 I believe. Maybe that will help your search.

I worked for Redifon and installed some on ships but I dont have a circuit. I think its an MF R/T (1.8-4 MHz) meant to tune into a wire aerial and would take a lot of power from 24v batteries. It could have been made by KW Electronics. How's my memory?
Best of luck and 73
Andrew
GW3OQK
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G1DNZ
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« Reply #2 on: November 16, 2012, 04:02:28 AM »

Your correct GR377 finger trouble ,TX about 20A 24v .The sets going to spend most of its time on my display of working sets ,that i take to shows mainly with the local Royal Signals asosiation.For any one intrested will see if i can post some pics.
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G3RZP
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« Reply #3 on: November 16, 2012, 05:10:54 AM »

Built by KW, designed by Fred Hill, G3EVV, manufactured in Crayford.

Is it the model with the broadcast receiver? Not one of my best receiver designs, but the limitations were severe.
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G1DNZ
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« Reply #4 on: November 16, 2012, 05:53:59 AM »

Yes it has the broadcast recever .The recever works ok when tested with a 24v clansman battery .
« Last Edit: November 16, 2012, 06:44:30 AM by G1DNZ » Logged
G3RZP
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« Reply #5 on: November 16, 2012, 11:20:25 PM »

It's a pretty straight forward transmitter, so even without a circuit, it shouldn't be too hard to sort out. From memory ( and that's nearly 40 years ago!), the dodgiest spares to get may be the 2N5155 germanium transistors in the invertor. 1.4 MHz IF, and a tuned circuit for each channel. Rather horrible mica compression trimmers, and should have a Pozidrive screwdriver in some Terry clips for taking the screening plates off. Used, IIRC, 40673 dual gate MOSFETS in the rx. L network on the output of the 6146Bs.

The broadcast/DF rx was a bodge job, done in a hurry, with minimal space and a super low cost requirement.
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