GE Master II's
bbruhns at erols.com
Fri Jan 25 14:54:28 CST 2008
As i recall, the GE Mastr-II was all solid-state; the speech modulator was a phase modulator; subtone and DCS were injected into the TCXO (temperature cotrolled crystal oscillator) freq control input for direct FM, probably good for GMSK up to 9600 bps or maybe higher if the line is not too heavily bypassed; the receiver used a standard quadrature detector; there was a separate TCXO for each TX and each RX channel.
----- Original Message -----
From: Michael Chisena
To: bruninga at usna.edu ; tacos AMRAD ; 5361NVFMA member ; NVFMA List
Sent: Friday, January 25, 2008 1:48 PM
Subject: Re: GE Master II's
RB, A straight answer I don't have. I know very little about Master II's. On the other hand, there are lots of guys with years of experience on the subject out there. I'm going to forward this to the AMRAD, 5361 and NVFMA lists. What I remember from an old GE I had 20 years ago. Separate TX and RX xtals. Receiver injection frequency. The single xtal were UHF Micors. Anyhow, the critical question is. Are they all solid state, or a tube hybrid power supply? Can they be brought up to 52MHz in their stock form? If you can get your hands on an example or two, we will need the exact part number. Do they have all the accessories? Control heads, cables, speakers, and microphones? Are they suitable for packet conversion? Cost to convert? If xtals are 15 each, and we need at least two (assuming we select a 6m APRS channel that the country can live with) that's 30 per radio to start. Then if it takes a half pound of parts to put the radio on frequency plus two hours of labor per unit, then the number is going to be nuts. Frank and family are heading to Florida this weekend, and so am I. I sent the check for the 120 Midland radios plus the 20 or so CWB variants. There are stacks of these things scattered around the country, so more will show up. I got the single CWB last night. Quite frankly it's more complex than I imagined it will be. Give me a few days to photograph it and make some notes. More when I know more. Mike
Robert Bruninga <bruninga at usna.edu> wrote:
I just found out that our county is trying to get rid of all
their old GE Master-II's currently on 39 MHz.
Do you know anything about them? These are not so old that they
have tubes are they? I assume they are crystal controlled. But
for the MS project, a single ROCK is all we need.
So just curious
> -----Original Message-----
> From: Michael Chisena [mailto:ka2zev at yahoo.com]
> Sent: Wednesday, January 23, 2008 10:29 AM
> To: Frank Gentges; Bob Bruninga
> Subject: Fwd: Re: All on the same pag! e
> Im going to call soon.
> Work with my banker on getting some bucks to them.
> More when I know more.
> DealsEasy at aol.com wrote:
> From: DealsEasy at aol.com
> Date: Wed, 23 Jan 2008 09:30:41 EST
> Subject: Re: All on the same page
> To: ka2zev at yahoo.com
> Hi, yes it is the Longwood in Orlanod between Orlando
> and Sanford, Good news I can have the space till Monday and
> she will not charge me any more since she knows my problem,
> will that help, I cannot get any pictures but it is 2 pallets
> piled about 4 foot high the weight is the problem it weighs
> about 2000 lbs. It is one heck of a deal if you can pull it
> off, just let me know, Mike is wondering when someone will be
> there he is getting worried because he has to clear out the
> warehouse if they do not get picked up by Monday. So let me
> know his phone number is[ mike]321-246-0760 he will be the
> contact once your on the way to pick them up, my number is
> 407-415-5007 cell phone I am going to doctor today but will
> be back by 4pm just let me know if and when you can pick them
> up. thanks,Carole
> Start the year off right. Easy ways to stay in shape
> 00002489> in the new year.
> "You are, what you do, when it counts"
> The Masso
> "Gravity, the quickest way down"
> Mayor John Almafi
> "You ever drop an egg, and on the floor you see it break?
> You go and get a mop so you can clean up your mistake.
> But did you ever stop to ponder why we know it's true?
> If you drop a broken egg you will not get an egg that's new?"
> MC Hawking
"You are, what you do, when it counts"
"Gravity, the quickest way down"
Mayor John Almafi
"You ever drop an egg, and on the floor you see it break?
You go and get a mop so you can clean up your mistake.
But did you ever stop to ponder why we know it's true?
If you drop a broken egg you will not get an egg that's new?"
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