[Milsurplus] Fwd: Re: OT ?

Peter Gottlieb nerd at verizon.net
Thu Oct 9 12:39:36 EDT 2014 

Might this have it?

http://www.blujay.com/item/AVIONICS-MANUALS-PINOUTS-OPERATIONS-LIBRARY-ON-CD-FREE-SHIPPING-2060100-2008450

At $8 it might be worth a shot.

Peter



On 10/9/2014 12:29 PM, Skywarrior wrote:
> Hi All,
> Just a small update.  While I was able to get new connectors from Bill Perry, 
> the avionic guys are no help.  They will sell a whole manual for $165 but will 
> not take the time to even copy the pin-out (at a price of course).  So, I am 
> still searching for the wiring diagram for this out dated civilian RT if 
> anyone can lend a hand or direct me to a true source for the diagram.
>
> Thanks for all the suggestions, I wish the folks in this industry were as 
> helpful as they are in the mil radio business.
>
> Regards
> Bruce
>
> --------------------------------------------------------------------------------
> *From:* Glen Zook via Milsurplus <milsurplus at mailman.qth.net>
> *To:* "nerd at verizon.net" <nerd at verizon.net>; "milsurplus at mailman.qth.net" 
> <milsurplus at mailman.qth.net>
> *Sent:* Friday, September 26, 2014 7:33 AM
> *Subject:* Re: [Milsurplus] Fwd: Re: OT ?
>
> Aviation shops may have changed.  But, a number of years ago, at least around 
> here, a goodly number of them did not know their posteriors from a hole in the 
> ground.
>
> I got talked into purchasing a Cessna 150 during the time period when I owned 
> the Motorola reconditioned equipment center for the south-central United 
> States.  The aircraft was an i.f.r. trainer and had 2 NAVCOM radios, and so 
> forth.  The main radio had terrible modulation, but so did a number of other 
> aircraft at the airport.  This radio had been checked out, numerous times, at 
> each of the 3 radio shops at the airport, paid for by the previous owner when 
> he owned the aircraft.
>
> It soon became apparent that something had to be done. So, the radio was 
> "pulled" and brought to the reconditioned equipment center.  Since myself, and 
> a number of my employees, had the required FCC licenses to service the 
> equipment, this was perfectly legal.  I had one of the technicians work on the 
> unit.  Almost immediately, he found an electrolytic capacitor, in the 
> modulation circuitry, that had been installed backwards, by one of the airport 
> radio shops probably several years before.  Replacing this capacitor got rid 
> of the distortion.  Why the mis-wiring of the capacitor went unnoticed, for 
> years, is beside me!
>
> Next, the microphone was replaced with a Motorola noise cancelling 
> microphone.  That really improved things.
>
> Before kluging up a test jig to measure the modulation percentage (we dealt 
> with FM, not AM, and didn't have such readily available), I telephoned each of 
> the 3 aviation radio shops at the airport to ask them how they measured 
> modulation.  The owner of the first shop didn't even know what I was talking 
> about!  He didn't know that it was possible to measure the modulation 
> percentage, didn't know that it really should be done, and didn't care about 
> it at all!  The owner of the second shop admitted that he knew the modulation 
> should be checked, but he didn't bother to measure it.  The owner of the third 
> shop actually did measure the modulation percentage, at least at times. When 
> asked how he did this measurements, he told me that he had a meter, that had 
> been built by a former employee, several years before.  He had absolutely no 
> idea how it worked, it had not been calibrated since the employee quit, but he 
> did use it, at times!  Needless to say, we rigged
> up a test jig and did our own checking!
>
> After putting the radio back in the airplane, we called the FAA tower for a 
> "radio check".  The controllers were very familiar with how the radio sounded 
> before and could not believe that it was the same radio.  Out of several 
> hundred general aviation aircraft hangered / tied down at the airport, the 
> controllers said that it was the best "sounding" of them all!
>
> They requested that the airplane be taxied over to the tower so that each 
> controller could come down and actually see what had been done and ask 
> questions.  That was done. The controllers were amazed that just by getting a 
> mis-wired component replaced, and then by changing the microphone, that such a 
> drastic improvement could be made.  It was "mentioned" that maybe a "talk" 
> should be had at each of the radio shops.  But, since I didn't have anything 
> to do with those shops, I don't know if anything came of that.
>
> Glen, K9STH
>
> Website: http://k9sth.net <http://k9sth.net/>
>
>
> On Thursday, September 25, 2014 10:53 PM, Peter Gottlieb <nerd at verizon.net 
> <mailto:nerd at verizon.net>> wrote:
>
>
>
> I've had better luck, not only getting diagrams but having them save gear for me
> that they would have discarded.
>
> I guess it really varies.  I've run into shops that had such a bad attitude I
> wouldn't bring work there.  Ask around with aircraft owners.
>
> PEter
>
>
> On 9/25/2014 11:46 PM, Bruce Gentry wrote:
> >
> >
> >
> > -------- Original Message --------
> > Subject:    Re: [Milsurplus] OT ?
> > Date:    Thu, 25 Sep 2014 23:40:18 -0400
> > From:    Bruce Gentry <ka2ivy at verizon.net <mailto:ka2ivy at verizon.net>>
> > To: nerd at verizon.net <mailto:nerd at verizon.net>
> >
> >
> >
> > As a collector of older aircraft radios, I have had aweful luck with
> > avionics shops.  They are often so full of themselves their noses are so
> > high in the air as to be a hazard to navigation. I hope and trust there
> > are also good decent ones around that might help you. I tend to resort
> > to EPAY.  One caution- aircraft radio manuals are often broken into two
> > or more very compartmentalized manuals.  Ask the seller  about EXACTLY
> > what is in the manual you are about to buy. I have bought manuals,
> > waited for them, and when they arrived, found the diagram or schematic I
> > desperately needed was not included.  The seller gushed with apologies
> > and assured me they would be glad to provide supplement XKZX-7492, for
> > a "nominal" fee, of course!  Buyer, be hyper aware!
> >
> >      Bruce Gentry, KA2IVY
> >
> >
> >
> > On 9/25/14 11:21 PM, Peter Gottlieb wrote:
> >> Do you have or use a plane?  If so, ask at the avionics shop.
> >>
> >> Peter
> >>
> >> On 9/25/2014 10:05 PM, Skywarrior via Milsurplus wrote:
> >>> Hi all,
> >>> I am looking for a wiring diagram for the commercial Cessna ARC 1000
> >>> RT-1038A VHF aircraft radio.  I need to make a wiring harness to
> >>> connect the control head.  I have had no luck finding such through
> >>> many searches.
> >>>
> >>> TIA
> >>>
> >>> Bruce
> >>> ______________________________________________________________
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> >
> >
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