[ARC5] Unknown control box

Wed Jul 16 23:06:34 EDT 2014

May I ask once again, where was the original message on the panel found? I have a friend who has been doing avionics work for well over 20 years who might give a clue.

* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk at hotmail.com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
* * * * * * * * * * * 

> To: tubetester at gmail.com; SDAITCH at bbg.gov
> Date: Wed, 16 Jul 2014 20:55:18 -0400
> CC: arc5 at mailman.qth.net
> Subject: Re: [ARC5] Unknown control box
> From: arc5 at mailman.qth.net
> 
> 
> Looks easy enough to operate. Set frequency with thumb and forefinger. Thumb should be able to operate mode switch. Aircraft with sophisticated avionics usually
>  had heat so gloves not required except maybe Arctic/Antarctic conditions?
>  Not a pilot, just guessing.
>  Jay
>  
>  
> -----Original Message-----
> From: Moe Fretz <tubetester at gmail.com>
> To: Sheldon Daitch <SDAITCH at bbg.gov>
> Cc: arc5 <arc5 at mailman.qth.net>
> Sent: Wed, Jul 16, 2014 5:40 pm
> Subject: Re: [ARC5] Unknown control box
> 
> 
> 
> Here is one with more numbers on it.
> From this site about half way down.
> 
> http://morepicture.webs.com/
> 
> 
> 
> 
> $-------&
> Moe Fretz
> Collection and Preservation
> Canadian Tube Radios, Communication Equipment, Vintage Ham gear and
> Military Radios.
> Hallicrafters, RCA, National, Hammarlund,TMC, RME and Racal.
> 
> www.radiopreservationguy.com
> 
> Don't part them out ---- Restore them.
> 
> Cambridge
> Ontario Canada
> 
> 
> On Wed, Jul 16, 2014 at 7:24 AM, Sheldon Daitch <SDAITCH at bbg.gov> wrote:
> 
> >
> > Perhaps it is a prototype unit - I have no idea.  I understand the
> > ergonomics concern, but considering what appears to be the age of the unit,
> > maybe that wasn't a driving force at the time.
> >
> >
> >
> > Some semieducated guesses here.
> >
> > In many aircraft NAV/COM systems, the DME receiver is slaved off the NAV
> > radio frequency selection and there would be a need to torn the DME
> > function on or off.
> >
> > Slaving the DME transmitter/receiver off the NAV radio controller is both
> > a convenience factor and a panel space concern.  One less radio control to
> > have to deal with while in flight.
> > Most DME system frequencies are paired to VHF nav frequencies and if a DME
> > is located at a VOR facility, either VORTAC or VOR-DME, the DME system is
> > set up for that VOR frequency.  I seem to recall that some of the TACAN DME
> > frequencies can be used for DME but not all TACANs match the VHF/DME
> > frequency pairing.
> >
> > Yes, High/Low receiver sensitivity is used, as discussed below, with
> > marker beacons, but again, guessing here, I'd submit the High/low in this
> > case is the audio level from the DME receive side to the audio panel of the
> > aircraft so the pilot can monitor and verify the call sign of the DME
> > station.
> >
> > 73
> > Sheldon
> >
> >
> >
> >
> >
> >
> > -----Original Message-----
> > From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of D. Platt
> > Sent: Tuesday, July 15, 2014 7:57 PM
> > To: arc5 at mailman.qth.net
> > Subject: Re: [ARC5] Unknown control box
> >
> > In my humble opinion, its a control box, and probably a prototype at that.
> >  The reason I say proto is that the function switch is not human engineered
> > properly.  The knobs are way too close together and any ergo-engineer would
> > handily reject the design.  The fact that DME is even mentioned is arguably
> > for control purposes, only.  And, what does "DME off" mean?  Is it the R/T
> > unit or the audio ident? The low/stby and hi refers to what?  Selectable
> > low/high us usually relegated to the 75Mhz marker beacon receiver.  Now, it
> > may well be that the concentric freq knobs are the wrong ones.  If smaller
> > ones were used, maybe the selector switch would be OK?  Again, it screams
> > out to be a proto box as it does not comply with any standard ARINC label
> > or layout.
> >
> > Jeep - K3HVG
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