[ARC5] Unknown control box

[Moe Fretz]

​
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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