[ARC5] J-17 and J-17A/ARC-5

[Mike Hanz]

The J-17 mount (MT-85/ARC-5) is a special plate that is unique to the 
J-17/J-17A, Jay.  Not much to it - just a rectangular hunk of .063" 
aluminum and four longer tail snap slide pin rivets with spacers to lift 
the junction box off the mounting plate by an eighth inch or so to 
eliminate condensation forming between the two aluminum plates of the 
assembly.  Figure 8-59 in the manual has the dimensions.

As to where it was used, it was most likely a matter of particular 
aircraft designer preference, rather than number of crew members.  
Figure 8-55 has a number of sample configurations, and when you get a 
component count above a certain level, it would make sense to use the 
J-17 rather than cobbling up one of the generic aircraft junction boxes 
(which will work perfectly well, too.)  There's actually nothing to 
prevent a designer from using it with a single receiver and interphone 
amplifier installation, or anything in between...just a question of cost 
tradeoff.

On 6/21/2010 9:56 PM, jcoward5452 at aol.com wrote:
> -----Original Message-----
> From: jcoward5452 at aol.com
> Sent: Mon, Jun 21, 2010 6:53 pm
> Thanks Mike and also for the C-39 "where used". Now how 'bout a where used on
> the J-17*/ARC-5? I would guess large crewed aircraft only. Heck you need a slew
> more connectors!  Looks like a modulator mount would secure it or was it a
> plate?
>
> -----Original Message-----
> From: Mike Hanz<aaf-radio-1 at aafradio.org  <mailto:aaf-radio-1 at aafradio.org>>
> To: Discussion of AN/ARC-5 military radio equipment.<arc5 at mailman.qth.net  <mailto:arc5 at mailman.qth.net>>
> Cc:jcoward5452 at aol.com  <mailto:jcoward5452 at aol.com>
> Sent: Mon, Jun 21, 2010 2:15 pm
>
> The RL-9 and AM-40 have somewhat less gain than the RL-5 and RL-7. The switch
> simply accommodates that difference in gain to produce roughly the same
> amplifier output level. The other changes to the -A model of the J-17 are
> described on page 33 of the manual.
>
>
> On 6/21/2010 3:39 PM,jcoward5452 at aol.com  <mailto:jcoward5452 at aol.com>  wrote:
>
> >  I have a J-17/ARC-5 junction box that I plan on adding in to my setup along
> with an RL-7 interphone. I just watched the J-17A/ARC-5 auction on the eplace
> and was interested in the photoes showing a switch to select RL-9/AM-40/AIC or
> RL-5/RL-7.From the photos it appears to be switch an r/c circuit.Is this correct
> and why?
>