[ARC5] which modules?

[Mike Hanz]

On 6/24/2014 8:41 PM, Jay Coward via ARC5 wrote:

> Mike, Dave, and Group,
>   Now I am confused (again!).
> I am looking at C-29, C-30, and C-30A.
> C-29 has a 4 position Tx selector switch with a "blocking" attachment to prevent position 4. This indicates a 3 Tx set with no ability to select position 4.  VHF, if that Tx was included in the system, has no channel selection capability.
> C-30 (pushbutton box) can select by default TX 1 VHF with pushbutton ABCD channel selection or pushbutton Tx 2 (HF) or Tx 3 (HF). and OFF. Yes it is fragile for a fighter pilot in the heat of combat.
> C-30A has the functionality of the C-30 but "look" of the C-29. The Tx selector is limited to two positions by a similar to C-29 "blocking" attachment. Since the paint is chipping and no indication of which Tx rotary switch position is for VHF, I'll assume (and I know the definition) that position 1 is VHF and that VHF rotary channel selector ABCD switch is in circuit. That would conform to a 2 Tx install, one VHF and one HF.
>   Am I missing something?

#1)  The small black lacquered sheet metal blocking attachment was 
intended to "personalize" the particular system installed in a given 
aircraft.  You really need to ignore it for purposes of understanding 
the *system* capabilities.  It was simply a cheap method to avoid GI 
fiddling.
#2)  What is particularly irritating about the C-30 is the habit of the 
pushbuttons to act like #3-48 screws - they get lost in the most 
inconvenient places.
#3)  According to the ARC-5 manual, for the C-30A it apparently does not 
matter which transmitter number you assign to the VHF set.  It will 
recognize it and enable the channel switch accordingly.

> So, could the C-29 support a VHF capable system? Probably *not* unless there was some other box to provide channel selection to the VHF set.

An excellent conclusion. :-)

> Having not yet investigated, I assume (again!) the VHF Rx channel selection is tied to the Tx channel selection circuit.

Yes.  It would be very unfortunate to have a receiver and transmitter on 
uncoordinated frequencies...

>   I am looking forward to retirement so I will have the time to "do" this hobby!

If you are counting on that, then you may be somewhat surprised...:-D

73,
Mike

> -----Original Message-----
> From: Mike Hanz <aaf-radio-1 at aafradio.org>
> To: David Stinson <arc5 at ix.netcom.com>; arc5 <arc5 at mailman.qth.net>
> Sent: Tue, Jun 24, 2014 12:29 pm
> Subject: Re: [ARC5] which modules?
>
>
> On 6/24/2014 9:48 AM, David Stinson wrote:
>> ----- Original Message ----- From: "J Mcvey via ARC5"
>> <arc5 at mailman.qth.net>
>> Subject: [ARC5] which modules?
>>
>>
>>> which modules do you use?
>>> I guess the c-29/ c-30 transmitter control are a given,
>>> but what is the difference between them?
>> C-30 was designed to operate the radio configuration
>> that incorporated the AN/ARC-5 VHF pair within
>> the existing and most common 2 TX - 3 RX deployment.
> Dave gave a good rundown on the C-30's purpose, but just to confuse
> things further, there was the original C-30/ARC-5, and later a
> C-30A/ARC-5 that was issued to correct a number of problems with the
> first version.  BuAer Technical Note No. 93-44 announced availability of
> the C-30-A in the September 1945 issue of Airborne Radio Maintenance
> Notes, though the pub number suggests that it was in the pipeline for
> some months before the ARMN issue.  The most significant problem with
> the C-30 was loss of the phenolic pushbuttons and breaking of the shafts
> that the pushbuttons slid over.  The C-30 and C-30-A basically added a
> second layer of switching to the C-29 to permit control of four channels
> on the VHF transmitter and receiver when it was selected as one of the
> four possible transmitter alternatives on the other switch.  By the time
> the C-30 came out, the Services were beginning their transition to VHF
> for command functions, so it made sense to simply install a C-30, (or
> later, the C-30A) rather than installing a C-29 and then have to change
> it out.  You could still use the C-30/30A to control four transmitters,
> just like the C-29.
>
> Your other question was about the C-39/C-48 interphone box, and I sure
> wouldn't consider it essential.  It was designed for multiple place
> aircraft, and allowed the choice of two different microphones, e.g.,
> oxygen mask mike and hand held mike, as well as a local volume control.
> It functioned simply as an audio jack box.  It was designed to be daisy
> chained with others.  The standard interphone box was, as AB5S
> suggested, either the J-16/ARC-5 or J-22/ARC-5 - the latter coming in
> two versions.  The manual describes the somewhat arcane details of each,
> but any of them will do fine for a ham radio set.
>
> 73,
> - Mike
>
>
>
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