[ARC5] ARC5 and ART13

[Fuqua, Bill L]

  Wow, I forgot that I have an interesting homebrew transmitter in the garage.
It is a homebrew rack mount 80 meter AM transmitter with an ARC5 transmitter with a shortend 
chassis for the VFO, an 813 modulated by a pair of 811s. I did notice a small bit of FMing on the 
carrier while modulating.  I had to use the BFO to hear it. It was not noticable when the BFO was 
turned off.
  I think some ART 13 parts were involved. I recalled measuring the output at just at 100 watts
and the modulator worked just fine with a crystal mike.  It is a sort of merger of the two
sets. I have not seen it for some time now but it is still there.
   73
Bill wa4lav

________________________________________
From: arc5-bounces at mailman.qth.net [arc5-bounces at mailman.qth.net] On Behalf Of Mike Hanz [aaf-radio-1 at aafradio.org]
Sent: Monday, October 17, 2011 5:55 PM
To: ART-13_Transmitters at yahoogroups.com
Cc: W5API CHUCK; ARC5 at mailman.qth.net; milsurplus at mailman.qth.net
Subject: Re: [ARC5] [ART-13_Transmitters] Re: Homebrew ART-13 mounts

On 10/17/2011 3:21 PM, J. Forster wrote:
>
> There is certainly some market for a few mounts and other things,
> especially for the more popular sets like the ARC-5 & SCR-274-N. Things
> like control box mounts come to mind. Original ones are nearly impossible
> to find, and when they do show go for a lot of money. I recall one C mount
> going for well over $125 in the last year or so on eBay. (I didn't get
> it).
>

The only person that I know of who has set up for the ATA/274N/ARC-5
mounts was kb4dmf.  His replications were flawless, and immensely
reasonable...I have a couple of them myself!  He has a lot on his plate,
so I don't know if he's produced a run of control box mounts or the
shock mounts lately.

> Years ago, I did some sheet metal work, and have watched A&P masters who
> worked for me making spacecraft bits, like electronics boxes. These guys
> could make perfect welds on 0.025" thick Aluminum!
>

Yeh, I watch them work and am always impressed.  It is an art form that
must be practiced frequently to maintain proficiency.  It's certainly
not a gift that I possess.  The ones that *really* amaze me are the guys
that do it with gas welding!  They make it look so simple, and my
fumbling attempts always reflect the difficulty level of what they are
doing so easily.

> FWIW: It seems for most pieces, it would take little additional effort to
> make a few dozen, if you have to make one. The reason is that setting
> stops on shears and brakes- the setup work- has to be done for one or a
> score parts. Once a machine is set up, you can crank out parts all day, if
> you have the patience. That's certainly what was done in WW II. Each
> manufacturing station did only one thing, like make a bend.
>

No question about it, John.  I personally don't have the patience to
make more than one or two - that's the reason I try to describe the
"gotchas" for those who might want to try just a single reproduction.

> Now, there are additional options. With CAD, one could easily draw these
> things up and have a few hundred cranked out by a sheet metal shop w/ NC
> presses. All identical, all just like the original.
>

Absolutely!  The catch is always the setup fee!

> Also, manufacturing is nopt exactly booming right now. Maybe some shops
> could use some "fill-in" work?
>

It would take someone with the drawings to get quotes.  Taking the part
into the shop is an option, but one will pay for the translation into
CAD.  In the final analysis, it's all about the economics.

Just my random thoughts,
Mike

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