[ARC5] 18S-4 Now and Later - Control box circuitry

[Mike Everette]

Some time in the distant past I've seen a USAF manual on the 18S-4.  Seems as though I recall that the control box for the ART-13, and in particular the one for the ART-13B model which has not only the 10 position channel switch but also an A-B toggle switch -- easily added to a non-B head -- to give a total of 20 channels, is a very close (if not exact) match for the transmitter control circuitry.  The receiver control circuit is probably dip-simple, with a gain control or two (RF-AF, maybe ganged like in the BC-348), a BFO switch (if the thing works CW, and I forget whether that is) and a phone jack.  And let's not forget the mic jack and a pilot lamp.  That should get you going.

If you intend to run it on the dyno, I'm betting you will probably give that idea up very quickly once you hear it wind up the first time.

73

Mike
W4DSE

--- On Wed, 12/12/12, Meir WF2U <wf2u at ws19ops.com> wrote:

> From: Meir WF2U <wf2u at ws19ops.com>
> Subject: Re: [ARC5] 18S-4 Now and Later - Clarification
> To: "'Mike Morrow'" <kk5f at arrl.net>, "'ARC-5'" <arc5 at mailman.qth.net>, "D. Platt" <jeepp at comcast.net>
> Date: Wednesday, December 12, 2012, 10:53 PM
> Well, I received the beast by UPS
> today... I was double boxed the proper
> way; the inner box is the original depot shipping carton
> (the unit was
> refurbished in 1978). I'm pleasantly surprised: except for
> some minor dings
> on the case, it is almost pristine inside. The 811's and the
> 813 are a bit
> dusty, but the chassis, all the wiring and the components
> look very clean.
> It's fully populated with all the receive/transmit crystals
> (all 20
> channels). I can make a list of all the frequencies in the
> TX section, maybe
> there is a way to find out what airlines had some company
> frequencies,
> besides the standard aeronautical HF channels. The crystals
> range from just
> under 3 MHz up to 18 Mhz. I found an original manual online
> at Abe Books
> (Jeep, thanks, but now I don't need a copy...). In fact, I
> found a 618S-1
> manual as well - which I needed - in the same store.
> I'm still searching for the remote and the shock mount, but
> it may be a long
> time before I can snag either or both of them... It
> shouldn't be a big deal
> to build a remote just to put the radio on the air. Good
> project for the
> winter!
> 
> 73, Meir WF2U
> Landrum, SC
> 
> 
> -----Original Message-----
> From: arc5-bounces at mailman.qth.net
> [mailto:arc5-bounces at mailman.qth.net]
> On
> Behalf Of Meir WF2U
> Sent: Tuesday, December 04, 2012 12:16 PM
> To: 'Mike Morrow'; ARC-5
> Subject: Re: [ARC5] 18S-4 Now and Later - Clarification
> 
> Another thought: a Kiwa filter module can be inserted in the
> IF chain, with
> no impedance matching needed, and due to the in-out built-in
> amps, there is
> no insertion loss. It needs 4.5 - 36 VDC for power. Easy fix
> for the 18S-4!
> 
> 73, Meir WF2U
> 
> -----Original Message-----
> From: arc5-bounces at mailman.qth.net
> [mailto:arc5-bounces at mailman.qth.net]
> On
> Behalf Of Mike Morrow
> Sent: Tuesday, December 04, 2012 11:52 AM
> To: arc5 at mailman.qth.net
> Subject: Re: [ARC5] 18S-4 Now and Later - Clarification
> 
> I wrote:
> 
> > The 18S-4 and the 18S-4A are identical except for the
> Collins 455 kHz
> mechanical
> > filter used on the output of the receiver mixer into
> the IF chain.
> 
> I should have finished this sentence as "...the IF chain of
> the 18S-4A".
> 
> Mike / KK5F
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