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

Tue Dec 18 12:37:03 EST 2012

Is it worse than the T-195?

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of Geoff
Sent: Tuesday, December 18, 2012 11:13 AM
To: Mike Everette; 'ARC-5'
Subject: Re: [ARC5] 18S-4 Now and Later - Control box circuitry

Anyone wanting to be in the same room with a running ART-13 dyno has to be
either deaf or a masochist.

> 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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