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

Tue Dec 18 13:15:39 EST 2012

After those early experiences in the late 50's at other hams homes Ive made 
it a point to not duplicate ever again.

----- Original Message ----- 
From: "Francesco Ledda" <frledda at att.net>
To: "'Geoff'" <geoffrey at jeremy.mv.com>; "'Mike Everette'" 
<radiocompass at yahoo.com>; "'ARC-5'" <arc5 at mailman.qth.net>
Sent: Tuesday, December 18, 2012 12:37 PM
Subject: RE: [ARC5] 18S-4 Now and Later - Control box circuitry

> 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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