[ARC5] 18S-4 Now and Later - Clarification

[Meir WF2U]

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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