[Premium-Rx] Questions about Watkins Johnson 8618B (S 1)

[stephous]

Hello Ben,

I can address the first and last paragraphs.


1) I have sealed NiCd replacement kits for your 8618B-(S1). They fit the in
the original "C" bracket. Comes with tubing and instructions. The battery is
located under the top cover near the front panel directly behind the Dwell
control. You un solder the old battery and solder the new one in it's place.
My batteries are epoxy sealed NiCd units that do not leak. I will say this
again: Many folks install other batteries that do not meet the original WJ
requirements. There are several very good reasons to replace the old battery
with an upgraded industrial NiCd. I keep finding junk batteries in radios
that I work on and replace them. Remember that depending on installation
type it can get very hot inside the case. Many radios are also left un
powered for long periods of time. Without getting into a discussion on
battery physics a sealed NiCd is the right choice.

Contact me off line if you want to buy a kit.


2) A sound card will have a typical impedance range of 10K to 20K ohms
depending on manufacturer. You can match the lines if you want. Why not
adjust the line output pot down to 1V p-p or are you already at the lower
limit?

Best Regards,
Steve

PCS Associates
949 Glenneyre Street
Laguna Beach, CA. 92651-2706
Phone: (949) 376-7844
FAX: (949) 376-7866
http://www.pcsassociates.net/
----- Original Message ----- 
From: "Ben Mesander" <benmesander at yahoo.com>
To: <premium-rx at ml.skirrow.org>
Sent: Saturday, October 21, 2006 4:25 PM
Subject: [Premium-Rx] Questions about Watkins Johnson 8618B (S 1)


> Hi,
>
>   I have a few questions about my Watkins Johnson
> 8618B (S 1). It appears the battery is dead for the
> memories. I would like to open it up, remove the old
> batteries so they do not leak, and make up a suitable
> replacement. Can someone clue me in on where the
> battery is, and what voltage it was?
>
>   Second, my COR functionality seems to be broken - if
> set to 2 or greater, it never unsquelches, even on VHF
> if a station pops up 60dB. Any advice on where to
> start looking?
>
>   I have the SSB option. I note a notch in the audio
> output around 1kHz -- is this normal or a problem with
> my unit?
>
>   Finally, I looked at the line out on a scope, and it
> appears to be about 10V p-p. The impedance is 600
> Ohms. I need to take that down to about 1V p-p for
> input into a computer soundcard or a modem. What is
> the nominal impedance of consumer level "line in" so I
> can design the proper PAD?
>
> Regards,
> Ben
>
>
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