Folks, I got the Lysco 600 working OK. I was also fortunate in that
whomever had it for these intervening years treated it well. But, on
the the NC-183D. A previous owner elected to install a product detector
in a typical plug-in can and is inserted into the NBFM adaptor socket.
The receiver-phone switch was borrowed for the selection of the new
detector and the old and new detectors, or so it would appear. Although
it works, I'd like to get it back to stock. If it the switch was the
only issue, it'd be easy but there are other obvious changes. Does
anyone have any info or pointers to where this, or similar,
modification(s) may have been written up? I'm going to proceed and
trace out as best as possible but I'm always wary of removing some
critical wire, someplace, that may cause a loss of operation, in the
process. I'll of course document any reverse actions so I can follow the
breadcrumbs back, if necessary. But... if someone has the key....

73 de Jeep/K3HVG

On Nov 25, 6:12 am, K3HVG wrote:
Folks, I got the Lysco 600 working OK. I was also fortunate in that
whomever had it for these intervening years treated it well. But, on
the the NC-183D. A previous owner elected to install a product detector
in a typical plug-in can and is inserted into the NBFM adaptor socket.
The receiver-phone switch was borrowed for the selection of the new
detector and the old and new detectors, or so it would appear. Although
it works, I'd like to get it back to stock. If it the switch was the
only issue, it'd be easy but there are other obvious changes. Does
anyone have any info or pointers to where this, or similar,
modification(s) may have been written up? I'm going to proceed and
trace out as best as possible but I'm always wary of removing some
critical wire, someplace, that may cause a loss of operation, in the
process. I'll of course document any reverse actions so I can follow the
breadcrumbs back, if necessary. But... if someone has the key....

73 de Jeep/K3HVG

Why would you want to remove a good working product detector ,#1 The
phono switch is never used,#2 the accessory socket was placed there
just for changes and additions #3 someone else may own it at some
time later and would appreciate a good product det. #4 If it can`t be
seen and it works good,why bother? I do seem to remember some
articles on this subject,,,You might go on line to Electric Radio and
follow the directions to the index of past issues,most likely find
it .. GL Harold/ W4PQW

Why would you want to remove a good working product detector

Well, that's something to consider. I can only add that I collect and
restore (or have a try at it, anyway) these oldies to their respective
original condition/configurations. I suppose I could let this
particular unit, as-is. I did find that the ER article, same subject, is
apparently not the mod done, here. But, as I said, point taken.....

K3HVG wrote:
snip on
the the NC-183D. A previous owner elected to install a product detector
in a typical plug-in can and is inserted into the NBFM adaptor socket.
The receiver-phone switch was borrowed for the selection of the new
detector and the old and new detectors, or so it would appear. Although
it works, I'd like to get it back to stock. If it the switch was the
only issue, it'd be easy but there are other obvious changes. Does
anyone have any info or pointers to where this, or similar,
modification(s) may have been written up? snip
73 de Jeep/K3HVG


Hi,

May 1964 QST had a product detector for the HRO receiver NBFM socket.
(I presume that is similar to to the NC-183D NBFM socket).
The article was by Loren Windom (of "Windom antenna" fame).

73,
Ed Knobloch

K3HVG ) writes:

Why would you want to remove a good working product detector

Well, that's something to consider. I can only add that I collect and
restore (or have a try at it, anyway) these oldies to their respective
original condition/configurations. I suppose I could let this
particular unit, as-is. I did find that the ER article, same subject, is
apparently not the mod done, here. But, as I said, point taken.....

ANd realistically, the mod was made at the time the receiver was current,
or shortly after. That's when someone had an AM receiver they wanted to
use on SSB, so it made sense to modify it.

Decades later, people are less likely to modify rigs, since at this
point keeping them "pristine" is more important to them than actually
using the equipment.

Michael VE2BVW

Hi,

May 1964 QST had a product detector for the HRO receiver NBFM socket.
(I presume that is similar to to the NC-183D NBFM socket).
The article was by Loren Windom (of "Windom antenna" fame).

73,
Ed Knobloch

Sometime in the 1960's or 70's I bought a similar kit at the old
Portland Radio store in Portland Oregon. I installed it in a National
HRO-60. Worked good, as I remember. I don't have a clue as to who put
the kit together. It was a commercial enterprise of some sort. It was
one of several kits in bags on a rack.

I would vote to just leave it in the radio along with any information
you may discover, or a schematic you might draw out.

My $0.02 worth!

Paul, KD7HB