Your project reminds me of my Navy MAK transceiver, although the MAK is much older. Surprised to see that there are no tuned circuits between the oscillator and the amplifier and when operating on 3885 it may be possible to also be on 1942.5 if not careful.

Both radios were designed to operate into a short antenna with a big base coil and don’t know if they would be happy feeding a 50 Ohm load. Maybe it would be best to install a coaxial loop with a in and out before the switch for L1?

I have a huge Sunair backpack that’s both AM and SSB that was built for the USCG that has a coaxial loop so you can feed a 50 Ohm antenna or keep it connected for use with the side mounted whip antenna.

Think the issues is what your going to do with the radio when finished? I kept the MAK all set up for 12 volt DC operation with a solid state power supply and set it up on 3885 with the idea of using it in the field at places like Dayton with a short antenna. Because of the low power and that wide band nature of the receiver its not a real candidate for home operations although I have done a couple local QSO on 3885 with the radio. Somehow determined that if you can copy the station you want to work solid on receive that they tend to hear you.

Ray F/KA3EKH

From: [email protected] <[email protected]> On Behalf Of David Stinson via groups.io
Sent: Tuesday, October 26, 2021 1:08 AM
To: Boatanchors@mailman <[email protected]>; milsurplus@mailman <[email protected]>
Cc: Boatanchors@ThePorch <[email protected]>; MMRCG <[email protected]>
Subject: [MMRCG] Bendix Skipper 135: OOPS! and Opinions

CAUTION: This email originated from outside of Salisbury University. Please exercise caution when clicking links or opening attachments from external sources.

Remember the Bendix Skipper 135 Marine radio with the
High Voltage problem? Well, I think I have that sorted-out
and it wasn't the switching transistors; it caught a case of
the "oops." You know, voltage doublers work so much
better when you connect both electrolytics with the
proper polarity.... DOH!
I ran out of time (as usual) before I could correct it,
but I'll get back to it as soon as work lets go of my hair.

Anyways- here's the latest request for opinions.
I'm attaching the transmitter circuit diagram.

Reduced the five crystal channels to one on the diagram.
These rigs typically have movable taps on tank coils,
and loading coils (think of an ARC-5's roller),
one tap for each channel.
I don't want to fuzzle-around with swapping coil taps
and tuning caps with the PA "live" drawing excess current
while I "muddy the waters" looking for the right taps.
So here's the plan- I will disable the High Voltage, light
the tube filaments and use a signal generator to inject
3885 KC on the PA signal grid, connect the rig to a
50-ohm dummy load, monitor for the signal at the
load with a scope and move taps/tune caps for max
signal across the load. If it does the "Milrig" deal
where it won't tune 50-Ohms, a series cap will fix it.
That way, when I restore High Voltage, the rig
should be close to correctly tuned.
What do you think?

TNX OM ES 73 DE Dave AB5S

P.S. Grid dip meters are a non-starter.
I never have good results with those things.
In fact, I've given-away the ones I had.

This email has been checked for viruses by Avast antivirus software.
www.avast.com

_._,_._,_

Groups.io Links:

You receive all messages sent to this group.

_._,_._,_