Collins PM-2 Power Supply

[K4FY]

The lightweight, PM-2 supply meant to attach to the KWM-2 requires hardware specific to that task, but is no longer available. Thus far, I have been unable to locate that hardware from alternate sources or find a suitable replacement at the local ACE hardware store. Any ideas?

[WA9SVD]

The lightweight, PM-2 supply meant to attach to the KWM-2 requires hardware specific to that task, but is no longer available. Thus far, I have been unable to locate that hardware from alternate sources or find a suitable replacement at the local ACE hardware store. Any ideas?

It would help if you would describe the particular "hardware" needed. Screws? nuts? connectors?

[K4FY]

I see what you mean. Sorry for the confusion. It's a "Nuts and bolts" situation to fasten the power supply's rails to the chassis of the kWM-2. It looks like Collins originally supplied a thumb screw assembly that screwed into a tapped assembly that mounted on the chassis.

I fear the likelihood of locating that hardware is somewhere between finding the Holy Grail or hitting the Florida Lotto.

[K9STH]

Check McMaster-Carr, they have virtually everything!

http://www.mcmaster.com/#

Glen, K9STH

[KE3WD]

Check McMaster-Carr, they have virtually everything!

http://www.mcmaster.com/#

Glen, K9STH

This is a very good starting point.


Very good idea to ascertain the thread and screw sizes needed here before looking for the captive hardware parts. Would most likely be SAE of 6-32, 8-32 or perhaps one of the finer threads. A single "try" screw can be used, if it hand threads into the existing socket without problems or binding, then that is the proper size.

Do not overlook the Collins User Group (google for the url) as those guys 'n gals likely already know the sizes, perhaps know where to get replacement screws, etc. -- and may likely be a source to get your hands on some originals as well.


73

[K4FY]

Many thanks all. You've put me on the right track.

73,
Gary K4FY

[K9STH]

The threads of the connectors that are on either side of the Collins KWM-2- series transceivers are 10-32.

Glen, K9STH

[K4FY]

For anyone struggling to find hardware to secure a PM-2 power supply to the KWM-2, I may have found a solution. I used a half inch long, 3/8” Cap Screw with a matching nut and washer. The hex drive cap screw neatly fits through the KWM-2 side cabinet hole. Then I added a washer against the PM-2 brackets and feed cap screw through the chassis to the nut. It’s a tight fit on the left side, but it does fit. It assembly seems secure and cosmetically it’s quite acceptable.

I picked up the hardware at ACE Hardware. Strangely, the Allen wrench supplied with Insink-erator garbage disposers fits the cap screw perfectly.