Base Alliance HD-73 Refresh

RT431 · Oct 20, 2019

Send it to me. I'll put it to good use.

Hurricane145 · Oct 24, 2019

That's okay. It's done and there if you need it.
I have three of them in various states of disrepair still. I got all the parts together just the other day. I am retired now so not much excuse! I forgot about this thread until I just saw it now!

Thanks for bumping it up!

RT431 · Oct 24, 2019

I had an Alliance HD73 yrs ago, but sold off most of my equipment when my first wife passed away.

W4KVW · Oct 24, 2019

I had one many years ago & I had Norm's Rotor Service rebuild & service it.He did the job in Trade for an Extra control box that I owned.A local friend still uses it today & it still works well.I went to a YAESU G-800SDX in place of the HD-73 & love it.

SIX-SHOOTER

Bernie Skoch · Feb 1, 2020

357 said:
Now the pain in the ass part.
The potentiometer for the dirction needle needs to be alligned.
When you line the notch in the gear ring, the pot needs to be all the way to the left or right to where it stops, then spin the motor gears by hand and while rocking the "pot" gear, keep checking for slack in it and rotate the ring gear so the slot lines up with the outside the the stop lever, lift the ring gear and rotate the pot gear so that its all the way full stop, then wire the rotor to the control box and start turning back the other way from where the full stop was on the pot. Keep going from the S all the way 360 to the other S on the control box.
Slide the stop lever to the other full stop position and slowly inch the slot back to the tit, while rocking the pot gear to make sure it doesn't come to the end of its travel.

It should line up again with the slot and the center of the stop lever, you get about a "tooth" of overshoot on the pot on each full rotation left then right, if you dont you got to lift the side of the ring gear and position the pot gear to give 1 tooth of overshoot.

When you have gone full rotation both ways a few times and the needle is lining up and the pot gear isnt binding, put the to cover on.

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Thank you very much for all of this! I was able to rebuild and reassemble my HD73 thanks to your outstanding directions.

357 · Feb 3, 2020

Bernie Skoch said:
Thank you very much for all of this! I was able to rebuild and reassemble my HD73 thanks to your outstanding directions.

n1dec · 2026-06-02T19:36:47+0100

I just got my old HD-73-1 down from the attic. Haven't used it for years. I might sell it or save it. I powered it up and found the Nylon gear with metal pinion was cracked so it wasn't driving the metal pinion gear under it. Had to get one from Norm. Expensive! Then I see the rotor position pot was dirty so I opened it up and cleaned it and found Its a wire wound! Looked like I was in there once before! So now I was at a loss on how to put it back together until I found this! Somehow when I was younger I could put things like this back together with no problem. But now that I am 77 its a chore!

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Base Alliance HD-73 Refresh

RT431

In the swamp

Hurricane145

Well-Known Member

RT431

In the swamp

W4KVW

ICOM 7610 HEIL FIN,ICOM 9100 EV RE320,ICOM PW-1

Bernie Skoch

New Member

357

Walkin' the dog

n1dec

New Member

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