atcomsystems.ca/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems ITT 501C Intercom

Well, I disconnected everything from Every AB/AG terminal on the KSU. I don't have a butt set, so I hooked a 2500 between AB and AG..... and got ...buzz.

So, I guess it is the power supply. But I almost think this is a result of the design of this KSU, as it doesn't have seperate filtered/and unfilterd (AB and BB) supplies. When I had my old intercom card in, there was no hum on the T&R terminals, so it's like they built some sort of filtering into the intercom card itself, since the KSU didn't provide it. Then again, I thought AB & AG were supposed to be the filtered ones... so I'm lost again.

Matt -

Keep your eyes peeled on ebay for a power supply - or - whenever you go into an office buildings tel closets keep your eyes open for any abandoned ones. I can't speak for KC, but in NYC every 3rd closet in an old building has an abandoned (JUST MAKE SURE IT REALLY IS ABANDONED) power supply.


Sam

OK - will do. I know there is the same KSU I have on ebay right now, no cards, or interrupter, but it has the PS and ring generator. Maybe I'll go throw a bid at it just for parts.

Thx!

Matt

Matt----just perusing this thread.....is this KSU really an ITT 601 shoebox? I still maintain one of these beasts.

:rolleyes:

I'n not far from you.....drop me a line and we'll see what we can do for you.

Edited to correct my inability to read the whole thread.......

Ed is on the button. Still, drop me a line....may have some of what you need.....or an ITT 512 full of goodies !!!!

Cool! Thanks Ken!

Yep, it's a 601. And after the ordeal listed in this post... I know one heck of a lot more about it now then I did a week ago.

Where I'm really gonna need some help is mounting some 66 blocks and cross connecting over to the KSU. Right now I terminate on the KSU itself, but I can see this isn't gonna work for much longer. I've read about the blocks, but it makes my head spin.

In other news - I've gotten rid of the hum on the intercom line problem.

As I'd said, when I was using my old non functional intercom card, I did get clean voice capability, just no volts/amps to the signal output. So I went down, put the old intercom card back in, used it's Tip (or was it Ring)? I don't remember. Anyway, it had 24v on it. So I connected that to the A battery input on the intercom, and used my AB output from the KSU to drive the B battery on the intercom.

Now I've got buzzing, illuminated hold lamps on intercom use, and a clean, no hum intercom voice path. I don't see any issues with this, as there are no connections made anywhere now (other than the tip or ring) on the intercom section of the block. I guess I essentially made my own AB output.

Man, if I still drank, I'd go have a beer. Instead, I'll have to settle for walking the dog.

:thumb:

Matt, the 66 block is no big deal....especially if you have access to the ones that take up to six connections.

Then you use one cable from the KSU to the block. Makes for easy changes, less mess.

Well, If you ever plan on being out Lee's Summit way, I'll get all the materials together, maybe you could help me mount it all up so it looks professional and is up to spec. I think that's whats always amazed me about the wiring closets I've seen - didn't have a clue how they worked... but man, the professionalism in em was beyond words. Kinda like when I used to see the old knob and tube wiring in the basement of a house where it hadn't been hacked apart yet and turned into a fire just waiting to happen.

I think I could grasp the technical concepts behind it with some help, but I need someone to teach me the way to route the wires properly, around what I think they call 'mushrooms', down to the blocks, etc.

Dinner/Lunch/whatever you want to eat/drink at wherever you want to go is on me. Or if you want to be paid for your time/travel, that works too. Or both. Would be great to just spend some time chit chatting as we work, would love to hear some of the stories I'm sure you have to tell.

It's going to be a little while, I've got to round up some more amp. cables - right now I've only 2 keysets, but plan on going to 6.

I only have 2 CO lines, but want to wire each station for all 4 (5 is now intercom), so if I do get another line, I can punch it down in one place.

Thanks again,
Matt

Matt:

I don't know why I didn't think of this earlier, but I do have the intercom card and TT adapter in stock if you are interested in trying it out to do a sanity check.

Ed -

That's OK. I really like the unit I got from Sam, it gives me a beep beep beep when I buzz another station. I'll let ya know if I ever wanna go complete stock someday. I'm 99% sure there are one or more bad relays on it; I noticed signal outputs 1, 2 and 3 ALWAYS have 10v on 'em, 4,5 and 6 get 10v when you press a button, and 0,7,8 and 9 never have any volts present. Still, the relays do click for each corresponding button pressed. I looked up the relays, and they go for around $29 a pop; so I won't be going down that road anytime soon (as in... this lifetime). Thanks for the offer though!

- Matt