sundance-communications.com/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems PA System in 1A2--401A?

I'm going to second that you DO NOT want to send your intercom's tip and ring directly into ANY input of an amplifier. Although the intercom talk path is fed by the KSU's "A" filtered talk battery @24 volts, DC, it is still going to be upward of 10-12 volts when a station is off-hook. You'll fry the paging amplifier's input port in no time.

The 600 Ohm input on a paging amp is not designed for anything over 2-3 volts. It "sounds" like it might work on a telephone line because 600 ohms is often mentioned in telecommunications dialog, but ohms and voltages are two different vegetables.

If you can find an ITT 401-PA card, this will give you what you are really seeking.

Aside from a 401-PA card, as others have said, you can use a standard 400 series CO line card in conjunction with any industry-standard external paging adapter, such as those made by Melco, Valcom, Viking or Cooper/Wheelock. These will provide the proper talk battery feed needed to interface with a standard line card and couple it safely to an amplifier.

The WMT-1 is going to kill the battery on the T/R that you need to supply the phones that you need to page from. There needs to be an isolation cap to block the DC. If you look at the Melco KA-390 schematic, it's basically a transformer and it has a cap in series with one side of the T/R input.

I suspect that the 600 ohm amp input will have the same problem.

-Hal

Thanks for everyone's help in this. I gathered that what I was trying to do isn't going to do what I had hoped. I going to get a Melco KA-390 and I think that'll be exactly what I need.

Ed, would a University Sound TM-2 (with a power supply/cap wired in like you had me do years ago) work? I have several extras.

Sure, that would work, Jeff. It might be more trouble than to just use a packaged paging adapter like the Melco unit mentioned earlier. It basically does the same thing when coupled with a filtered DC power supply and a blocking capacitor.

Hi, I have the same issue, looking for a simple way to connect an unused line button (locking screw removed) from a key set to a PagePac Amplicenter.

I came across this Valcom product and was wondering if this would work (I found others, but they required you to dial # or an unused intercom number to connect to amplifier). PAGEPAL® V-5335700 (https://www.pagepac.com/pdfs/pagepal.pdf) .

The installation guide says "(SA) Station Access Used with a standard (ANALOG) station port on a CENTREX, PBX, Key System or Central Office subscriber line. Use a two-wire RJ11 cable in this mode. The PagePal receives talk battery and ring voltage from the host system". Thought I could connect to the manual intercom card. Any thoughts if this will work?

I just found some on Amazon and another vendor, around $525.00 - seems pricey!

After more researching, looks like the Melco KA-390 is the best option... Now to find one! I remember reading there was a WE KTU for paging, but never found the BSPs. Anyone know anything about this? I only need for 4 inside speakers for my home. Thanks!!

You can always scroll through here to see if anything suits your needs:

https://www.telephonecollectors.inf...paging-ktus-1985-brochure-practices/file

THIS WILL DO EVERYTHING YOU NEED and then some. You don't even need an intercom card in order to use it; just wire the line key's tip/ring to this unit and let 'er rip. It even comes with one paging horn. Give this manual a look and if you like it, it's readily available through Viking's on-line store or many other sources.

Thanks Ed, I read up on the specs; there is one item I'm trying to avoid, which is to dial a code before making the page. This unit requires a user to dial 1 first. My system is for a residence, where I want anyone to push the button on the phone that says 'Page' and speak. From what I read the University Sound TM-2 specs connect the phone's T&R to the paging system, nothing else required. I'm still researching - who knew anything could be so complicated! Thanks for finding the Viking PA-2A.