Skilifts.org / SORT Forum

Selling sound powered phones and parts as a lot.

20 phones
15 elements
5 switches
4 cords

Most parts are used, some are new. Cords have various plug ends. Not sure of status of phones. Selling because I went with a different system. $1000.00 for the lot.

Shawn72, on 11 February 2015 - 08:51 AM, said:

Which system did you go for?

Just some regular phones with a 12Vdc power supply in line. Picked the power up off of 1 of my 24Vdc batteries. Clear and reliable.

Shawn72, on 12 February 2015 - 04:29 AM, said:

Yup - the only down-side is that they must all be in series.

Emax, on 13 February 2015 - 08:27 AM, said:

Not exactly. One phone at top and three at bottom. As long as top is off the hook, all work. Power source in line to top.

Shawn72, on 14 February 2015 - 05:33 PM, said:

What about a mid-station? It may want to call either direction.

Emax, on 15 February 2015 - 01:13 PM, said:

no mid station

Shawn72, on 17 February 2015 - 04:44 PM, said:

OK - that works. But for an equipment vendor, it presents a problem. Normally open hook switches and shorting jacks are possible solutions - but still there is the series thingy. Maybe it's OK.

We use standard 2554 wall phones with amplified handset which makes it great for noisy places like motor houses or under the drive terminals. To provide the "talk battery" we have built a small box to house the terminal strip, LED indicator, a fuse holder, and a small voice transformer. The transformer is a 600 ohm to 600 ohm transformer with the one 600 ohm winding split, NOT center tapped. You place a 1uf capacitor across the split of the winding and feed your 24 volts filtered DC across the split as well. 12 volts DC will work but it seems that the 24 volts is better. "Tip" and "Ring" for the telephones comes from the main leads of that winding on the transformer. The capacitor maintains the 600 ohm impedance for the audio and the split coil provides the loop current needed for the talk circuit. The non split winding, or secondary winding, is not used. It is simple and straight forward and the phones get hooked up to the circuit just as if it was a standard phone line. No need to worry about series circuits or any other special switches or such.

Steve

INTERESTED IN BUYING THE SOUND POWERED PHONES DO YOU HAVE A PHONE NUMBER I CAN CONTACT YOU AT. PLEASE EMAIL ME AT TCOTTAM@ANGELFIRERESORT.COM

TCOTTAM, on 26 August 2015 - 05:47 AM, said:

I tried to email you and it bounced back. My email is "kplifts@purityspring.com".

The ansi code states reliable communication. What if you loose your 24v supply. It is a plausible scenario.

Yes loosing the 24v supply is possible. We use the 24v source that supplies the control voltage. As long as you have your control voltage source (batteries and chargers) you have communications.

timberlaker, on 23 October 2015 - 06:23 PM, said:

First, ANSI is not a "code" - it is a standard.
Second, based on experience, sound-powered phones are not very reliable ... subject to a multitude of failures.
Standard analog telephones are much more reliable - even if powered by system voltage.

In a day with radios and cell phones I would argue that a 24 V system is plenty reliable and if you don't have control voltage you've got larger problems than communication...

Just reach out and touch someone!

Code: a set of rules and standards adhered to by a society. We are forced to adhere to said Standard are we not? Semantics some may say. It is Halloween why not split some hairs. Either way this is the classic Po-Ta-Toe vs PO -tay-toe issue. If cared for Sound powered phones are reliable. I have had both but have always inherited the Viking type not the aforementioned method so in all fairness I should give the aforementioned method a try.

We use 6V telephones with no problems. I'm curious to how the sound powered phones operate?

Why the sound pressure from hour voice causes a diaphragm to move a conductor through a magnetic field and creates current. That current then travels to the other end of the lift where the reciprocal happens. Except your ear is on the diaphragm at the other end.
Would you be kind enough to post a link to the supplier of your 6v phones?

We use the Econocom phones.
WWW.metragenll.com/hardwire_intercoms.html
Christine Carnovale is our Rep there.