Author Topic: European Phone Resembles an AE  (Read 266 times)

Offline Doug Rose

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Re: European Phone Resembles an AE
« Reply #15 on: May 23, 2020, 09:05:35 AM »
What is an induction handset?
dsk
http://www.classicrotaryphones.com/forum/index.php?topic=10377.msg110250#msg110250

It is amazing when I can find something in the archives!!  8) ...Doug
Kidphone

Offline Jack Ryan

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Re: European Phone Resembles an AE
« Reply #16 on: May 23, 2020, 10:55:58 AM »
The "PAX handset" was an induction handset according to our Forum AE Experts.....AE Collector and Stub....Doug

The AE PAX handset has a DC receiver but I am not suggesting that the ATEA handset has a DC receiver.

The AE PAX handset is physically different from a conventional POTS handset to distinguish it. The PAX handset should not be used on the public network because it has low sensitivity (cheaper) transmitter and in the case of the AE handset, a less than optimal anti-sidetone circuit and balance network.

I believe the ATEA PAX handset was also electrically different from the standard POTS handset and was physically different so that they were not used for the wrong purpose.

Jack

Offline dsk

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Re: European Phone Resembles an AE
« Reply #17 on: May 25, 2020, 04:52:04 AM »
I have another ATEA telephone with this handset but the tranmitter an receiver are capsules from Siemens typical for a Local battery telephone.   Here is a picture of the tranmitter still stuck in the bakelite. OB=LB (Local Battery)  If we look at the circuit, it is quite equal to the Siemens W48. The bridge circuit has a considerable leak of DC that may result in a LB transmitter when the line viltage is low.  Typical problem on 24V exchanges with long lines.
dsk
PS Yesterday I visited a fellow who has 2 of those phones, but not with that handset.   
He has many ATEA phones with that handset, and had never tought about any difference in the sound quality.  DS
« Last Edit: May 25, 2020, 05:14:00 AM by dsk »

Offline dsk

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Re: European Phone Resembles an AE
« Reply #18 on: May 25, 2020, 05:11:24 AM »
If you really want to use it, and the transmitter is bad, then you could modify it by putting in a capacitor and change to a typical North American transmitter. The ones used in WE 500/2500 etc should fit. AE transmitters should aloso do the job.

Try the transmitter before you modify, if you have enough juice in your line it may be no need for thet capacitor. 
The capacitor will redesigne the circuit to be more equal to what AE used. 

dsk

Offline LarryInMichigan

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Re: European Phone Resembles an AE
« Reply #19 on: May 25, 2020, 08:41:19 AM »
I have tried using a T1 transmitter and a known good typical German transmitter in this phone, but the sound from the transmitter was weak with both.  AE transmitters will definitely not fit.  I might try adding a capacitor as suggested, but I do not currently have any capacitors of that value here.

Thank You


Larry

Offline dsk

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Re: European Phone Resembles an AE
« Reply #20 on: May 25, 2020, 09:22:33 AM »
A 1 uF will probably do it reasonably well, more than 2 will probably not be to any more help than a 2 uF.  The voltage rating should at least be equal to the on hook line voltage.  Another testing trick may be to ad a 9V battery in series with the phone to rise the current, but just for testing. 

dsk