Phone Systems

Previous Thread
Next Thread
Print Thread
Rate Thread
GTE AE Model 186 phone and PCI 4A speakerphone
#619558 05/06/18 02:22 AM
Joined: May 2018
Posts: 4
Member
OP Offline
Member
Joined: May 2018
Posts: 4
I have a GTE Automatic Electric Model 186 6-button keyset phone and Precision Components 4A speakerphone (108A loudspeaker and 608A transmitter plus a spare 608A) that were used by my supervisor at the time they were taken out of service a few decades ago. I have all the components including the 82A connecting block and a cord to go from the connecting block to an RJ11 jack. I can get dialtone in the handset or the speaker and can receive a call on either, but when I push the dial buttons I hear tones but the CO does not respond. It's possible that I'm getting single tones instead of dual tones, which I judge by comparing to the tones of a working SC2500, but my hearing discrimination may not good enough to tell for sure.

Two questions:

1) Does my hypothesis about the tones sound plausible? Any suggestions for checking this with a 'scope would be welcome. Is there a schematic for the Model 186 phone available anywhere?

2) Does this collection of equipment have enough value to warrant trying to diagnose the problem? I don't really have a strong desire to use the phone myself, but I'd like to clear it out of my storage and I'd rather not have it go to the landfill. Selling it would be a bonus. I see a 4A speakerphone on ebay and it does not even include the connecting block.

Telephone Equipment Search
Re: GTE AE Model 186 phone and PCI 4A speakerphone
Stephen Casner #619567 05/06/18 02:31 PM
Joined: Dec 2007
Posts: 6,407
Admin
*****
Online Thinking
Admin
*****
Joined: Dec 2007
Posts: 6,407


Dean
Photographs:
https://www.instagram.com/deanwilsoncanby/
https://fstoppers.com/profile/deanwilsoncanby
https://www.trover.com/u/3193463644

Please don't confuse your "Internet Search" with my licenses, certifications and over 30 years experience.

"Thank you for calling Technical Support. If you feel you have reached this number in error, please hang up and press redial."
Re: GTE AE Model 186 phone and PCI 4A speakerphone
Stephen Casner #619590 05/07/18 12:19 AM
Joined: May 2018
Posts: 4
Member
OP Offline
Member
Joined: May 2018
Posts: 4
Thank you for that pointer.

Re: GTE AE Model 186 phone and PCI 4A speakerphone
Stephen Casner #619630 05/08/18 01:37 AM
Joined: May 2018
Posts: 4
Member
OP Offline
Member
Joined: May 2018
Posts: 4
Using the schematic to hook up my 'scope I verified that the dial buttons were producing dual tones, not just one. Then using a spectrum analyzer app on my iPhone I discovered that the column frequencies were about 3.5% low, which is sufficiently out of spec to be ignored. The oscillator in this Touch Calling unit was built with inductors having a tunable ferrite core so I was able to adjust the frequencies within 0.5% of spec and now all the digits are signaled correctly. Thanks for your help.

Re: GTE AE Model 186 phone and PCI 4A speakerphone
Stephen Casner #619631 05/08/18 02:41 AM
Joined: Dec 2007
Posts: 6,407
Admin
*****
Online Thinking
Admin
*****
Joined: Dec 2007
Posts: 6,407
Dial tone is two tones DTMF or Dual-Tone Multi-Frequency

The correct frequencies can be found here: DTMF



Dean
Photographs:
https://www.instagram.com/deanwilsoncanby/
https://fstoppers.com/profile/deanwilsoncanby
https://www.trover.com/u/3193463644

Please don't confuse your "Internet Search" with my licenses, certifications and over 30 years experience.

"Thank you for calling Technical Support. If you feel you have reached this number in error, please hang up and press redial."
Re: GTE AE Model 186 phone and PCI 4A speakerphone
Stephen Casner #619814 05/12/18 08:33 PM
Joined: May 2018
Posts: 4
Member
OP Offline
Member
Joined: May 2018
Posts: 4


Moderated by  Touch Tone Tommy 

Link Copied to Clipboard
Forum Search
Most Recent 5 Post
sip inbound robo calls
by sentrex1 - 06/04/20 04:20 PM
CIXs, SIP trunks, centralized voicemail
by LarryH2 - 06/03/20 10:46 PM
Profile 2 SIP Trunks
by Coral Tech - 06/03/20 07:28 PM
MGI audio deteriorating
by Bushmills - 06/03/20 04:08 PM
TDE 200 Drop Calls
by chazrc - 06/03/20 04:02 PM
Who's Online Now
47 members (Silversam, hitechcomm, EV607797, RATHER BE FISHING, Curlycord, Bob-o, justbill, Carlos#1, ChrisRR, Mercenary Roadie, mongo5150, nortelvoip, newtecky, Touch Tone Tommy, dexman, MooreTel, sentrex1, JBean3329, nfcphoneman, Yoda, Keyset6, hbiss, jeffmoss26, Arthur P. Bloom, Professor Shadow, Bushmills, SSPhone, Daniel, dans, westerntelephone, KENB, Why Me!!!, pvj, Bob3470, Carl Navarro, Avidcomm, iatech3800, Memphisribs, seafort, KRRath, gelehu, ILE, Rok1215, metelcom, C5Z, erniejoey, helpifican), 483 guests, and 46 robots.
Key: Admin, Global Mod, Mod
Popular Topics (Views)
Forum Statistics
Forums94
Topics93,742
Posts635,980
Members49,292
Most Online5,661
May 23rd, 2018
Today's Birthdays
charlotte, Harry Smith, Ritztech
Newest Members
swoodsNI, B. Endsley, Abner Dawes, Gringo, Jeffrey Cohen
49292 Registered Users
Get Tech Support Now! Click the banner below
Get Tech Support Now!
EMP & Lightning Home Surge Protection
EMP - Click Here!
Top Posters (30 Days)
dexman 25
ChrisRR 11
ILE 8
Daniel 8
Bluewater Sailing
https://www.patreon.com/bePatron?u=5256033
EMP Shield for Commercial - Home & Vehicle
Use Coupon code SAVE - Click Here!
Servpro Ventura 24-Hour Emergency Service
Free Estimates call us now 24Hours
Contact Us | Telephone System Tech Support | Terms of Service

Sundance Communications is not affiliated with any of the above manufacturers.
©Copyright Sundance Communications 1998-2020
Trusted Partners