[GreenKeys] TDD Frequencies

[Jeffrey Golas]

You can even find TDD hardware modems! Pretty sure theres still some on Ebay.

Jeff

> On Jun 4, 2026, at 10:24 AM, John Spigel via GreenKeys <greenkeys at mailman.qth.net> wrote:
> 
> Gavin, No worries. All is not lost. I can post on https://5bits.net an mp3 test file with Mark 1400 and Space 1800. I just need confirmation of baud. Some bell systems have 100wpm vs 60wpm. You then play the file on your phone.
> 
> 73, John W1AN
> 
>> On 04-Jun-26 05:52, Gavin Wuchter via GreenKeys wrote:
>> Welp lol, now I guess my question is does anyone know of a software modem or other itty thing that can output the original APCOM/PhoneType on 5bits.net 1400/1800 Hz Baudot tones?
>> Or in theory something that can slow down the audio to be slight lower pitch/frequency?
>> Just a thought trying to be somewhat cost effective for the equipment I already have.
>> Thank you for your help in the search!
>> - Gavin
>> On Thu, Jun 4, 2026 at 12:43 AM John Lawson via GreenKeys <greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net>> wrote:
>>    __ __
>>    Ooops: manual states Mark/Space as 1400/1800.____
>>    __ __
>>    Close, but no guitar…____
>>    __ __
>>    __ __
>>    Cheerz____
>>    John____
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