[aprssig] Kenwood D700 Internal TNC Amazingly Mediocre!
Stephen H. Smith
wa8lmf2 at aol.com
Sun Aug 7 01:56:17 EDT 2016
On 8/7/2016 12:45 AM, Bill Vodall via aprssig wrote:
>> There was no digi involved in my test. I had the FT-1500/TT3 ammo-can
>> tracker, equipped with a Diamond 770 no-ground-plane half-wave whip, located
>> The discovery of how much poorer the D700's internal TNC was than the
>> Soundmodem soft TNC was purely by accident.
> We you using the FT-1500/TT3 with speaker/mic twisted audio and not
> flat discriminator audio?
> The Kenwoods are flat discriminator audio.
NO! The FT-1500 was being used exclusively on transmit -- it has a 6-pin
mini-DIN port providing more-or-less flat transmit audio.
Since the TT3 is a transmit-only device, the RX audio is irrelevant. The
mini-DIN dataport provides an actual 0/5 VDC COR/busy indicator that is far
more positive than the audio detect scheme normally used on a TT3.
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