[TenTec] din connector, etc.

[Bob McGraw - K4TAX]

The Eagle turn-a-round time, TX to RX is 20ms.  Same as for most other 
radios.

The ARRL QST review is incorrect, however the RSGB review is correct.

73
Bob, K4TAX



----- Original Message ----- 
From: "Mike Schatzberg" <cherokeehillfarm at earthlink.net>
To: <k9yc at arrl.net>; "Discussion of Ten-Tec Equipment" 
<tentec at contesting.com>
Sent: Thursday, September 25, 2014 2:33 PM
Subject: Re: [TenTec] din connector, etc.


> So if the ARRL lab test is correct, and the RF delay is 17 ms on the 
> Eagle, then time to settle receiving again is 70-17=53 ms.
>
> The TS 590S total turn around is only 20 ms.
>
> If you want to break into the transmission, you would have a harder time 
> to do so with the Eagle transmitting. Normally you could tap one dit or 
> two to break back in.
>
> What do the keyboard folks do to break a transmission?  Hit the letter E? 
> More than once?
>
> 73,
>
> Mike
> W2AJI
>
>
>
> Sent from my iPhone
>
>>> On Sep 25, 2014, at 3:12 PM, Jim Brown <k9yc at audiosystemsgroup.com> 
>>> wrote:
>>>
>>> On Thu,9/25/2014 9:02 AM, Roy wrote:
>>> I operate everyday from 35 wpm to 45 wpm with QSK amplifiers. With the 
>>> built-in Eagle keyer, transmitted weight is perfectly adjustable 
>>> internally and with an external key or keyboard, weight is also 
>>> perfectly adjustable using the weight controls on the external keyer to 
>>> compensate for truncating effect of  the 17ms. And again, of course 
>>> Eagle works QSK with QSK amps.!!!
>>
>> Thinking more about this -- the ARRL scope traces compare the RF output 
>> of the rig with the keying signal. This is NOT the same as the output of 
>> a power amp being keyed by the radio.
>>
>> I think we need to define a QSK amplifier. There is more than one way to 
>> do it. The original Ten Tec way -- you key the Titan and the Titan keys 
>> the radio. The limitation of this setup is that the rig must have a very 
>> short delay on the RF signal. All amps, including the Titans, accept a DC 
>> keying signal (either a DC short or +DC). As Rick has noted, amps with 
>> vacuum relays switch very quickly, and can follow keying to fairly high 
>> speeds.
>>
>> And there's also the matter of what does the operator listen to in order 
>> to decide if his keying is being shortened. If he listen to sidetone in 
>> his headphones, that is generated in the rig, and does NOT accurately 
>> represent the actual output of the rig or the amp. It's only what he's 
>> TRYING to send with his keyer or key. To hear what we are ACTUALLY 
>> sending, we must listen on a second radio (with no antenna connected and 
>> the RF gain turned all the way down)!
>>
>> Looking at ARRL test reports for the Eagle and the TS590S -- the "TX to 
>> RX turnaround time" for the Eagle is 70 msec" and 20 msec for the 590. 
>> So, as Rick noted, at high keying speeds we're not going to hear between 
>> the dits, even barefoot. For both rigs, there's no shortening of the dits 
>> in full QSK at 60 wpm, and if the key signal to the power amp is 
>> coincident with the keying signal to the rig, an amp with a vacuum relay 
>> or diode switching should reproduce the keying waveforms, while an amp 
>> with open frame relays is likely to hot switch (unless there's a speedup 
>> circuit).
>>
>> 73, Jim K9YC
>>
>>
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