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txinh timing??

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Mark n2qt

txinh timing??

I've looked but can't find the spec on how long after after initiating TXINH
is the
K3 transmitter at zero power?

(I'm working on an so2r interface which can take away an antenna from the
low
priority rig even if it was transmitting. )

It looks like the TXINH is a polled input and may be a bit a slow for my
application.

Mark n2qt

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Mark n2qt

Re: txinh timing?? Measured

well I went and measured it.

Max time for RF carrier to zero after asserting TxInh (TxInh Hi) was just
under 10ms
minimum time was about 8ms.

So since I was set up to measure things, I measured the time for carrier to
decay (in Data
mode) after removing PTT and got pretty much the same times.

Mark n2qt

-----Original Message-----
From: Mark n2qt
Sent: Wednesday, April 25, 2012 5:05 PM
To: [hidden email]
Subject: [Elecraft] txinh timing??

I've looked but can't find the spec on how long after after initiating TXINH
is the
K3 transmitter at zero power?

(I'm working on an so2r interface which can take away an antenna from the
low
priority rig even if it was transmitting. )

It looks like the TXINH is a polled input and may be a bit a slow for my
application.

Mark n2qt

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Igor Sokolov-2

Re: txinh timing?? Measured

Thank you Mark.
I was looking for this information. Well.. it is very slow indeed. I thought
it is much faster.
Could you possibly measure how long does it take for the signal to appear at
the output after TX Inh set to low?

73, Igor UA9CDC

> well I went and measured it.
>
> Max time for RF carrier to zero after asserting TxInh (TxInh Hi) was
> just
> under 10ms
> minimum time was about 8ms.
>
> So since I was set up to measure things, I measured the time for carrier
> to
> decay (in Data
> mode) after removing PTT and got pretty much the same times.
>
> Mark n2qt
>
> -----Original Message-----
> From: Mark n2qt
> Sent: Wednesday, April 25, 2012 5:05 PM
> To: [hidden email]
> Subject: [Elecraft] txinh timing??
>
> I've looked but can't find the spec on how long after after initiating
> TXINH
> is the
> K3 transmitter at zero power?
>
> (I'm working on an so2r interface which can take away an antenna from the
> low
> priority rig even if it was transmitting. )
>
> It looks like the TXINH is a polled input and may be a bit a slow for my
> application.
>
>
> Mark n2qt
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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Mark n2qt

Re: txinh timing?? Measured

It's a little bit quicker, full power in about 7-8ms.

if anyone is interested in the pictures I took of the scope, email me
directly and I'll
send you a copy. (about 800k each)

Mark n2qt

-----Original Message-----
From: Igor Sokolov
Sent: Thursday, April 26, 2012 2:02 PM
To: Mark n2qt ; [hidden email]
Subject: Re: [Elecraft] txinh timing?? Measured

Thank you Mark.
I was looking for this information. Well.. it is very slow indeed. I thought
it is much faster.
Could you possibly measure how long does it take for the signal to appear at
the output after TX Inh set to low?

73, Igor UA9CDC

gm3sek

Re: txinh timing?? Measured

Mark n2qt wrote:
>It's a little bit quicker, full power in about 7-8ms.
>
>if anyone is interested in the pictures I took of the scope, email me
>directly and I'll
>send you a copy. (about 800k each)

How much of that 7-8ms is part of the normal rise time? The value most
people are looking for is the delay (if any) between release of txinh
and the onset of the normal rising edge.

--

73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek
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