Thanks for replying.
On Tue, 7 Jan 2025, 04:29 Bob Wilson, N6TV, <n6tv@arrl.net> wrote:
> Page 50 describes the TS-690S VOX "hang time", which is not the same as TX
> Delay (Delay between amplifier keying and RF output). I'm not sure what
> you are trying to change, but since you posted this to the Amps group, I
> assume you are keying amplifier relay and want to make the RF delay longer
> to prevent hot-switching.
>
You're 100% correct
> To key an amplifier with the TS-690S, you have to set Menu 16 (Linear Relay
> Keying) to ON. Unlike modern radios, the TS-690S does not seem to
> provide any adjustment to increase the TX delay between Linear Amplifier
> Relay Keying and actual RF Output.
>
Thank you for clarifying.
>
>
> According to the April 1992 QST Review written by NJ2L (now K2UA) posted
> here:
>
> https://ts450s.at.ua/_ld/0/5_TS-450_QST_Revi.pdf
>
> the TS-450S (which has a similar TX circuit to one found in the TS-690S?),
> appears to have a fixed TX Delay of about 10 to 12 ms of TX Delay, with
> shortening of the keyed element (60 WPM keying 20 ms key down time). See
> Fig. 3 in that document.
>
This is quite surprising. I've overbuilt my T/R relay box somewhat with
these huge open relays, but they do take 20ms (measured) to close. It is
surprising I've managed not to burn anything yet while using these with the
Kenwood's 10~12ms delay only.
> If your amplifier T/R relay is really slow and requires more delay between
> T/R relay closure and RF Input to prevent hot-switching, I recommend
> disabling VOX. Key the PTT *Input *of the TS-690S with a footswitch or
> logging software or a WinKey that allows you to specify whatever TX Delay
> you need before it keys any CW, so that the rig's PTT input is keyed, and
> the amplifier T/R relay is closed, much sooner than the RF output.
>
> The TS-690S has multiple PTT inputs, including REMOTE jack Pin 3 ("for
> footswtich") and MIC jack Pin 2.
>
Thanks
73,
Łukasz -SP4IT
>
>
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