[Elecraft] More KAT500 PTT Questions

[iain macdonnell - N6ML]

Well, it does actually say this in the manual:

"In AUTO mode, if you QSY such that the SWR rises above 1.8:1 the
KAT500 will automatically retune
when you transmit on the new frequency. The KAT500 will open the key
line to disable your amplifier
briefly until the tune cycle is completed. The new frequency and
settings are stored in memory."

That 1.8:1 threshold is configurable, per-band ... and the opening of
the keying line during auto-tune is the part that can be problematic
for some types of amplifier, so further conditions are being
considered....

73,

    ~iain / N6ML



On Mon, Nov 5, 2012 at 1:59 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:
> OK, that is a revelation to me.  Sorry that I did not read that in the
> manual.
> I stand down in light of more informed designers and testers..
>
> 73,
> Don W3FPR
>
> On 11/5/2012 4:31 PM, iain macdonnell - N6ML wrote:
>> That's not true, Don... the KAT500 *will* auto-tune if/when VSWR
>> exceeds a (configurable, per-band) threshold.
>>
>> A lot of consideration is being put into different ways of handling
>> "hot-switching" situations with various types of amplifiers. The
>> currently-posted provisional manual may not be reflective of the final
>> result of this consideration.....
>>
>> 73,
>>
>>      ~iain / N6ML
>>
>>
>>
>> On Mon, Nov 5, 2012 at 1:18 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:
>>> Ed,
>>>
>>> The KAT500 is not *that* automatic.  It will not automatically re-tune
>>> even if it senses a high SWR.  You must tell it to tune. Once it has
>>> been tuned to each antenna and bend segment, returning to that set of
>>> tuning parameters is automatic - just go to that frequency and antenna
>>> and the proper tuning will be recalled.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>> On 11/5/2012 3:41 PM, Ed G wrote:
>>>> or will PTT open whenever the KAT500 senses a high SWR and retunes, even if
>>>> on the same band? It would be impractical for me to anticipate KAT500
>>>> retuning when moving into a new band segment and try to shut down the amp
>>>> per the procedure on page 13.
>>>>
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