[Elecraft] KAT500 as a remote-controlled tuner

[Walter Underwood]

Here is a US map of "County Level UV Exposure Data for the Continental United States”. The desert southwest is the clear hotspot. If you look carefully at California, you can see the effect of altitude in the Sierra. That area has higher UV than the coastal areas. The page also has an Excel data file of county-level data.

https://gis.cancer.gov/tools/uv-exposure/ <https://gis.cancer.gov/tools/uv-exposure/>

wunder
Walter Underwood
wunder at wunderwood.org
http://observer.wunderwood.org/  (my blog)

> On Nov 3, 2018, at 5:44 PM, ANDY DURBIN <a.durbin at msn.com> wrote:
> 
> I live in AZ so I know what UV does.  What I don't yet know is if the KAT500 is smart enough to inhibit tuning with an  input power level high enough to damage the L C switching relays.
> 
> 
> If the answer is no then the obvious follow up is  - why not?
> 
> 
> if the answer is yes then a keying inhibit is not needed to protect the KAT500.
> 
> 
> Andy, k3wyc
> 
> 
> 
> 
> ________________________________
> From: Jack Brindle <jackbrindle at me.com>
> Sent: Saturday, November 3, 2018 12:58 PM
> To: ANDY DURBIN
> Cc: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] KAT500 as a remote-controlled tuner
> 
> The keying interrupt must be provided by the ATU in order to avoid hot switching the ATU relays when it tunes. This cannot be determined anywhere but in the ATU, thus it must provide the break.
> That key line break is pretty important to the life of the ATU.
> 
> Jack, W6FB
> 
> 
> 
>> On Nov 3, 2018, at 12:17 PM, ANDY DURBIN <a.durbin at msn.com> wrote:
>> 
>> "Someone asked me recently whether a KAT500 could be remote-controlled"
>> 
>> 
>> It wasn't me that asked but I have been considering using the KAT500 as a remote tuner as I need higher power capability than my current MFJ-993BRT.  However, my approach was going to be to buy just the KAT500 board and find/build a suitable enclosure.  I'm a bit surprised Elecraft does not offer the KAT500 board packaged as a weather resistant remote tuner.
>> 
>> 
>> As to needing AUX cable and keying interrupt -
>> 
>> 
>>     - KAT500 does not need AUX cable to operate but if you want to help it along it's far better to give it the TX exact frequency rather than just the band.
>> 
>>    -  What other remote tuners provide keying interrupt?  In any event, the SWR seen at the remote tuner could be quite different from the SWR seen at the amplifier and may not be a good indication of whether the amp should be keyed.
>> 
>> 
>> The keying interrupt should be based on SWR seen at the amplifier output.  I actually already have that wired using my LP100A.
>> 
>> 
>> 73,
>> 
>> Andy k3wyc
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