[Elecraft] New KAT500 pics from the Visalia DX convention

[Dick Dievendorff]

We weren't using high power at Visalia.  There are different opinions about
whether 500 W is too much for a BNC connector, but the point is moot; the
connectors on the KAT500 are all SO-239 UHF connectors.

Power needs haven't been specified, but we have a number of 12V relays that
want 30 mA and one that needs 60 mA.  I'm hoping we can keep the overall
power limit to 2A max, but 1A may not be attainable.

There will be a pull-to-ground to initiate tune mechanism on the AH-4
connector.  

However we really need to interrupt the amplifier key line during tuning, or
you'll have to do it yourself to tune.  Some of the ATU's ability to protect
itself from damage in the event of severe mismatch and high power depends on
the ability to inhibit the amplifier through the amp PTT/key line.

The ATU is bypassed and ANT1 is selected when powered off.

Right now I depend on a power off pushbutton to save some transient state,
but I think I want to do it periodically anyway (saving only if it's
changed) so that if you make a change and wait a few seconds we won't lose
that state across power off. 

New tune results are of course saved for retune. We have a lot of EEPROM for
saving tune results. 

Dick, K6KR

  

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of ab2tc
Sent: Tuesday, April 24, 2012 2:45 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] New KAT500 pics from the Visalia DX convention

Hi,

Yes, but the cables are BNC terminated cables connected via adapters from
the looks of it it. Not in my shack either, but that is beside the point.
More questions: How much current on the 11-15V supply? Is the "tune" button
a simple switch to ground? You know what I am getting at. I want to mount
this fellow outdoors in a weather protected shelter and remote it. I have
been doing that successfully with an MFJ auto-tuner for more than 3 upstate
NY winters and it's still going strong. I think my "house" can accommodate
the KAT500 with some rearranging. Assuming that the tuner will switch to
bypass when losing power, all I need is the ability to initiate a tune
cycle. I assume that the tuner can be put in semiautomatic mode (only tunes
on demand) and will remember the mode across power cycle. I am drooling
already. The MFJ tuner performs adequately but has a 200W limit and is
somewhat temperamental when it comes to finding a tuning solution. An Eham
reviewer of it claims that they have wired the 4 LSB bits for the relays
backwards. I find it hard to believe but it often fails to find solutions on
easy to tune antennas (I have 6 behind an MFJ remote switch box).

AB2TC - Knut


Gary Gregory wrote
> 
> Rick,
> 
> Maybe you need another coffee?...:-)
> 
> Look pretty much like SO-239's to me....
> 
> Gary
> 
> On 25 April 2012 06:18, Rick Bates <happymoosephoto@> wrote:
> 
>> Did I see BNC adapters?  For THAT much energy?  Not in my shack...  
>> ;-)
>>
>> It's time to replace the drool pads again...  patience patience
>>
>> Rick wa6nhc
>>
>> On 4/24/2012 12:50 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
>> > New KAT500 pictures on our news page:
>> > http://www.elecraft.com/news.htm
>>
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> 
> 
> --
> Gary
> VK4FD - Motorhome Mobile
> Elecraft Equipment
> K3 #679, KPA-500 #018
> Living the dream!!!
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