Re: KPA-1500 issues
Posted by
Don Wilhelm on
Nov 30, 2018; 2:48am
URL: http://elecraft.85.s1.nabble.com/KPA-1500-issues-tp7646571p7646657.html
Randy,
That indicates that you do not have your KAT500 and amplifier properly
connected.
The KEYOUT line from the transceiver should go first to the KAT500, and
then from the KAT500 to the amplifier.
When the KAT500 needs to tune, the amplifier will not be keyed and
tuning will take place at the power output of the transceiver.
After tuning, the amplifier will be engaged.
73,
Don W3FPR
On 11/29/2018 7:42 PM, Randy Farmer wrote:
> I've had difficulties with my KAT500 / KPA500 combo (only) on 160
> meters, apparently due to the tuner relying on RF sensing. I've
> carefully "trained" my KAT500 all across the 160 meter band. Since the
> manual states that the tuning bins are 10 kHz wide below 3 MHz, I do a
> tune at 1805, 1815 ... up to about 1895. My antenna is an impossible
> load above 1900 kHz, so I don't try to tune up there. Since I don't have
> exactly a great antenna system, I almost always stick to S&P operation
> in 160 meter contests. As I tune across the band I can hear the relays
> selecting the appropriate tuning solutions. But... every once in awhile,
> as soon as I key the transmitter I hear the relays in the KAT500 switch,
> presumably out of the commanded tuning bin due to frequency measurement
> error in the RF detection circuit. This shouldn't be a problem, since
> the tuning doesn't change significantly between adjacent bins. However,
> since the amp is being keyed while the tuner is changing presets, the
> amp immediately faults and goes off line. This is very annoying, and
> probably not so good for either the amp or the tuner. If the RF
> measurement resolution is really as poor as 8kHz, I don't see why
> there's any point in providing for 10 kHz wide tuning bins on the low
> bands. I would also strongly agree that if good frequency information is
> available to the tuner via the serial bus that's what it should use to
> select tuning bins. The RF sensing information should be a backup
> source, to be relied on only in the absence of such data.
>
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