KAT500 tune on qsy configuration

[Cady, Fred]

Hi KAT500 gurus,
I'm trying to understand the KAT500's Tune on QSY configuration tab.

The way the KAT500 works is if you have "trained" it so that it knows the L-C combinations needed for a particular frequency on a band, when you return to that frequency it can simply recall those values by doing a "quick memory recall tune" without going through the full retuning process. If you have trained the KAT500 for all the frequency segments in a particular band, as you qsy up and down the band it will do the quick memory recall tune instead of a full tune if you have the Memory Recall Tune on QSY (for MAN and AUTO modes) checked in the Tune On QSY configuration tab.

Example: Set the frequency to 3500 and tune the KAT500 for that frequency. Change to 4000 and tune there. Now the L-C values for both frequencies are stored in the tuner's memory. Now as you switch from one frequency to the other, at the first burst of RF the tuner recalls the L-C values from memory and quickly tunes to the new frequency settings. That's if the Memory Recall Tune on QSY is checked.
If Memory Recall Tune on QSY in Mode Auto is not checked, the tuner enters a tune cycle (which actually does a quick memory recall tune and if that doesn't work then enters a full tune cycle).
If Memory Recall Tune on QSY in Mode Man is not checked, the tuner does nothing and shows high SWR.

Whew, long winded introduction, but my question is, "Why would you NOT want Memory Recall Tune on QSY checked?" Seems like having it checked is the fastest way to get to the new tuner settings if it has tuned up on that frequency before. And if it hasn't tuned up on that frequency before, it will if you are in Auto mode.

Cheers all.
73,
Fred KE7X

Fred Cady
fcady at ieee dot org

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[Don Wilhelm-4]

I would turn it off if changing to a new antenna.  You don't want it to
autotune with the old values.
Turn it back on after 'training' the tuner to the new antenna.

73,
Don W3FPR

On 9/21/2013 11:42 AM, Cady, Fred wrote:
> Whew, long winded introduction, but my question is, "Why would you NOT want Memory Recall Tune on QSY checked?" Seems like having it checked is the fastest way to get to the new tuner settings if it has tuned up on that frequency before. And if it hasn't tuned up on that frequency before, it will if you are in Auto mode.
>

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[daleputnam]

The memory remembers what the setting/tuning is per freq... but doesn't take care of the second, third or fourth wire antenna being fed on the same freq.The ant1 - ant2 works well for just two antennas on the same freq, but say you have a directional set of LB, and a directional set of HB (split at 20m,for this example) with a 6 pole coax switch outboard towards the antennae from the tuner... then the memory doesn't do anything but slow you down in antenna changes.

Have a great day,
 
 
--...   ...--
Dale - WC7S in Wy
 
 

, "Why would you NOT want Memory Recall Tune on QSY checked?" Seems like having it checked is the fastest way to get to the new tuner settings if it has tuned up on that frequency before. And if it hasn't tuned up on that frequency before, it will if you are in Auto mode.
>
>
     
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[Dick Dievendorff-3]

Initially the tuner did not retune on in-band QSY. Then we added in band memory recall tune on in-band QSY. We thought most of our owners would want that, but I guessed that there might be a good reason for a few users to prefer the old behavior. So I provided a mechanism to turn off the "improvement".  
In cases where you are not using a KPA500 and a retune requires a couple of transmissions, why abandon an acceptable ATU setting if you move a bit down the band unless poor SWR is actually encountered?

Dick, K6KR

>> "Why would you NOT want Memory Recall Tune on QSY checked?"
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[alsopb]

Dale,

I agree.

Autotuners for many of us who do frequent fast search and pounce can
indeed slow things up.  The last thing you want when trying to pounce on
a rare one (before the mob arrives) is to have the amp off line-- even
for half a second.

The best tuner is none.

A bunch of fixed component tuning networks, one per antenna might be a
practical alternative if one can live with the bandwidth.  L networks
are easy and pretty cheap to make.  I have an manually tuned L network
box here that I use to find out what values of L/C are needed.  I think
those who are fortunate enough to have a KAT500 might be able to use it
to determine needed values.  Can the KAT500 values of L/C and whether an
antenna side or rig side cap is required be read out?

If one has engineered a complex system of antennas like yours, then why
not also engineer a flexible, programmable solution that automatically
handles the needed fixed networks as a function of user input (if any),
mode, antenna and frequency.  Tune the antennas for the most frequently
used mode and switch in networks when required for other
modes/frequencies.  This is quite practical (for HF) with even a el
cheapo PIC and some relays.

73 de Brian/K3KO

On 9/21/2013 16:00, Dale Putnam wrote:

> The memory remembers what the setting/tuning is per freq... but
> doesn't take care of the second, third or fourth wire antenna being
> fed on the same freq.The ant1 - ant2 works well for just two antennas
> on the same freq, but say you have a directional set of LB, and a
> directional set of HB (split at 20m,for this example) with a 6 pole
> coax switch outboard towards the antennae from the tuner... then the
> memory doesn't do anything but slow you down in antenna changes.
>
> Have a great day,
>
>
> --...   ...-- Dale - WC7S in Wy
>
>
>
> , "Why would you NOT want Memory Recall Tune on QSY checked?" Seems
> like having it checked is the fastest way to get to the new tuner
> settings if it has tuned up on that frequency before. And if it
> hasn't tuned up on that frequency before, it will if you are in Auto
> mode.
>>
>>
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[alsopb]

A lot of the need for a tuner here would vanish if the KPA500 could
handle a 2.5:1 SWR.  Phone->CW band excursions could be tolerated
without exceeding that limit.   I've looked at the voltages and currents
involved.  At 500 watts, they don't intractable.

I wonder if the incremental cost would be around the price a KAT500?
Call it a KPA500+.

73 DE Brian/K3KO

On 9/21/2013 17:00, Dick Dievendorff wrote:
> Initially the tuner did not retune on in-band QSY. Then we added in band memory recall tune on in-band QSY. We thought most of our owners would want that, but I guessed that there might be a good reason for a few users to prefer the old behavior. So I provided a mechanism to turn off the "improvement".
> In cases where you are not using a KPA500 and a retune requires a couple of transmissions, why abandon an acceptable ATU setting if you move a bit down the band unless poor SWR is actually encountered?
>
> Dick, K6KR
>
>>> "Why would you NOT want Memory Recall Tune on QSY checked?"
> ______________________________________________________________
>


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[Rick WA6NHC]

That would only be effective on antennas that are mostly resonant in the
chosen band(s) which many designs do not allow.  Not everyone uses a
resonant antenna for a variety of reasons (HOA, space limitation).  (I have
HOA limits but hide a 104 meter EDZ wire.)  Otherwise a narrower ranged
tuner could be employed, negating the need for something as robust as the
KAT500.

It is also beyond the range of most solid state amplifiers.

Given that it matches a wise range of mismatches, I think that they have
done well.

73,
Rick wa6nhc

-----Original Message-----
From: Brian Alsop

A lot of the need for a tuner here would vanish if the KPA500 could
handle a 2.5:1 SWR.  Phone->CW band excursions could be tolerated
without exceeding that limit.   I've looked at the voltages and currents
involved.  At 500 watts, they don't intractable.

I wonder if the incremental cost would be around the price a KAT500?
Call it a KPA500+.

73 DE Brian/K3KO

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[Don Allen]

The K160RX kit adds the 160 meter band and a receive antenna switch to
the K2.  Brand new still in the original packaging with assembly and
operating instructions.

$28, including shipping via First Class Mail within USA.

PayPal OK.

73
Don W9CW
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