Re: [Elecraft] K3 Auto ATU Problem

2021-12-07 Thread Michael Carter
Tom, I'm going to go out on a limb here, but hey, it's only a virtual limb! I am going to withdraw my previous statement that the K3 SWR bridge is operating correctly. Given what you've said, the ATU control algorithm is receiving bad information from the SWR bridge. Here's how to test this hypo

Re: [Elecraft] K3 Auto ATU Problem

2021-12-07 Thread Rick Bates, NK7I
The KAT3, KAT500, KPA1500 tuners, all have the same feature.  I have all three. If you want a finer (lower SWR) value, within a few seconds of the first tuning cycle stopping, start the sequence a second time and the tuner will cycle through ALL possible settings to attempt a lower match.  It

Re: [Elecraft] K3 Auto ATU Problem

2021-12-07 Thread Michael Carter
Aye, Tom - you've given us a good puzzle to solve! Back to looking at the schematics, possibly opening up my K3 to do direct visual inspection. What, if any, options do you have installed in your K3 (including KPA3 100 watt PA)? 73, Mike, K8CN

Re: [Elecraft] K3 Auto ATU Problem

2021-12-07 Thread Fred Jensen
The KAT500 will enter a fine-tune mode if you re-initiate a tune cycle right after the first one has finished.  I don't know if the KAT3 will do that, and I can't test it because mine always finds the primary match the first time, but Elecraft would have a lot of incentive to reuse KAT3 algorit

Re: [Elecraft] K3 Auto ATU Problem

2021-12-07 Thread CUTTER DAVID via Elecraft
Sounds like you are in need of a choke somewhere or a grounding issue. David G3UNA > On 07 December 2021 at 13:26 Tom Boucher wrote: > > Tom > > I've found that pressing tune again, immediately after a tune sequence > sets it off to do "fine tuning" which might help. > > David G

Re: [Elecraft] K3 Auto ATU Problem

2021-12-07 Thread Tom Boucher
*TomI've found that pressing tune again, immediately after a tune sequence sets it off to do "fine tuning" which might help.David G3UNA* Thanks David - yes I've tried that, but it still ends up with a poor indicated SWR. Also cleaned up and tightened the screwed pillar in the KAT3 corner, tightene

Re: [Elecraft] K3 Auto ATU Problem

2021-12-07 Thread Drew AF2Z
You can set TUN PWR in the K3 Config Menu to something other than 5 watts. 73, Drew AF2Z On 12/07/21 06:59, Tom Boucher wrote: Thanks NK7Z, NK7I and K8CN for responses. Dave and Rick indicated that running the K3 at a higher power level during the ATU Tune sequence might solve the problem how

Re: [Elecraft] K3 Auto ATU Problem

2021-12-07 Thread CUTTER DAVID via Elecraft
Tom I've found that pressing tune again, immediately after a tune sequence sets it off to do "fine tuning" which might help. David G3UNA > On 07 December 2021 at 11:59 Tom Boucher wrote: > > > Thanks NK7Z, NK7I and K8CN for responses. > > Dave and Rick indicated that running the K3 at a hi

[Elecraft] K3 Auto ATU Problem

2021-12-07 Thread Tom Boucher
Thanks NK7Z, NK7I and K8CN for responses. Dave and Rick indicated that running the K3 at a higher power level during the ATU Tune sequence might solve the problem however, as far as I can see, the power level is fixed at 5 watts during auto tune and cannot be altered. Mike, there is no problem wi

Re: [Elecraft] K3 Auto ATU Problem

2021-12-04 Thread Michael Carter
Tom, Does the problem you describe occur on each of the ANT1 and ANT2 ports on the KAT3 output when the ports are terminated in a good 50 ohm power load? Have you checked the K3 ANT selection when the KAT3 is installed to be sure that the port to which your 50 ohm load is attached is the one sele

Re: [Elecraft] K3 Auto ATU Problem

2021-12-04 Thread Rick Bates, NK7I
The KAT3 performs well at 10 watts, lower output levels may not get consistent results. Ditto the KAT500 and KPA1500 tuners. 73, Rick NK7I On 12/4/2021 8:58 AM, Dave wrote: Hi Tom, In your initial post, you failed to state the power level of your failed autotune event. Hence why my quest

Re: [Elecraft] K3 Auto ATU Problem

2021-12-04 Thread Dave
Hi Tom, In your initial post, you failed to state the power level of your failed autotune event. Hence why my question did not ask what the tuning level needed for the K3 to trigger was, but at what power level you were performing your failed autotuning event at. My thinking was that you m

[Elecraft] K3 Auto ATU Problem

2021-12-04 Thread Tom Boucher
Dave (NK7Z), The K3 performs its auto-tune sequence at a power output of 5 watts I believe. 73, Tom G3OLB __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto

Re: [Elecraft] K3 Auto ATU Problem

2021-12-02 Thread Dave
How much power are you using to trigger a tune operation? 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist, RFI ARRL Asst. Director, NW Division, Technical Resources On 12/2/21 09:08, Tom Boucher wrote: I'm wondering if someone can help with a K

[Elecraft] K3 Auto ATU Problem

2021-12-02 Thread Tom Boucher
I'm wondering if someone can help with a KAT3 ATU problem on my K3 S/No.01434? When bypassed, the K3 SWR indication agrees with that on an external SWR meter. This is also so when the KAT3 is replaced with a KANT3 board. When in AUTO mode it goes through its relay rattling sequence for each band,