wattmeter calibration
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I finished assembly except for PA last week and went through the
calibration sequences. I am not able to have the wattmeter on the K3 match the output reading on the Bird wattmeter. Any suggestions? 73 de todd WB2ZAB _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Todd brings up a good point. I ran out of range while calibrating at the 5W
and 50W level.. I got pretty close but ran out of adjustable range. Also, I am confused as to what is happening with the RF Gain Calibration procedure. The routine calls for setting power level at a pre-set level and running through the bands. But how is the value adjusted and saved ? And if TUNE is depressed later, are the saved values affected? Or, is it the fact that the RF Gain procedure is conducted while in CONFIG that the those settings are saved? It's just a very strange procedure and I don't understand how a relationship is established between the displayed power and RF Gain setting during setup. Can anyone explain? Tnx! Paul, W9AC ----- Original Message ----- From: "Todd Ruby" <[hidden email]> To: <[hidden email]> Sent: Sunday, March 16, 2008 10:09 AM Subject: [Elecraft] wattmeter calibration >I finished assembly except for PA last week and went through the >calibration sequences. I am not able to have the wattmeter on the K3 match >the output reading on the Bird wattmeter. Any suggestions? > > > > > 73 > de > todd > WB2ZAB > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > > -- > No virus found in this incoming message. > Checked by AVG. Version: 7.5.519 / Virus Database: 269.21.7/1329 - Release > Date: 3/14/2008 12:33 PM > > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Todd Ruby
I should also state that when I was calibrating my K3 wattmeter, I was
looking at three wattmeters in series -- an LP-100, Array PowerMaster, and Alpha 4510. Each wattmeter reads within 2% of each other into a Bird TermaLine load. Paul, W9AC ----- Original Message ----- From: "Paul Christensen" <[hidden email]> To: <[hidden email]> Sent: Sunday, March 16, 2008 10:34 AM Subject: Re: [Elecraft] wattmeter calibration > Todd brings up a good point. I ran out of range while calibrating at the > 5W and 50W level.. I got pretty close but ran out of adjustable range. > > Also, I am confused as to what is happening with the RF Gain Calibration > procedure. The routine calls for setting power level at a pre-set level > and running through the bands. But how is the value adjusted and saved ? > And if TUNE is depressed later, are the saved values affected? Or, is it > the fact that the RF Gain procedure is conducted while in CONFIG that the > those settings are saved? It's just a very strange procedure and I don't > understand how a relationship is established between the displayed power > and RF Gain setting during setup. Can anyone explain? Tnx! > > Paul, W9AC > > > ----- Original Message ----- > From: "Todd Ruby" <[hidden email]> > To: <[hidden email]> > Sent: Sunday, March 16, 2008 10:09 AM > Subject: [Elecraft] wattmeter calibration > > >>I finished assembly except for PA last week and went through the >>calibration sequences. I am not able to have the wattmeter on the K3 >>match the output reading on the Bird wattmeter. Any suggestions? >> >> >> >> >> 73 >> de >> todd >> WB2ZAB >> >> _______________________________________________ >> Elecraft mailing list >> Post to: [hidden email] >> You must be a subscriber to post to the list. >> Subscriber Info (Addr. Change, sub, unsub etc.): >> http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/subscribers.htm >> Elecraft web page: http://www.elecraft.com >> >> >> -- >> No virus found in this incoming message. >> Checked by AVG. Version: 7.5.519 / Virus Database: 269.21.7/1329 - >> Release Date: 3/14/2008 12:33 PM >> >> > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by P.B. Christensen
Hi
Same here. I also ran out of range with a setting of 30. I usually use a OHR WM2 and the OHR 100 watt dummy load modified with a 20 db pad output. However the K3 seems to work fine and the internal wattmeter is accurate at 100 watts Don Brown KD5NDB > From: [hidden email]> To: [hidden email]> Subject: Re: [Elecraft] wattmeter calibration> Date: Sun, 16 Mar 2008 10:34:30 -0400> CC: > > Todd brings up a good point. I ran out of range while calibrating at the 5W > and 50W level.. I got pretty close but ran out of adjustable range.> > Also, I am confused as to what is happening with the RF Gain Calibration > procedure. The routine calls for setting power level at a pre-set level > and running through the bands. But how is the value adjusted and saved ? > And if TUNE is depressed later, are the saved values affected? Or, is it > the fact that the RF Gain procedure is conducted while in CONFIG that the > those settings are saved? It's just a very strange procedure and I don't > understand how a relationship is established between the displayed power and > RF Gain setting during setup. Can anyone explain? Tnx!> > Paul, W9AC> > > ----- Original Message ----- > From: "Todd Ruby" <[hidden email]>> To: <[hidden email]>> Sent: Sunday, March 16, 2008 10:09 AM> Subject: [Elecraft] wattmeter calibration> > > >I finished assembly except for PA last week and went through the > >calibration sequences. I am not able to have the wattmeter on the K3 match > >the output reading on the Bird wattmeter. Any suggestions?> >> >> >> >> > 73> > de> > todd> > WB2ZAB_______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by P.B. Christensen
I just received my elecraft equipment covers from Rose Kopp. The
craftsmanship is very nice, I highly recommend her. Jim K4JAF _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Todd Ruby
This has been added to the list with high priority. The range available
will be increased for both WTMTR HP and LP. 73 Greg AB7R -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of Todd Ruby Sent: Sunday, March 16, 2008 7:10 AM To: [hidden email] Subject: [Elecraft] wattmeter calibration I finished assembly except for PA last week and went through the calibration sequences. I am not able to have the wattmeter on the K3 match the output reading on the Bird wattmeter. Any suggestions? 73 de todd WB2ZAB _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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For the record - I can't get it to work either. If I calibrate the wattmeter to 5 Watts on 20m it is quite a long way out on several other bands - ranging from about 3W to about 7W. I am comparing it with an HP8484A so that might be an issue as it is a microwave head, but I think it goes down to below 10MHz.
I also completely failed to calibrate the transverter output. This outputs 3mW but the power meter can not see it at all. More worryingly, it always outputs 3mW regardless of the power setting. If I set the ALC off, then I can adjust it via the gain setting . It appears there is something amiss with power measurement. |
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Mike,
Did you follow the steps on page 46? You have to set the KXV3 menu to TEST and connect an RF Volt meter to the TX OUT BNC on the KXV3. Set power to 1 milliwat (0 dbm) and adjust WMTR for .224 Vrms on the external meter. Greg -----Original Message----- From: [hidden email] [mailto:[hidden email]]On Behalf Of AD6XY - Mike Sent: Sunday, March 16, 2008 10:22 AM To: [hidden email] Subject: RE: [Elecraft] wattmeter calibration For the record - I can't get it to work either. If I calibrate the wattmeter to 5 Watts on 20m it is quite a long way out on several other bands - ranging from about 3W to about 7W. I am comparing it with an HP8484A so that might be an issue as it is a microwave head, but I think it goes down to below 10MHz. I also completely failed to calibrate the transverter output. This outputs 3mW but the power meter can not see it at all. More worryingly, it always outputs 3mW regardless of the power setting. If I set the ALC off, then I can adjust it via the gain setting . It appears there is something amiss with power measurement. -- View this message in context: http://www.nabble.com/wattmeter-calibration-tp16079415p16081501.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com No virus found in this incoming message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.21.7/1331 - Release Date: 3/16/2008 10:34 AM No virus found in this outgoing message. Checked by AVG. Version: 7.5.519 / Virus Database: 269.21.7/1331 - Release Date: 3/16/2008 10:34 AM _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by AD6XY
I have now fixed my problem. RFC1 was not soldered in properly. At first, after much debugging of the schematic I thought it open circuit. It was only when I came to remove it that it became clear what had happened. One end was not soldered at all. A common problem with these large SMT inductors.
Here are my power readings for 5W calibrated at 14.15MHz made with an HP435B and a 8484A head. Please note this head is only specified down to 10MHz - though it does work below there. 80m 4.7W 60m 5.0W 40m 5.5W 30m 5.9W 20m 5.0W 17m 5.0W 15m 5.5W 12m 5.5W 10m 5.4W 6m 5.5W All to closest 0.1W. The maximum error appears to be on 30m at nearly 20%. This is pretty good, but you can not rely on the set power to be exact. For the 1mW setting from the KXV3, I only checked in a few places as I really only care what it is on 10m. I was able to set it to 1mW. At that setting the 1.5mW meter gave 1.5mW out. Pretty good. The accuracy degraded below 1mW, so 0.5mW power indicated was actually 0.6mW with things getting worse at lower levels. The minimum power output was around 0.2mW. I would like to look at the IMDs at the 1mW output, but I don't have the equipment for that at home. Mike |
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