Michael wrote:
Have others noticed less RX sensitivity on the KX1 on 20M as compared to 40M and 30M?Yes, I have noticed that too. Went back & did the whole aliment thing, but no change. Receives good, just have to crank up the volume more.Reed W4JZ _______________________________________________ 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 |
Yes. I also get less change (as compared to 30m and 40m) when changing RF gain. I have also noticed (as predicted by Elecraft) that the KX1 is sensitive to your choice of headphones.
-----Original Message----- From: Michael Babineau [mailto:[hidden email]] Sent: Thursday, August 19, 2004 8:51 AM To: [hidden email] Subject: [Elecraft] KX1 RX Sensitivity on 20M vs 30M, 40M Have others noticed less RX sensitivity on the KX1 on 20M as compared to 40M and 30M? I recall that this was noted in the QRP Quarterly review of the KX1 a little while back and I have also noticed this on my own rig, so I am guessing that this is normal. Sensitivity is still sufficient on 20M but requires cranking the AF Gain a little higher on 20M than the other bands to get a similar signal volume. Michael VE3WMB P.S. This came to my attention again last night as I had to realign the Rig after finally getting around to installing the 30M module. BTW For such a little board the KXB30 was a real pain in the you-know-where to install! P.P.S I also put the Elecraft supplied sticker over the opening on the KXPD1 and it now looks much better ! _______________________________________________ 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 |
In reply to this post by Reed-11
I have also noticed somewhat reduced sensitivity on 20M, but sort of
expected that. Into a 50 ohm dummy load, and into 1.0-1.1 SWR antennas, I get about 3.3-3.5 watts out on 40M, 4 watts on 30M, and 3.0 watts on 20M. Have re-aligned...get the same. Is this typical? I didn't experience any frustration with 30M module. It all seemed to go together just fine for me. I've had dozens of QSOs with my KX1, and only have one unusual behavior (of the KX1...we won't go into mine) to report. Sometimes I get noise that is there when the LEDs are on, and goes away when the LEDs time out. Has anyone else experienced that? It does not happen all the time. Furthermore, it seems to be more likely to happen when I've been operating for a period of time, say at least 30-60 minutes. Anyway, I'm very pleased with the KX1. Just put together a little portable battery pack that uses two 4-AA cell packs and one 2-AA cell pack that I populate with NiMH batteries. It gives me about 12 volts for portable operation. Russ Eberhart, N9IV KX1 #742 _______________________________________________ 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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I think the manual says to squeze one of the output toroids until you
get less output on 20m than on 40m, as a sign that the filter is properly adjusted for harmonic reduction. When I was building my KX1, I brought it to a PAARA club meeting where Wayne was speaking, and he looked at my KX1 toroids which were evenly distributed, and said I needed to follow those instructions in the TX portion of the manual. On Sat, 21 Aug 2004 10:11am, Eberhart, Russell wrote: > Into a 50 ohm dummy load, and into 1.0-1.1 SWR antennas, I get about > 3.3-3.5 watts out on 40M, 4 watts on 30M, and 3.0 watts on 20M. Have > re-aligned...get the same. Is this typical? 73, WA5ZNU Leigh _______________________________________________ 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 |
In reply to this post by Reed-11
Eberhart, I get the same output as yours. I did the transmit toroid
thing several times & got no more than 3 watts out on 20, 3.3 to 3.5 on 40, & 4 watts on 30. This was done using a 13.6 volt supply. Using a 12 volt supply I get 3 watts out on 20 & 40 meters. I only notice the noise when the S meter is being used. 73s, Reed W4JZ _______________________________________________ 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 |
In reply to this post by Reed-11
Reed <[hidden email]> wrote :
>Eberhart, I get the same output as yours. I did the transmit toroid >thing several times & got no more than 3 watts out on 20, 3.3 to 3.5 on >40, & 4 watts on 30. This was done using a 13.6 volt supply. Using a >12 volt supply I get 3 watts out on 20 & 40 meters. >I only notice the noise when the S meter is being used. Ditto for me. I get about same output as Reed and I have noticed Buzzing (sounds like uProcessor whine) if I switch the display mode to S meter .. which I never use fortunately. Other than that the rig works fine for me. The reality is that on the receiving end the difference between 3W and 4W isn't noticeable so I guess we shouldn't be too concerned. BTW, I worked MM0MWW / P at the Hoxa Head Lighthouse in the Orkneys with the KX1 yesterday on 20M. I was operating portable using a vertical 24ft wire (suspended from a 24ft fishing pole) and 5 X 16ft radials on the ground. Michael VE3WMB _______________________________________________ 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 |
In reply to this post by Reed-11
i did a lot of measurements due to low sensitivity on 20meter with
trackinggenerator and spectrumanalyser the real max peak of the 20meter bandpass filter is at lower frequency (abt 13 MHz) if you align the filter for "max" gain on 14 Mhz the peak ist abt 6db lower as on 13MHz i did some changes at filter caps.... but there is a strong influence with the other two filters (40, 30 meter) maybee elecraft has there a new redesign with new filter values - just see with analyser the filter curves.. 73 OE6KYG _______________________________________________ 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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