[Elecraft] OT: Difference between PN2222 and PN2222A?
What's the difference between a PN and a PNA transistor? When used as a switch, can a PN be used as a substitute for the PNA? Thanks. -Ben K1NT ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
Re: [Elecraft] SMT project
I have done both the N0SS Version of the K6XX CW tuning indicator as well as the KD1JV Digital Dial/Frequency Counter. Both are good starting projects for SMT as they don't have a large parts count. The N0SS instructions for the CW tuning indicator are great for a beginner at SMT. I used a hold-down device that used fishing weights to apply pressure to the SMT parts via a blunt toothpick. Worked great! Dont forget to use a very fine tip for your soldering station. -Ben KB1AHR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] K2 Filter Setup CW vs CW Reverse
I've been playing around with the filter setup in my K2 S/N 4429 to get them to my liking. Has anyone had any luck getting the difference in pitch between CW and CW reverse to a reasonable level. I'd really like it to be within 10Hz if possible. From my understanding the factor which determines this is the accuracy which the original signal has been tuned in. I am confident in my ability to zero beat a received signal against the spot tone, which should make the tones of the two within 5Hz of each other(based on the 10Hz resolution of the VFO). But even when a signal is zero beat it seems my tone pitch between CW and CW reverse in the filters is closer to 30Hz. I've noticed that there is some discrepancy in the requested sidetone pitch in the menu setting and the actual spot tone frequency. I'm not sure if this has anything to do with it or not. I get an actual 600Hz tone when the sidetone is set for 590Hz. Measurements made with Spectrogram. Anyone have any insight, or is this small of a pitch difference between CW and CW reverse not possible due to DAC resolution maybe? -Ben KB1AHR K2 S/N 4429 ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] K2 #4429 on the air!
Well after about 5-6 months of building, K2 # 4429 was used for its first on the air contact today. I had also only had 5 cw contacts ever before this, all around 10 years ago, so it was pretty well new for me too. All went well. I didn't get perfect copy, but I was much more relaxed than I remember being all that time ago. Looking forward to many more to come! Thanks to the many on the reflector helping me with the build issues I had, and to elecraft for the great support, and product. Hope to meet some of you on the air. -Ben KB1AHR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] K2 4 MHz reference oscillator calibration
I need to calibrate the reference oscillator in my K2. Don't have any test equipment so I'll need to do it against WWV at 10 MHZ using the N6KR method. I'm a little confused as to how to zero beat the WWV carrier as it instructs me to. The instructions say to zero beat the carrier precisely, or adjust the VFO for best quality on a voice signal. So, assuming these are both happening at the same time (if they're going to produce the same result) if I have the voice tuned correctly (using USB or LSB mode), I can't hear the carrier, so how can I zero beat it? What am I trying to zero beat the carrier against anyway? Also isn't the voice reception dependent on the BFO setting of the filter? My filter settings are not yet optimized, I was planning on doing that after doing the reference oscillator. I'm confused about all these points. I've also read AB9GV's notes on W3FPR's web page, and I think they just confused me even more. Can anyone shed some light on this for me to make it a little more clear? Thanks. -Ben KB1AHR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] K2 10m Power Output
Hello all, I completed the transmitter alignment on K2 #4429 recently. In checking the power output on all the bands I found that I can indeed get just over 10w on 10m at 28.2 MHz (the frequency used to peak the bandpass filters) as long as I am using a power supply. Using a battery, I had too much voltage drop, and less power output. When I tune up to 28.8 MHz, I can only get less than 9w output (using the power supply.) Why does the manual instruct to use 28.2 MHz to peak the filters rather than 28.4 MHz which would be the center of the K2 band specification for 10m? I would think using 28.4 MHz would give me higher output at the high end of the band probably at the expense of lower power at the lower end of the band. Since the bandpass filter is shared between 10m and 12m, I don't know if doing the peak at 28.4 MHz would adversely affect 12m or not. Any thoughts? I'd like to get 10w minumum over the whole band if I can. Should I try and get the power to be more even across t he band, or am I being too picky here? By the way, I was very careful with T2 during construction. Red winding occupies about 85% of core, and green winding about 50%. It is spaced between 3/32 and 1/8 off the PC board. I did not however interleave the windings on T4, I wound it as instructed in the manual. -Ben KB1AHR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
Re: [Elecraft] Auto Tuner Wish List
John W2XS, I have been wondering about a balanced L network auto tuner for some time now. No one is making one that I know of at this time. Like you, I thought it would be great for the Elecraft guys to produce a kit for it. And Don K7FJ, I would be very interested in following your progress in building one of these as you described in your post. Here's my wish list. 1) Balanced output using a balanced L network with 2 set s of inductors and one set of capacitors. 2) Current balun at input. 3) Programmable and switchable to be able to use unbalanced line as well by: switching the balun out of line, and bypassing one set of inductors to effectively be the same tuning circuit as the presently available L network autotuner. 4) At least 2 antenna inputs (even better 3) each separately programmable and switchable for balanced or unbalanced as stated above. 5) 160m - 10m capability. 6) Bypass function. 7) 150w power handling minimum. 8) Maybe an option kit to add an analog meter if the user wants one. 9) Same algorithm as KAT100, where it searches for the best match, not just an acceptable one. 10) Function to auto-retune when a certain (user selectable maybe) SWR threshold is exceeded. 11) Integration with the K2 TUNE and ANT 1/2 functions as the KAT100 does 12) Selectable Ability to use stand-alone with other non-Elecraft rigs 13) A kit So Wayne, Eric, what do you think? Another idea might be to sell production rights to manufacture an assembled version. I bet lots of people who maybe don't like kits would be interested in an assembled one. This thing has the potential to be marketable to a very much larger customer base than elecraft's current product offerings. Of course I'd buy the kit, and use it faithfully with my K2 (s/n 4429) which is very close to completion by the way. -Ben KB1AHR ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
