RE: [Elecraft] K2, Noise Gen and Spectrogram
James, A noise source (NG1 will do nicely) and Spectrogram are all that is required (ignoring the cable to connect the K2 to the sound card input). Take a look at the K2 Dial Calibration article on my webpage http:/w3fpr.qrpradio.com for the information you seek. If you want to bypass all the information contained there about setting the reference oscillator, just skip to Step 3, Cal FIL. There are links to additional information should you need it. There is also information on the Elecraft website - look in the Builder's Resources pages. 73, Don W3FPR -Original Message- I need to set my K2 Filters. After I had changed one of my chips a few years ago, I know by operating my K2 that the filters are 'off' and need to be reset. I had forgotten about it until this Field Day when my K2 was promptly removed from the table when the filter problem was 'found'. My friend previously set them originally using a noise generator and spectrogram. How is this done? Is spectrogram and a noise generator all I need? I just ordered the Elecraft NG1.. will this suffice along with Spectrogram? Does someone have a nice written web page or technical archive on using spectrogram with any kind of noise generator? Thanks! -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.323 / Virus Database: 267.8.2/29 - Release Date: 6/27/2005 ___ 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] K2, Noise Gen and Spectrogram
Hello James, The noise generator and spectrogram will do the job! Look at the www.n0ss.net webpage and you will find the article and downloadable software including instructions! With me, it worked. Good luck, Evert, PA2KW, K2 #4836 James Kern wrote: I need to set my K2 Filters. After I had changed one of my chips a few years ago, I know by operating my K2 that the filters are 'off' and need to be reset. I had forgotten about it until this Field Day when my K2 was promptly removed from the table when the filter problem was 'found'. My friend previously set them originally using a noise generator and spectrogram. How is this done? Is spectrogram and a noise generator all I need? I just ordered the Elecraft NG1.. will this suffice along with Spectrogram? Does someone have a nice written web page or technical archive on using spectrogram with any kind of noise generator? Thanks! James, KB2FCV ___ 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 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] K2, Noise Gen and Spectrogram
Your URL seems not to work. I located your page at http://www.qsl.net/w3fpr/index.htm. Should the other work as well? On Mon, 27 Jun 2005 16:00:30 -0400, W3FPR - Don Wilhelm [EMAIL PROTECTED] wrote: Take a look at the K2 Dial Calibration article on my webpage http:/w3fpr.qrpradio.com for the information you seek. ___ 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] K2, Noise Gen and Spectrogram
James, Sometimes in addition to a noise generator and a PC with a soundcard running Spectrogram you may need to add a 600 ohm 1:1 isolation transformer between the LS output of the K2 and the PC sound card input. Perhaps I was unfortunate in that both my PC and a separate laptop had spikes on the display from harmonics of the AC power frequency. In the UK we use 50Hz AC power so that was present as a very large spike followed by 150Hz and every 100Hz after that through the audio spectrum. With your use of 60Hz AC power in the USA would possibly expect that plus multiples through the audio test range if afflicted. The use of an audio isolation transformer killed these spikes stone dead. Don, W3FPR suggested the audio transformers from scrap PC modem cards as a possible source of suitable 600 ohm transformers. The Spectrogram program turned out to have other uses for me beyond checking K2s. Having done a hurried rebuild on a 2m repeater for a semi local repeater group, when installed on site the through audio was poor and sounded muffled. With the aid of a VHF noise generator plus my laptop running Spectrogram was able to follow the audio through from the repeater RX audio output, through the logic and right up to the TX modulator. Apart from the normal RX de-emphasis and the blocking of the audio below 300Hz in the logic to remove the incoming CTCSS, the audio was correct right the way through the system. The problem in the end turned out to be the TX modulation pre-emphasis was not functioning. No doubt there are many other uses for the Spectrogram program, but on this occasion saved me a lot of time in fault finding on the repeater. Bob, G3VVT ___ 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
