++++++++++++++++++ Date: Thu, 07 Nov 2002 12:38:09 -0600 From: "George, W5YR" Organization: AT&T WorldNet Service To: Tom Hammond =?iso-8859-1?Q?N=D8SS?= Cc: Unifiedtx at aol.com, elecraft at mailman.qth.net Subject: Re: [Elecraft] Re: Using Spectrogram 7.1 Tom and others, The author of SpetroGram, Richard Horne, offers a discount upgrade fee to 7.x for previously registered users of 6.x of only $15. 73/72, George Amateur Radio W5YR - the Yellow Rose of Texas In the 57th year and it just keeps getting better! Fairview, TX 30 mi NE of Dallas in Collin county EM13qe K2 #489 Icom IC-765 #2349 Icom IC-756 PRO #2121 ++++++++++++++++++ Date: Thu, 07 Nov 2002 11:20:07 -0600 To: elecraft at mailman.qth.net From: Tom Hammond =?iso-8859-1?Q?N=D8SS?= Subject: [Elecraft] Re. Spectrogram 7.06 for Adjusting K2/K1 Filters Roy, W4WFB asked about setting differences between Spectrogram v6.x and Spectrogram v7.x. I've just downloaded and installed (into a SEPARATE subdirectory) Spectrogram v7.0.6 and find it to be virtually (in normal usage) to v6.x. Version 7.x is about 3X the size of v6.x, and, for most of us, will probably not provide a significant improvement in those features we will want to use most of the time. It will however, probably provide a 'cleaner' plot if you are attempting to 'characterize' the bandpass of your filters. Though this is not something most of us will require and is NOT required to permit you to correctly adjust your K2/K1 filter settings. The main differences, with regard to how most of US would use it, seem to be in the Scan Input (parameter settings) screen. Here are the setting I (personally) am using, of course your mileage will vary, and you are the final judge of how YOU wish to configure this program for your particular tastes. Sample Characteristics Sample Rate (Hz) 11kHz (others work well, too) Resolution 8 bit (16 bit's OK, too) Type Mono Display Characteristics Channels N/A Display Line Plot Type Signal Averaging msec 500 (others work well, too, the higher the value, the longer it'll take the plot to stabilize. Though, the higher the value, the 'smoother' the plot will be) Time Scale N/A Amplitude Scale 60dB Palette CB Scroll Mem N/A Frequency Analysis Freq Scale Linear FFT Size (Points) 2048 (1024 works fine here, too) Freq resolution (Hz) (Use lowest value available for FFT value you have selected) Low Band Limit (Hz) 0 High Band Limit (Hz) 3000 (use what floats your boat. Other values may work better for you) Pitch Detector OFF Cursor Freq Offset 0 Recording Enable OFF (If you ENABLE this function, note that a higher value for Sample Rate will REALLY increase the size of the 'Recorded' file) Trigger Level (dB) N/A ______________ For aligning the KAF2 filters, you should proceed to set up Spectrogram JUST as you would above (for aligning your xtal filters). Though there is no reason to connect the FCTR probe to TP2 in the K2. 1) Connect the audio line from the PHONES output of the K2 to the MIC input of your sound card 2) Start Spectrogram. Press [F3] to get to the Scan Input screen. Note that you will have to configure Spectrogram as per the settings shown above. Once the parameters have been set, press [Enter] to start displaying the input signal. NOTE that the parameters you set establish for Spectrogram WILL be SAVEd when you exit the program, so they will be automatically reloaded when you restart the program... no need to REprogram. 3) If you have not already done so, once Spectrogram is displaying the input signal, click on POINTERS and select the cursor type (WHITE or BLOCK cross, depending upon whether you have chosen a white or black display background). I personally prefer a black cross on a WHITE background. 4) Again, click on the POINTERS menu, click on FREQ MARK and enter the SIDETONE marker frequency in to MARKER 1. If are entering markers for SSB, enter values into both MARKER 1 and MARKER 2. 5) Ensure that the KAF2 is DISABLED. 6) Select the 40M meter band, DISconnect the antenna from the K2 and tune in the 7.000 MHz 'birdie'. 7) Press [SPOT] and ZERO BEAT the note from the birdie against your sidetone. NOTE: If the sidetone is significantly louder than the tone from the birdie, go to MENU | ST L and reduce the sidetone level for this adjustment. Best results will be obtained when both tones (sidetone & birdie) about equal in level. 8) ENABLE the KAF2 by Press-Holding AFIL, to enable AF1. 9) Adjust R1 on the KAF2 to center the displayed passband over the tone from the birdie. This should place the peak of the received signal directly on top of the marker. 10) Press-Hold AFIL, to enable AF2. 11) Adjust R2 on the KAF2 to center the displayed passband over the tone from the birdie. This should place the peak of the received signal directly on top of the marker. Repeat steps 8 thru 11 to confirm your adjustment. DONE! Hope this helps. 73, Tom Hammond N0SS +++++++++++++++ Date: Thu, 07 Nov 2002 12:40:54 -0600 From: "George, W5YR" Organization: AT&T WorldNet Service To: Mike McCoy Cc: Unifiedtx at aol.com, elecraft at mailman.qth.net, "Tom Hammond =?iso-8859-1?Q?N=D8SS?=" Subject: Re: [Elecraft] Re: Using Spectrogram 7.1 Peak Hold will also "smooth" spectra of noise response, etc. For some purposes, it probably produces a more accurate spectrum than simple averaging. 73/72, George ++++++++++++++++ Date: Thu, 07 Nov 2002 14:24:49 -0600 To: "George, W5YR" , elecraft at mailman.qth.net From: Tom Hammond =?iso-8859-1?Q?N=D8SS?= Subject: Re: [Elecraft] Re: Using Spectrogram 7.1 Thanks George... missed that one... BUT it appears it'd only be useful if you already HAD the tuning completed.. where you weren't LOOKING for the peak to move as you adjusted the BFO... not? Tom At 12:40 PM 11/7/02, you wrote: >Peak Hold will also "smooth" spectra of noise response, etc. For some >purposes, it probably produces a more accurate spectrum than simple >averaging. ++++++++++++++++++ Date: Thu, 07 Nov 2002 15:56:55 -0600 From: "George, W5YR" Organization: AT&T WorldNet Service To: Tom Hammond =?iso-8859-1?Q?N=D8SS?= Cc: elecraft at mailman.qth.net Subject: Re: [Elecraft] Re: Using Spectrogram 7.1 Oh, absolutely, Tom. It is of no use with changing spectra as in K2 adjustments. But to get a good smoothed estimate of the final product, I find that it beats simple averaging. 73/72, George ++++++++++++++++