[Elecraft] Re: Using Spectrogram 7.1

[Mike McCoy]

There are no radical changes in Spectrogram 7.1 that would prevent someone
familiar with previous versions from using it.

The only difference was that for some reason 7.1 now inverts the 'Y'
amplitude scale from previous versions. So instead of '0' amplitude being
labled say, -60dB (depending on the range you select) it now begins at 0dB
with the top of the scale reflecting the range (e.g. +60dB).

Hope that made sense but it's only a minor annoyance. Just pick a max
amplitude (say, 60dB) and adjust the AF/RF gain to some arbritary level
below that (i.e. +40dB). All measurements thereafter are relative to that
initial 'baseline'. The fundamental on screen plotting of the filter
characteristics will otherwise look identical to previous versions.

The (IMHO slight) advantage of 7.1 over previous versions is it allows
signal averaging over time. Setting the value high (e.g. in tens of seconds)
reduces any 'transient' errors and smooths the plot considerably resulting
in a more 'asthetically pleasing' view of the filter curve.

Mike - K5PU

----- Original Message -----
From: "Tom Hammond N�SS" <n0ss@earthlink.net>
To: <Unifiedtx@aol.com>; <elecraft@mailman.qth.net>
Sent: Thursday, November 07, 2002 9:52 AM
Subject: [Elecraft] Re: Using Spectrogram 7.1


> Roy, et al:
>
> >I have looked at the Builders Resources section of the website.
Presently
> >I see nothing currently on how to use the 7.1 Spectrogram version.  I
have
> >downloaded this new version to my hard drive.  When I try to backup this
> >program to a disc, I am told this program is too big to backup on a
> >regular 3.25 " disc.  I have the 6.1 version on a disc; but when I try to
> >download this to the hard drive (C), the 7.1 files take over.
> >
> >I want to be able to use the 6.1 version.  When aligning the KAF2 filters
> >for example, I do not see how it can be done with the 7.1 version.  Maybe
> >this is because I just don't know how to use 7.1.  Tom, N0SS, can you
help me?
> >
> >Roy Morris  W4WFB  K2/100 #2225
>
> 1) There's probably no overwhelming reason to use Spectrogram v7.0 for
> K2/K1 filter alignment... as ANY previous version should work every bit as
> well.
>
> 2) Just this morning, I posted several links to sites which still offer to
> LAST FREEWARE version (5.1.7) of Spectrogram, which will works GREAT.
>
> 3) It appears that, following a number of 'improvements' to Spectrogram
> v6.x, to get to v7.0, the author has decided to significantly increase the
> price to $45 (US).
>
> 4) Fortunately, the author still offers a 'demo' version which is fully
> operational, but is time-crippled, limiting each single use to 10 minutes.
> This is NOT a terribly onerous problem however, as once you get the 'feel'
> of what you're doing with Spectrogram (usually in the first 10 minutes),
> you can easily complete the remaining alignments in the next 10-minute
period.
>
> I've not (yet) downloaded v7.0, but will do so this morning and I'll try
to
> offer some hints on using this new version later today. Though I don't
> expect it to function significantly differently from v6.x. Please QRX.
>
> 73,
>
> Tom  N0SS
>
>
> _______________________________________________
> Elecraft mailing list: Elecraft@mailman.qth.net
> You must be a list member to post to the list.
> Postings must be plain text (no HTML or attachments).
> See: http://mailman.qth.net/mailman/listinfo/elecraft
> Elecraft Web Page: http://www.elecraft.com