[1000mp] Band scope information follow-up

[Alex VonYonkers]

Tod,
	it seems quite a chore to ad the circuitry you describe into the radio. Would it not
be more simpler to design an external block (what ever it wold be) and attach it to the antenna input
of the radio. Biensure, you must provide a sequencer also to protect it but IMHO I would
do it this way.
Alex




On Sunday, April 13, 2014 6:54 PM, Tod Olson <tod at k0to.us> wrote:
 
I have followed up on Ron Long¹s very welcome URL suggestions.

At this time I am of the opinion that I will be using the Clifton
Laboratories Z10000B-U buffer amplifier installed as it is shown in the
very nice write up on how to do the tap avoiding the limiting effect of a
roofing filter and also avoiding de-tuning the very excellent dual
balanced mixers which are so good in the FT1000MP.The installation looks
to be a trifle tricky because there is no good way to mount the buffer amp
near the RF board. [At least that was the opinion of Jack, the owner of
Clifton Labs.] The Clifton Lab method will take the signal off at 70.45
Mhz at a point where the mixer transformers are link coupled from one
stage to the next. I suggest that interested parties check all three of
Ron¹s suggested URLs to get an idea of what our options might be.  I have
listed them at the end of this message. The order reflects my opinion of
the utility of the three URL¹s.

Remember, my plan is to use a USB TV dongle which has had special, free ,
software developed by hams to provide all of the tuning that usually is
done with SDR radio kits. The price of the dongle delivered is less than
$20 and it tunes from 25-1000 Mhz. The display is the computer monitor.
Early testing with a IC706MII shows that the bandscope display can run in
parallel with other programs running on the computer without problems. The
software allows one to select a frequency on the display or tune the radio
and have the center of the display follow the radio VFO. The dongle is,
however, an 8 bit device which probably limits the SNR to about 45 dB.
That is the same as is found in a lot of other radios with built-in band
scopes. For a substantial increase in cost you can get 12 bit dongles
which will have better resolution.

I want to publicly thank Ron again for sending along these URL¹s. They
saved me a lot of time and prevented me from needing to reinvent things
that had already been successfully created.

Once I have successfully done the installation and testing I will generate
a write-up that I can post on my website. I will try to get as many
pictures as possible since that often is the best way to make sense out of
the text.

Tod, K0TO

http://www.cliftonlaboratories.com/z10000-u_buffer_amp_and_ft-1000mp.htm
http://www.dh1tw.de/bandscope-modification-yaesu-ft1000m


http://www.pensioneitaliacapri.com/ham/pan.adapter/la-braciola.htm




>


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