[1000mp] Band scope information follow-up

[Tod]

Alex,

I certainly agree that sampling from ahead of the radio might be simpler to effect. As you point out, you would need to be certain that when you transmitted the sampling path was sufficiently protected.

One other consideration is that the low cost, USB TV receiver (dongle) has a lower frequency range of 25 MHz. To cover the amateur bands would require some sort of frequency converter. 

Tod, K0TO

Sent from my iPad air


> On Apr 14, 2014, at 1:50 AM, Alex VonYonkers <n2nnu at yahoo.com> wrote:
> 
> 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