[1000mp] 70 MHz IF tap

[Tod -ID]

Hal:

Use a FET follower to capture the signal ahead of the 12.5 MHz [that is the
Yaesu standard as I recall ] roofing filter at the output of the up
converter mixer  . The FET follower circuit needs to be designed to
accommodate a high impedance input and have a low impedance [ nominally 50
ohms] output. Doing that should allow you to run a very small diameter coax
to your gold connector on the apron and use your nifty device. 

I expect someone on this list < maybe me if the price is right > would be
interested in buying your  SM-7071 unit if you decide the 70 MHz tap is not
something you want to fool with.

73, Tod, K0TO



> -----Original Message-----
> From: Adam Farson [mailto:farson at shaw.ca] 
> Sent: Monday, November 26, 2007 12:34 PM
> To: 'All about Yaesu 1000mp'
> Subject: RE: [1000mp] 70 MHz IF tap
> 
> Hi Harold,
> 
> It should be possible to tap off the 70 MHz first IF ahead of 
> the roofing filter. The sampling output should be buffered. 
> This will allow connection of your RF spectrum analyser.
> 
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>  
> 
> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net 
> [mailto:1000mp-bounces at mailman.qth.net]
> On Behalf Of Harold Mandel
> Sent: 26-Nov-07 10:48
> To: All about Yaesu 1000mp
> Subject: RE: [1000mp] 70 MHz IF tap
> 
> Hi, Todd,
> 
> I tried the same method, only to be unhappy.
> 
> Matter-of-fact, I bought the very last NIB SM-7071 for over a 
> thousand bucks, hoping to match it up to the FT-1000MP-Mk-V.
> 
> I ran the 70MHz. to a gold connector on the apron and plugged 
> the scope up, only to find out through extensive questioning 
> that the 70MHz output is only 12KHz wide!
> 
> So now I'm stuck with a thousand dollar scope that can switch from
> 10.7 to 70 MHz I-F's.  I'm thinking of opening up my old 
> Kenwood TS-450AT rig and yanking the I-F on that. The best 
> thing about that project is both the Kenwood and the SM-7071 
> are 12 volt DC, (the '7071 does 120 ac or 12 DC), so it could 
> be great for a battery type field day.
> 
> Hal
> W4HBM 
> 
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> 
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