[1000mp] 70 MHz IF tap

[Adam Farson]

Hi Hal,

I do not own an FT-1000MP. My only piece of Yaesu equipment is a Quadra. 

>From the FT-1000MP block diagram: The 1st-IF bandwidth is determined by the
roofing filter (RF-Unit, XF1001/XF1002). This filter is 12.5 kHz wide, and
follows the first mixer. The IF signal at the input to XF1001 should have
the same bandwidth as the selected RF BPF (typically several MHz).

Depending on the source impedance of the 1st mixer, the signal amplitude
will change somewhat as the frequency moves across the passband of the
roofing filter. 

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 12:15
To: All about Yaesu 1000mp
Subject: RE: [1000mp] 70 MHz IF tap

Dear Adam,

The problem is that the 1st I-F is only 12.5Kc's wide.

A number of people have tried, I am told.

Did you find any difference?

Hal 



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.
Adam VA7OJ/AB4OJ
 

______________________________________________________________
1000mp mailing list
Home: http://mailman.qth.net/mailman/listinfo/1000mp
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:1000mp at mailman.qth.net


--
No virus found in this incoming message.
Checked by AVG Free Edition. 
Version: 7.5.503 / Virus Database: 269.16.4/1147 - Release Date: 23/11/2007
09:19


No virus found in this incoming message.
Checked by AVG Free Edition. 
Version: 7.5.503 / Virus Database: 269.16.4/1147 - Release Date: 23/11/2007
09:19
 

No virus found in this outgoing message.
Checked by AVG Free Edition. 
Version: 7.5.503 / Virus Database: 269.16.4/1147 - Release Date: 23/11/2007
09:19