SECC
[Top] [All Lists]

[SECC] Fw: [1000mp] MP Noise Blanker Issues

Subject: [SECC] Fw: [1000mp] MP Noise Blanker Issues
From: k4ab@email.msn.com (Larry Crim)
Date: Mon, 1 Jan 2001 19:30:09 -0600
Tom,

Are you familiar with this problem in the FT-1000MP?  If so, do you know the
mod?

I know several club members who like to know.

TU & HNY,

Larry K4AB

-----Original Message-----
From: Tim Duffy <tduffy@sygnet.com>
To: 1000mp@qth.net <1000mp@qth.net>
Date: Saturday, December 30, 2000 16:25
Subject: [1000mp] MP Noise Blanker Issues


>The problem with the NB front panel control is well documented by INRAD
>in their "MP Filter Selection and Operating Thoughts" It is a  4 page
>document. The document comes when you purchase INRAD filters.
>
>The IMD is deteriorated when the NB1 and NB2 switches are in the OFF
>position and the NB pot is in anything but the full CCW position.
>
>I have received many emails telling me that operators do not see any
>difference when he front panel control is varied with the NB's in the
>OFF position. Not every receiver will be affected the same. Signal
>strength and the number off signals on a band have a direct impact on
>this problem. The only time I can hear the problem is when the bands are
>full of contest signals...It is then very noticeable,
>
>According to INRAD's excellent info, the third order intercept goes from
>+14.5 dBm at full CCW to -7.0 dBm at full CW. This test was made on 7
>MHz, tuned front end, 500/400 Hz CW filters. The difference is amazing
>(21 dB!).
>
>The mod I mentioned before takes the NB circuit out of line when the
>NB's are off and then the control has no affect on the receiver
>performance.
>
>
>73,
>Tim K3LR
>
>
>---
>Submissions 1000mp@qth.net
>
>    *****ATTENTION*****
>This list is presently configured so that when you
>use your *Reply* function on your email application
>your message will be sent to the 1000mp list.
>If you wish to reply privately to the original poster
>cut & paste or type the original poster's address in
>the *Send* field of your email application.




--
SECC on the Web:          http://secc.contesting.com/
Submissions:              secc@contesting.com
Administrative requests:  secc-REQUEST@contesting.com
Problems:                 owner-secc@contesting.com


<Prev in Thread] Current Thread [Next in Thread>
  • [SECC] Fw: [1000mp] MP Noise Blanker Issues, Larry Crim <=