[1000mp] Re: MP Clicks

[Tom Rauch]

> So maybe the clicks I hear from stations just outside the passband
> (250 hz) are generated in the xmtr? I had assumed they were the rcvr's
> inability to handle very strong sigs that close to the passband
> (Mk.V). I don't remember them being that noticeable with my old '

It could be a problem partially in the receiver, but certainly many 
rigs click. 

I'm not sure how the MKV is for close-spaced blocking and IM DR, 
but the MP and the 1000D suffer from overload of the noise blanker 
input transistor, and that can generate spurious signals. 

This problem occurs with the noise blanker OFF. The MP is 
improved by turning the NB gain control down, although that 
doesn't totally eliminate the problem.

In the FT1000(D), you have to clamp gate 2 of the noise blanker 
input transistor to ground to eliminate the overload, but it is a 
simple mod to make.


73, Tom W8JI
W8JI@contesting.com