[1000mp] Roofing filter observation, A=B test

[Tõnno Vähk]

I don't have the NB mods installed. I have actually not paid attention to the NB mod topic much and I searched the archives now to find that if NB gain is turned CCW there is no IMD problem if NB turned off. Is that general understanding buy now? 

73
es5tv

> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net 
> [mailto:1000mp-bounces at mailman.qth.net] On Behalf Of Jan Erik Holm
> Sent: 14. jaanuar 2005. a. 19:45
> To: All about Yaesu 1000mp
> Subject: Re: [1000mp] Roofing filter observation, A=B test
> 
> Was the NB fixed in both radios?
> 
> 73 SM2EKM
> -----------------------------------------
> 
> Tõnno Vähk wrote:
> > Just a quick note on my roofing filter observations:
> > 
> > I have two MPs both so far with IF mods. All filters in and 
> mostly identical in all measurements.
> > 
> > So I had the opprotunity to install roofing filter into one 
> instead of IF mod and do A=B testing.
> > 
> > 1. I did not notice signal strength change. I think I have 
> both set to 12 in 9.x menu and they were still identical. 
> > 2. I did not find any strong enough signals close enough to 
> cause any 3rd order IMD products so I did not see any 
> difference in signal clarity, cutting splatters or anyhing 
> like this. I guess I have to wait for contest for that.
> > 3. What I did notice for sure was remarkable HISS 
> REDUCTION. The backround noise was constantly about 1-2 
> S-units lower on all bands. Quite remarkable. The receiver is 
> more quiet. What actually seems like an ordinary band noise 
> was noticably lower. 
> > 
> > I am satisfied:)
> > 
> > 73
> > tonno
> > es5tv
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> > 
> 
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