[1000mp] Inrad 1.8 Filters and Signal to Noise Problems

[Mike Schatzberg]

Peter.....

Just an additional note.....I spoke with a Japanese friend in Japan on 10
meters last night.....they are seeing the same thing in the Mark V....they
have been warned that the Inrad mod. will void their warrantees.....This is
definitely a topic for discussion.....Many operators are apparently
dissatisfied world wide.....Apparently the Inrad mod does indeed help the
situation.....but, since it is not plug in, some warrantee risk is
involved.....

73,

Mike Schatzberg
WB2AJI
http://www.qsl.net/vu2wap/wb2aji/
----- Original Message -----
From: "Mike Schatzberg" <wiremann@earthlink.net>
To: "Peter King" <va6no@shaw.ca>
Cc: <1000mp@mailman.qth.net>
Sent: Wednesday, February 13, 2002 8:48 AM
Subject: [1000mp] Inrad 1.8 Filters and Signal to Noise Problems


> Hi Peter.....
>
> Yes, I have seen the same thing.....I am disappointed about the noise most
> of all.....
>
> I can tell you that I have placed my JPS NIR 10 in the audio output line,
> and listen to the Mark V on my Kenwood speaker......
>
> This is the only effective way to kill the noise and work the weaker
> signals.....at least with my Mark V, the Mark V DSP settings are no as
> effective in the IF, only the top button gives some improvement in
> background noise reduction, and leaves the signal readable.....I called
> Yaesu and discussed this with Andy Ormandi, their Mark V expert.....He
> suggested lowering the IF Gain a bit.....I did this with some slight
> improvement.....but, according to my signal generator on 10 meters, this
> resulted in a slight decrease in sensitivity, and still didn't kill all
the
> noise......
>
> I will however change the filters to the Inrad 1.8s......With the DSP in
the
> audio line, it should work pretty well.....But, I believe I still will
> eventually send the radio to Yaesu, and let them bench test and retune the
> unit.....I'm not going to do it myself......why should I after spending
all
> that money....
>
> I also notice that my RF output is not consistently 200 watts across all
the
> bands....it starts out that way, but decreases to 175 on 20, about 150 on
> 15, and maybe 125 or so on ten meters.....How about your unit, I checked
> mine with an Autek Research WM-1......
>
> I'll let you know how the Inrad change works.....I won't send the unit
back
> to Yaesu, until it is completely burned in, and has a few hundred hours on
> it......
>
> Best wishes & 73,
>
> Mike Schatzberg
> WB2AJI
> ----- Original Message -----
> From: "Peter King" <va6no@shaw.ca>
> To: <wiremann@earthlink.net>
> Sent: Tuesday, February 12, 2002 7:23 PM
> Subject: another new Mark V owner...
>
>
> > Hi, Mike. I read your comments re the 2K filters in the Mark V. I have
> > only had my Mk-V a couple of weeks, having changed from Kenwood TS850's.
> > I am pretty disappointed in the receiver. Was expecting the 2K filters
> > to improve signal readability, but, if anything, they make copy worse.
> > I have fiddled with shift, width, EDSP, and carrier point, all of
> > which can improve the copy a bit, but, man, what a let-down.
> >
> > At this point, I don't think it is this or that filter, I think it is
> > the
> > radio. I tuned in to a local AM radio station, using non-sync AM tuning,
> > and listened to the audio from the Mark V, side-by-side with a Kenwood.
> > What a whopping difference! The Yaesu audio is slightly distorted, in AM
> > and SSB, on all audio peaks, and a bit worse with AGC in slow position.
> > I wonder if you have noticed anything similar?
> >
> > Are you considering the INRAD IF mod? Or have you put it in? Wondering
> > if you noticed a difference in fidelity. ( I know, fidelity is not your
> > main aim, as you said. )
> >
> > 73 de Peter (ve6epk)
> >
>
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