RE: [linrad] OH0 June 12: Rx/Tx measurements

[Giancarlo Moda <i7swx@xxxxxxxxx>]

Hi Leif,

I understand your point, thanks.

I like Peter Hart, G3SJX, reviews, published in RadCom
(RSGB) versus ARRL. Peter knows how to make tests and
he learnet how not to "irritate" manufacturers with
his comments. He may do IMD tests at 20 or 50 kHz on
all bands but then he can go into a specific band,
like 7 MHz and start from 200 100 Khz to 3kHz spacing.
While there are not too many differences withing this
range, you can see numbers dropping rapidly, from 20,
15, 10, 7, 5, 3 kHz. Here there are differences
between models of same manufacturer and between
manufacturers ... there must be something wrong...

73

Gian
I7SWX

--- Leif_Asbrink <leif.asbrink@xxxxxxxxxxxxxxxx>
wrote:
> Hello Gian,
> 
> > it would be nice to see, on commercial and
> homebrew
> > equipment, IP3 figures also at 10KHz and 5kHz
> spacing,
> > to have a better idea on how these perform after
> the
> > front end.
> I think we can trust the ARRL data for IM3 at 5 kHz 
> spacing. 
> 
> I have never had any problems with close range 
> intermodulation in real life and my feeling is that
> it is more of academic interest and therefore not
> first priority when doing measurements at a ham
> meeting.
> 
> 73
> 
> Leif  / SM5BSZ
> 
> 
> 
> 
> > 
> > 73
> > 
> > Gian
> > I7SWX
> > 
> > --- Leif_Esbrink <leif.asbrink@xxxxxxxxxxxxxxxx>
> > wrote:
> > > Hi All,
> > > 
> > > Like for last years VHF meeting I will bring
> > > equipment
> > > this year to measure dynamic range properties of
> > > amateur
> > > transceivers.
> > > 
> > > Those of you who go there and have a modern rig
> (one
> > > that
> > > is still available on the market) please bring
> it if
> > > you
> > > can. I am interested in collecting data from
> several
> > > different
> > > units of the same model for a Dubus article
> about
> > > typical 
> > > performance of modern amateur equipment.
> > > 
> > > The big problems are sideband noise in Tx and Rx
> as
> > > well as
> > > keying clicks and splatter in SSB mode. I am
> > > interested
> > > in collecting more data like what you can find
> here:
> > >
> >
>
http://antennspecialisten.se/~sm5bsz/dynrange/rig_compare.htm
> > > 
> > > 73
> > > 
> > > Leif  /  SM5BSZ
> > > 
> > > 
> > 
> > 
> > 
> > 	
> > 		
> > __________________________________
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> 



	
		
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