Re: [amsat-bb] AIDC-2733 gain measurement

["greg" <greg@xxxxxxxxxxxx>]

how do you tune that filter ?

GREG N8TDL

> Art, 
> 
> In stock configuration, the AIDC 3733's frequency response is specified
> only down to 2500 MHz, so your results as stated are inconclusive.  Did
> you measure its conversion gain anywhere else?  Did you re-tune the two
> comb filters to 2400 MHz before you measured it, or are they still tuned
> for the stock bandwidth?
> 
> regards,
> 
> Mahlon - K4OQ
> 
> Art Goldman wrote:
> > 
> > All:
> > 
> > While we wait for our 144 Mhz crystals to arrive, I took my
> > 3733 and put it back on the Agilent signal generator and
> > spectrum analyzer. This time I had the N Adapter in place of
> > the dipole, so I could more accurately measure conversion
> > gain.
> > 
> > With 2401.323 Mhz, -80 dBm input I got 123.358 Mhz, -58.86
> > dBm output
> > 
> > So at our frequencies, I see a conversion gain of only 21.14
> > dB, which is considerably less than the 37 dB gain printed
> > on the side label.
> > 
> > Does this correlate with other measurements?
> > 
> > Reason for asking: while in beautiful downtown Atlanta the
> > signals were S9+ on Sunday, in rainy and depressed Maryland
> > (the Terps lost to Duke) we didn't hear a peep. So we're
> > trying to figure out where the problem lies. (And yes, we
> > remembered the time change; had the latest keps; and a
> > reasonably accurate antenna alignment). We tried both a DEM
> > converter and the AIDC, both on a parabolic grid antenna.
> > The AIDC had the integral dipole. I've yet to try the N
> > adapter hookup.
> > 
> > How much effect should we expect shooting through a maple
> > tree with no leaves on it? Enough to completely null the
> > signal?
> > 
> > Any other ideas?
> > 
> > Tks,
> > Art, N3OY
> > 
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