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RE: [linrad] xpol question
- Subject: RE: [linrad] xpol question
- From: postmaster@xxxxxxxxxxxxxxxxxxx
- Date: Mon, 14 Jul 2003 13:34:18 GMT
I need definately low system NF , and with the stepattenuator I can go for the High
dynamic range if needed.
> > I am using direct conversion(2x SBL1 and signalgenerator) from 144 Mhz to
> > 2,5Mhz(rx2500).
> > Just finished a steep bandpass 142Mhz 148Mhz -50dB and putted it all
> > together.Still over 40dB gain in front of mixer. It looks to much for the
> > Delta 44, so I have to play around with the gain distribution in the Rx
> > chain
> In case you do not have an amplifier between SBL-1 and RX2500 I suggest
> you run the Delta 44 at max gain. Then the NF at the RX2500 input will
> be about 9dB so you will have NF=15dB at the mixer input. Suitable
> gain will be 25 to 35 dB depending on whether you want low system NF
> or high dynamic range.
> Leif / SM5BSZ