[Flexradio] Intersting observation on 6 mtrs with F3K

F3K, SDR 1.18.5 I have an ARR pre-amp at the feed point of my 6 meter yagi. 50 foot LMR-400 cpax When I turn on the ARR, the noise floor jumps UP from -140 to -110, not what I expected. The PRE2 on the F3K takes the noise floor DOWN from -130 to -140, definitely what I expected.

Re: [Flexradio] Intersting observation on 6 mtrs with F3K

Mark, The 3K is pretty hot out of the box, should not need much if any extra Pre Amp and you may be at the point of diminishing returns and amplifying the noise more than the signals you really want. If you can lower the gain of your outboard mixer to a lower level, maybe lower the voltage

Re: [Flexradio] Intersting observation on 6 mtrs with F3K

Sent: Monday, April 05, 2010 8:45 PM To: Mark Lunday, WD4ELG Cc: 'Flexradio' Subject: Re: [Flexradio] Intersting observation on 6 mtrs with F3K Mark, The 3K is pretty hot out of the box, should not need much if any extra Pre Amp and you may be at the point of diminishing returns and amplifying

Re: [Flexradio] Intersting observation on 6 mtrs with F3K

Mark Lunday, WD4ELG wrote: F3K, SDR 1.18.5 When I turn on the ARR, the noise floor jumps UP from -140 to -110, not what I expected. Actually, that is what I would expect, although 30dB sounds a bit much. The F3K sees an increase in noise from turning on the pre-amp. Take a conventional

Re: [Flexradio] Intersting observation on 6 mtrs with F3K

Of Alfred Green Sent: Monday, April 05, 2010 10:22 PM To: Mark Lunday, WD4ELG Cc: 'Flexradio' Subject: Re: [Flexradio] Intersting observation on 6 mtrs with F3K Mark Lunday, WD4ELG wrote: F3K, SDR 1.18.5 When I turn on the ARR, the noise floor jumps UP from -140 to -110, not what I expected

Re: [Flexradio] Intersting observation on 6 mtrs with F3K

Thanks to all who provided assistance and guidance. I appreciate it very much Mark Lunday WD4ELG Greensboro, NC - FM06be wd4...@arrl.net http://wd4elg.net http://wd4elg.blogspot.com ___ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz