: Donnerstag, 31. März 2011 00:03
An: Zachary Beougher; Amsat - BBs
Betreff: [amsat-bb] Re: Preamp Distance from Antenna
Hi Zack, KD8KSN
The loss in dB of the coax cable from the antenna to your preamplifier adds
directly to the Noise Figure NF of your preamplifier. As an example if the
loss
: Donnerstag, 31. März 2011 00:03
An: Zachary Beougher; Amsat - BBs
Betreff: [amsat-bb] Re: Preamp Distance from Antenna
Hi Zack, KD8KSN
The loss in dB of the coax cable from the antenna to your preamplifier adds
directly to the Noise Figure NF of your preamplifier. As an example if the
loss
Why do you need a preamp in the mobile? Most new rigs are great at
sensitivity. You must also remember that if you are mobile, Intermod is
just around the corner at these high sensitivity preamps.
Preamps, as a rule, should be as close to the antenna as mechanically
possible.
Good Luck,
73,
Hi Dee,
I have tried monitoring passes with the FTM-350AR, and it is just about
impossible to hear anything. Granted, I was using a 5/8 wave, but I have
used a 1/4 wave several times before with a different radio and experienced
similar results. I will probably try it again just to make
... mobile installation ... preamp ...
You will have better results by parking the car and attaching your Arrow
Antenna to your mobile rig ... AFTER turning TX power down to 5W.
Just an idea ...
Clint, K6LCS
--
Clint Bradford, K6LCS
Hi Zack, KD8KSN
The loss in dB of the coax cable from the antenna to your preamplifier adds
directly to the Noise Figure NF of your preamplifier. As an example if the
loss of the coax cable is say 0.7 dB and the Noise Figure of the
preamplifier is 0.55 dB as specified by the manufacturer then the
