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Preamplifier at the antenna ??

Author Post
Pop, YU7EF
Fri Dec 10 2010, 10:39PM
Pop, YU7EF
Registered Member #1409
Joined: Sat Oct 09 2010, 06:31PM

Posts: 3
Hi Chris

Rather late replay to your post but it's never too late ...

You may consider using AD6IW wide band LNA with pHEMT MMIC SPF5122Z covering 50MHz all the way to 2.3GHz
It has remarkable gain, extremely low noise figure and, very important, very high IP3 .... published in DUBUS this year

Measured IP 3, Gain and NF vs. Frequency

Frequency MHz IP 3 dBm Gain dB NF dB
50 30 25.4 0.6
70 30 25.5 0.5
144 31 25.3 0.37
222 32 24.6 0.36
432 33 22.6 0.39
1296 35 15.7 0.62
2304 37 10.3 0.8
Measured at 3V at 5V > for 1-2dB at 5V > .5-1dB at 5V > .1dB

As I heard, it can be purchased from author for only 25 US$ which is bargain ...

However, unless you want to go for EME and other weak signal modes LNA can be more trouble than benefit

Hope this helps

73, Pop, YU7EF


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