[Moon-Net] IQ+ MAP 65 TEST & CONCLUSION
Edward R Cole
kl7uw at acsalaska.net
Sun Nov 6 17:53:13 CET 2016
OK, then try one of the preamps you are saving for help to
others. But put the second preamp after the 3-dB splitter as its
easy to overdrive with 22-dB gain from preamp No.1. You might
consider a PHA103+ preamp with 12 dB gain (WA3IAC offers them on
e-bay). I built five for him a year ago and they work fine as a
general purpose preamp or buffer amp. You could even insert a BP
filter ahead of the PHA103+ as you have sufficient gain from preamp No.1
Just ideas but try something and compare with eme signals.
I used an old 12-dB 1296 DEMI preamp after my G4DDK preamp for extra
gain (line loss is 7-dB). I will not use it with my new G4DDK since
it has 35 dB gain which quite sufficient even losing 7-dB in the cable.
GL and keep us advised on what you find out.
73, Ed - KL7UW
At 06:39 AM 11/6/2016, serge wrote:
>I know by now most of you are bored to tears with this THREAD. So
>this is for the folks who have the same problem as i do but were
>afraid to asked.
>With the help of some of the most famous EME GURUS i
>proceeded doing the following test that THEY suggested.
>1) 50 ohms dummy load on the IQ+ INPUT FLOOR NOISE 5DB ON MAP65
>2) ANTENNA CONNECTED (IQ+ TO SPLITTER LNA ON) 22DB WITH
>ELEVATION OF 15 DEGREES IN THE CLEAR OVER THE OCEAN
>3) ANTENNA CONNECTED (IQ+ to SPLITTER LNA OFF) FLOOR NOISE 5DB ON MAP65
>CONCLUSIONS: THE 16DB required are barley enough 22db -5db floor
>noise =16db RF GAIN & very often depending on the AZ/EL it can go
>down to -19db -5db = 14db RF GAIN well below of what is required. So
>I will have to work on increasing the RF GAIN to the IQ+. I guess if
>i took out the splitter i would probably gain 2 or 3db but i do not
>want to do that.
>I want to thank Leif SM5BSZ, Conrad PA5Y, ED KL7EW for their help:)
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73, Ed - KL7UW
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