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Now I use my MKU 23 LNC down converter
- mkulnc23_01.jpg (168.45 KiB) Viewed 14743 times
MKU LNC 23
Frequency range 2320 ... 2450 MHz
IF frequency 1404 ... 1534 MHz
Gain typ. 40 dB
Noise figure typ. 0.7 dB
Local oscillator (LO) 916.5 MHz SAW
Frequency stability (0 ... 40 °C) +/- 20 kHz
Supply voltage +9 ... 18 V DC
Receiver : TT S2-1600 using STV6110 satellite tuner IC, 65 dB gain (can be reduced by AGC voltage or by soft, as I do, and possibility to add 16 dB using BBgain)
Software: Tiny Spectrum Analyser v0.2 (can be downloaded here :http://www.vivadatv.org/viewtopic.php?f=60&t=271 )
first tests with dummy load
- MKU23-dummy load-Full scan-no attenuation-13Volt.jpg (167.23 KiB) Viewed 14743 times
observation is done using direct TT S2-1600 tuner frequency.
we can see the L.O. used at 965MHz and its harmonic at 1930MHz
we can see that the level is very lower than the chinese S-LNB . no saturation on the bandwidth we want to use
- MKU23-dummy load-1GHz scan-no attenuation-2460MHz-13Volt.jpg (162.56 KiB) Viewed 14743 times
observation is done using external frequency received by the down converter.
I will add some gain using TT S2-1600 BBgain :
- MKU23-dummy load-500MHz scan-BBgain 10dB-2422MHz-13Volt.jpg (163.08 KiB) Viewed 14743 times
- MKU23-dummy load-250MHz scan-BBgain 10dB-2422MHz-13Volt.jpg (167.2 KiB) Viewed 14743 times
- MKU23-dummy load-125MHz scan-BBgain 10dB-2422MHz-13Volt.jpg (167.75 KiB) Viewed 14743 times
now it's time to use an antenna and observe Wifi QRM
- MKU23-omni wifi antenna-62.5MHz scan-BBgain 8dB-2422MHz.jpg (168.58 KiB) Viewed 14743 times
cumulation of recording : after 5 mn :
- MKU23-omni wifi antenna-62.5MHz scan-BBgain 8dB-2422MHz-after 5 mn.jpg (179.91 KiB) Viewed 14743 times
Now I test my 1m 2.4 GHz 24dB gain Parabolic antenna.
2422 MHz
- MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2422MHz.jpg (174.22 KiB) Viewed 14743 times
- MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2422MHz.jpg (174.22 KiB) Viewed 14742 times
2437 MHz
- MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2437MHz.jpg (183.21 KiB) Viewed 14742 times
2395 MHz
- MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2395MHz.jpg (166.06 KiB) Viewed 14742 times
after 5 mn
- MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2395MHz after 5 mn.jpg (167.73 KiB) Viewed 14742 times
Conclusion:
This down converter seems easier to adapt to S2-1600 input than chinese LNB
2395 MHz is free of QRM
2437 MHz is too much Wifi-QRM for HAmTV
2422 MHz is to be tested with a DVB-S DATV modulator... will be done for next tests...
Jean Pierre F6DZP