using TSA for KUHNE MKU23 down converter observation

Messagede F6DZP » Jeu 9 Jan 2014 07:59

Hello,

Now I use my MKU 23 LNC down converter

mkulnc23_01.jpg
mkulnc23_01.jpg (168.45 Kio) Vu 4691 fois

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
MKU23-dummy load-Full scan-no attenuation-13Volt.jpg (167.23 Kio) Vu 4691 fois

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
MKU23-dummy load-1GHz scan-no attenuation-2460MHz-13Volt.jpg (162.56 Kio) Vu 4691 fois

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
MKU23-dummy load-500MHz scan-BBgain 10dB-2422MHz-13Volt.jpg (163.08 Kio) Vu 4691 fois


MKU23-dummy load-250MHz scan-BBgain 10dB-2422MHz-13Volt.jpg
MKU23-dummy load-250MHz scan-BBgain 10dB-2422MHz-13Volt.jpg (167.2 Kio) Vu 4691 fois


MKU23-dummy load-125MHz scan-BBgain 10dB-2422MHz-13Volt.jpg
MKU23-dummy load-125MHz scan-BBgain 10dB-2422MHz-13Volt.jpg (167.75 Kio) Vu 4691 fois


now it's time to use an antenna and observe Wifi QRM

MKU23-omni wifi antenna-62.5MHz scan-BBgain 8dB-2422MHz.jpg
MKU23-omni wifi antenna-62.5MHz scan-BBgain 8dB-2422MHz.jpg (168.58 Kio) Vu 4691 fois


cumulation of recording : after 5 mn :
MKU23-omni wifi antenna-62.5MHz scan-BBgain 8dB-2422MHz-after 5 mn.jpg
MKU23-omni wifi antenna-62.5MHz scan-BBgain 8dB-2422MHz-after 5 mn.jpg (179.91 Kio) Vu 4691 fois


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
MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2422MHz.jpg (174.22 Kio) Vu 4691 fois


MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2422MHz.jpg
MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2422MHz.jpg (174.22 Kio) Vu 4690 fois


2437 MHz
MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2437MHz.jpg
MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2437MHz.jpg (183.21 Kio) Vu 4690 fois


2395 MHz
MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2395MHz.jpg
MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2395MHz.jpg (166.06 Kio) Vu 4690 fois

after 5 mn
MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2395MHz after 5 mn.jpg
MKU23- 2.4GHz dish 24dB gain-62.5MHz scan-BBgain 8dB-2395MHz after 5 mn.jpg (167.73 Kio) Vu 4690 fois


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
F6DZP
 
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