Yes Thomas, but the 4W version needs one!
Posts by DL1GNM
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During QSO's I observe my signal on the Goonhilly WebSDR. If I send a long duration CW-signal it drops down after a short while. I think because of overheating. After a break the signal is OK again. In SSB I have no problems with this booster. But I think for digital modes this booster is not suitable with small dishes.
73
Thomas, I observed the same with the "4Watt" version I borrowed. Even during SSB. After mounting it on a big heatsink I had no problems.
Since end of July I'm using the SG-Labs transverter, that is working very well.
Regards, Mike
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I'm using SDR console - signal history. I wait for the CW-carrier of the QO100 beacon (2x in the middle) then i change to my frequency and CW-key down (mine right on the picture). It's on the same level. May be 0.5dB above...
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For every lens you need to adjust the focal point, because the phase centers are not the same.
I agree - As I observed with my dish: Venton Rocket Lens LNB seen as in picture: MER 5.2dB D2 (not in focus !) Usually you get good results with this lens. But not at that position I've put in this VENTON LNB.
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...thrown away after removing the lens.
Did the same but with a MAXIMUM XO-R2 LNB. Bought is only for the lens (~6€).
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Sounded like an digital and unstable signal. Strong and wide band. S/N of the CW beacon was degraded by more than 10dB! I can confirm what G8AWB heard.
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Finally the transponder noise of the NB transponder:
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Today I and many others observed heavy QRM on the satellite not caused by a 2m transponder. Attached you'll find some screenshots from my receiver and Goonhilly.
Date: 2019-09-08
Time: 13:18 +- UTC
Root cause unknown. Sun? DATV? QO-100 problem on NB transponder? I don't know.
Goonhilly:
My receiver:
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Mike, if your 2.4m dish gives you an MES of 10dB I can be happy with 8.8dB@ my 1.2m dish. It's the same as the Goonhilly station uses for QO-100 monitoring.
Mike
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Interesting Mike. I'm using Leo's GPSDO because I'm on the NB transponder in SSB as well. The LNB was wobbling terribly.
After realigning my dish the MER is at the same level as it was at first install without having the LNB modified.
I'm using the recommended setting from Leo Bodnar for 27 MHz & 10 MHz. If you have better recomodations to set up my GPSDO please let me know.
BTW: is a MER of 10dB the maximum possible value? I think there is a limit.
73 Mike
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After realigning elevation, I got my lost signal back.
BTW Mike (G0MJW) what is you dish size and LNB type?
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Did this Sunday morning in a similar way: Laptop with ultravnc. Or remote desktop will do the same but with sound.
Hope that I found my lost 0.8dB...
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Here is a link with some information about those WIFI amps. It's in Russian. So google translate is probably necessary.
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My Windows 10 PCs got an update to 1903. After rebooting I started SDR-Console with no success.
Reason: The Update replaced the RTL drivers. Solution: running the ZADIG tool again.
I'm using an old Prolific 2303 USB to RS232 converter for my FT-100 CAT Interface.
You have to use an old driver version not the actual to get the converter running.
This was replaced as well.
(my driver package has this file name: PL2303_Prolific_GPS_1013_20090319.exe)
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Yes I know. But unfortunately not in receive only mode by using a RTL stick. When using a transceiver (FT-100 in my case) SDR console mutes audio to zero. But not to a certain volume. So I prefer my hardware solution. Like in AO10/13 times.
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I've something similar. But I put a poti in between so I can reduce the level during my transmit and rise it up when tunig in (I'm using an analog non transceive transmitter). The mute level can be set. The hardware solution was chosen because SDR Console actual is not able to mute audio if not using a limeSDR or so. (V 3.0.12). And I want to use an analog receiver in future anyway.
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OK Mike, I've tested the "good C/N MER values" in the morning. I'll try this again. What kind of dish do you use? I guess you're using a POTY feed. Would be interesting to know of which parts your receiving system consists.
Sometimes I think my C/N correlates somehow to the signal seen on BATC WB monitor...
Regards Mike
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Hello Nader,
I've found something about the EP-AB003 here:
http://www.ra3apw.ru/qo-100/qo-100-stc7031_appn2/
It's in Russian. So google translate is probably necessary. You can see in the table what the current should be when driven by 80-100mW input.
Good success, regards Mike
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Tom, EA6WQ wrote he observed the same... So I'll look for more comments.
But good to know that uplink is still the same.
Thank you Peter.
