[amsat-bb] HC8LUT

[Matthew Stevens]

Thanks for the recording Dave! That was a very enlightening listening experience. As I suspected, in the SDR I am able to observe who was transmitting at the point where the “FMing” was worst (which you can hear about 2/3 of the way through my recording at https://drive.google.com/open?id=10ByP9n0P9FJnCsIsHl7HYWKcznxeluT8)

That was when AB1OC was CQing, and KC7KIU was attempting to call him. NS3L and myself were transmitting elsewhere in the band, and you can see/hear both of our signals dropping out when the QRO stations were calling.

As I noted on air in my recording, you can hear how easily I was making it into the satellite with 5w and a 7 element handheld antenna! I was also hearing quite well even with some local RFI. It’s not necessary to run the power levels that these QRO guys were using! My own QSO with NS3L was made very difficult due to the person tuning up on the frequency where AB1OC’s signal appeared soon after.

It would be great if everyone could use this as a learning experience: A) you don’t need high power on any of the LEO sats, really. And B) if you’re not hearing anything from the satellite, the solution is not to turn up your power! These QRO stations were obviously not hearing themselves or other loud stations, even though their signals were much much stronger than my own (which I was able to hear easily).

Just something to think about!

73,
- Matthew nj4y

Sent from my iPhone

> On Dec 7, 2017, at 17:32, David Swanson <dave at druidnetworks.com> wrote:
> 
> Actually Matt - it was a combination of AB1OC, AF5CC, and KC7KIU all using excess amounts of power, and none of them hearing each other. Here's a great RF recording I took on my SDR today of the pass in question. Feel free to download it here: 
> 
> https://drive.google.com/open?id=1qzbs6dLfO3UCdg8V7aQUoh8dBgmamXzu 
> 
> I recommend HDSDR for playback, but any SDR software should suffice. The fun stuff (and by 'fun' I mean transponder destroying dQRM) begins at 21:10:38z. 
> 
> Looking thru my logs it appears I've given at least 2 of culprits a fair amount of rover grids. If you can figure out how use your power knobs, I might give you more in the future. If not, then don't bother calling me on the road again. 
> 
> -Dave, KG5CCI
> 
>> On Thu, Dec 7, 2017 at 3:33 PM, Matthew Stevens <matthew at mrstevens.net> wrote:
>> It was another station, I believe possibly AB1OC, higher in the passband
>> who was using too much power. The entire passband was made ridiculously
>> noisy by one or two users' excessive uplink power "FMing" everyone's
>> signals. I'll review a couple of recordings from myself and other ops to
>> see if I can determine who it was. Maybe a polite email will help them to
>> use better operating habits, and make sat passes more fun for everyone!
>> 
>> 73,
>> 
>> 
>> - Matthew
>> ​ NJ4Y​
>> 
>> 
>> On Thu, Dec 7, 2017 at 4:20 PM, John Geiger <af5cc2 at gmail.com> wrote:
>> 
>> > I worked them easily for a new country on satellites!  What was the noise
>> > on AO7 that was present for much of the pass?
>> >
>> > 73 John AF5CC
>> >
>> > On Thu, Dec 7, 2017 at 3:16 PM, alex weimer <ingejack at cox.net> wrote:
>> >
>> > > Station HC8LUT was on AO7 again at 2106 Z time with a strong signal...
>> > > JACK  KC7MG
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