[Lowfer] Early morning VLF

Thu Jan 11 13:22:35 EST 2018

Mike,

I hadn't know about sdr.hu, thanks!. On sdr.hu I repeated the waterfall-rate
vs. SNR tests that you described, and saw the same results (waterfall SNR
independent of waterfall rate). Sent an e-mail message to
support at kiwisdr.com asking about the update rate. Just in case, I bought a
KiwiSDR, arriving tomorrow, will check integration time this weekend and
post here. Thanks for posting your screen capture, nice signals.

73,

Jim AA5BW

-----Original Message-----
From: lowfer-bounces at mailman.qth.net [mailto:lowfer-bounces at mailman.qth.net]
On Behalf Of N8OOU
Sent: Thursday, January 11, 2018 9:33 AM
To: lowfer at mailman.qth.net
Subject: Re: [Lowfer] Early morning VLF

Jim,

The current Kiwi software version initiates the waterfall rate in "fast" 
mode. That may become a customization variable in a future release. When I
"listen" to the Kiwi on my local network I rarely slow it down. I don't
remember changing that setting for the screen shot, so I believe it would
have been in the "fast" setting.

This morning I "played" with the setting to see what effect it has. From
what I have read in the Kiwi forum, that parameter was added as an
enhancement request to reduce the data rate coming from the Kiwi server.

In addition to the F-M-S settings there is a 1Hz setting and an off setting.
At the 1 Hz setting I see a new line being added to the waterfall screen
every second. (timing by internal body clock) I did not notice any other
change to the way the screen looked. The signal line patterns continued the
same patterns, brightness/colors did not change, magnification/blottyness
didn't change. (if that's a word??) The only change was the interval between
lines being added to the waterfall.  At the slow setting, my old body clock
can't time the rate of line painting, but the timing varies with F-M-S.

I have not read the forum messages you found, I'll look today. I don't know
what fps would mean.

Maybe you have all ready done this, but if not go to web url sdr.hu, select
a Kiwi radio, and try the options. Maybe I am missing something in operating
the radio.

73   de   N8OOU - Mike Meek

On 01/10/2018 11:53 PM, hvanesce at comcast.net wrote:
> Mike,
> 
> I checked some of the KiwiSDR user forums and found waterfall settings 
> Slow = 7 fps and Fast = 23 fps. I'm guessing that fps means frames per 
> second (updates of the screen per second). Do you know if your 
> waterfall rate was set on Slow, Medium or Fast for your screenshot
yesterday morning?
> 
> I'm guessing "Slow", but even in that case the SNRs of your 6 
> displayed signals speak well of the KiwiSDR and the noise at your
location.
> 
> Do you happen to know if the waterfall rate setting was "Slow"?
> 
> Thanks,
> 
> Jim AA5BW
> 
> 
> -----Original Message-----
> From: lowfer-bounces at mailman.qth.net 
> [mailto:lowfer-bounces at mailman.qth.net]
> On Behalf Of N8OOU
> Sent: Wednesday, January 10, 2018 4:15 PM
> To: lowfer at mailman.qth.net
> Subject: Re: [Lowfer] Early morning VLF
> 
> Jim,
> 
> I'm sorry to say I don't know the answers to the spectrum question. 
> The spectrum display is created by the KiwiSDR radio, and it does not 
> display those specs like you see in Argo or Spectrum Lab.  I had no 
> luck from a search of the Kiwisdr User forum. I think it is a question 
> for the developer.
> 
> I will say the waterfall has a rate control (slow, medium, fast), but 
> I think that is simply the speed at which a new line is painted. I 
> don't believe any integration is occurring.
> 
> I have had the radio for a little over a month, so I am still learning 
> about it myself.
> 
> 73   de   N8OOU - Mike Meek
> 
> On 01/10/2018 02:03 PM, hvanesce at comcast.net wrote:
>> Hello Mike,
>>
>> Nice to see 7 MSK signals in your spectrogram. What was the bin width 
>> (or noise bandwidth or integration time) for the spectrogram?
>>
>> 73,
>>
>> Jim AA5BW
>>
>> -----Original Message-----
>> From: lowfer-bounces at mailman.qth.net
>> [mailto:lowfer-bounces at mailman.qth.net]
>> On Behalf Of N8OOU
>> Sent: Wednesday, January 10, 2018 2:26 PM
>> To: lowferlist
>> Subject: [Lowfer] Early morning VLF
>>
>> My view of 15-40Khz this morning had the normal trio of NAA,NLK, and NLM.
>> Also seen was NWC AUS, NPM HI, and TFK/NRK Iceland. An unknown signal 
>> at 31.2.  I had a medium MSK signal at 40.0, but as I was checking 
>> the online databases, the signal faded/ended. The database says that 
>> should have been JJY Japan.
>>
>> The screen capture is here;
>> https://www.dropbox.com/s/70jyskhhy4yj5t0/VLF01101805AM.png?dl=0
>>
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