The KiwiSDR 2 online store is open for orders! Please visit kiwisdr.nz
Please visit kiwisdr.com (documentation) and kiwisdr.nz (online store)
n6gn
About
- Username
- n6gn
- Joined
- Visits
- 4,800
- Last Active
- Roles
- Member
- Points
- 22
Comments
-
Martin Have you ever checked to see if there's a noticeable improvement in performance by pointing the 'main lobe' toward the equator? From that spec sheet it looks like there could be several dB of directivity available. I've never checked to see.
-
This is my point as well. Differential QRN really isn't a problem in any of the many Kiwi's I've seen. The problems seem to always be related to common mode currents in/out and through the Kiwi's. At low frequencies it's certainly not "radiati…
-
Yes, that was sort of the general direction of what I was wondering about but I suspect it might best be done at a high Z location, perhaps on the mains side. There total current might be 25-50 times lower than at 5V. Two buck converter SMPS that c…
-
Getting rid of differential noise is fine, though the power management IC regulators in the Kiwi's BB is so good that this is seldom to never a problem, in my experience. (Try deliberately introducing differential noise and check the Kiwi's response…
-
I think the question was reasonable since it was "using down converters". For this reason using a frequency converter/extender such as the 0-2 GHz transverter I use here suggests the value of having many additional bands listed as options…
-
[I never thought I'd be saying this seriously but ] They seem to be on frequency compared to GPS constellation here in Fort Collins at 1440 UTC. Perhaps whatever you saw has been repaired? If not, I can get hold of Matt....
-
Are we on the verge of trying to shoe-horn an entire instrument state into Antenna Selection? Should/could this be done better if there were simply a mechanism to call a separate process or script outside of FW that 'does whatever is needed"? …
-
I think that's it. With the per-kiwi trick it almost works now. Assuming I also send a command to the local frequency converter to tune it as well, sending http://192.168.10.75:8076/?foff=120000.000&f=145200usbz0&mute&keys=yyys to a loc…
-
I really haven't thought this through very well. The possibility to use Antenna Switch as a way to easily select among different offsets seemed appealing and not requiring reloading the entire page from a different URL and clicking a couple of tim…
-
At the risk of topic drift I'd like to ask if there is a way to produce seamless Antenna Switching when it is used with computer control? I'd like to be able to change only the LO offset so that in conjunction with tuning a separate frequency conv…
-
If it were me, I'd first take the antenna and GPS SMAs off, see if it goes away (it probably will) and then touch only the shield of the cable to the "ground" of the SMA to see if it might be common mode current through the Kiwi's ground p…
-
Not seeing it on v1.690 but that sounds great. I really like the ability to use the Antenna Switch to change bands too. That lets me remotely configure frequency conversion and Kiwi dial, at least I think it does. Glenn
-
Option of powering up with no DX labels, just spectrum, waterfall or both. Effectively the 'yyys' I do every time done for me.
-
I worked in an HP microwave lab and as I remember the production line spec for torque was surprisingly low, only 7 inch-pounds. That was with quality connectors on the highest quality vector network analyzers as well as on swept signal sources. As t…
-
It's not true that beam forming and noise cancellation can only work on a narrow band of frequencies. By using a broadband antenna system such as the quadripole I show on my web pages along with a multi-decade quadrature network, also shown there,…
-
That will be great as far as I can tell. All we can ask for is what the user entered as the ext clock frequency. Hopefully the HW is adequately referenced and has provided what he entered. Thanks for doing that.
-
Yes, I wasn't sure that it was clear that we needed to know the ext clock frequency as well as its presence. Thanks John.
-
Is there a chance of having an output on the status page that allows access to the present ext_clock frequency added to status? It seems that among ext_clock, frequency, GPS or not and versions it has become a bit complex. There has become a matr…
-
It's on a remote with v1.616 and external GNSSDO 66.66 MHz clock. I was attempting to update it but have since thought better of the idea and done some experiments on a similar system here at the QTH, looking at boundary spurs and phase noise. Runn…
-
OK, didn't know how you used the diff. But that's the end of an attempted update on the console. Nothing more happens, no update and no error other than it didn't update. The local Kiwi updated fine. I can send you the entire console output if it h…
-
Trying to update both a local and a remote KiwiSDR to 1.653 in order to compare reported frequency of a known OTA FST4W LOS signal to see how much error a 66.66 MHz clock introduces with the newest code. The local seems to be proceeding OK but the …
-
1.650 reads-72.8 dBm for my -73 dBm at 14.1 MHz source which is well below the measurement uncertainty of my old S-Meter calibrator. Noise in 10 kHz is similarly very close to expected, but of course noisy. I like the extra displayed resolution.
-
The amplitude reporting, S-meter and dBm field, do seem to be several dB down from previous code. I just checked and found this to be true on both noise and coherent signals so I doubt there's a substantive SNR change.
-
Ah! It hadn't occurred to me that a local user had higher priority than a wide area one and therefore special permissions. This points to either Rob or one his designate admins to having caused the problem. But of course his secret is safe with us,…
-
You can test this yourself by driving across the ends of the PCB from a 50 ohm swept HF source at a known power level. Calculate the current through the ground planes and compare that to the Kiwi's response, which should have a noise floor around -…
-
Every SMA on the antenna end of the rx probably should be isolated and not just for consistency. This is because attaching any of them to the enclosure creates a CM path through the groundplane at that end of the PCB and an attendant IZ drop which …
-
Thanks John. If I can arrange the the timing to have the new subnet up after a reboot but before the BB looks for a network that could work. But if I'm too slow, doesn't the BB just sit with no network at all if the new subnet isn't , having genera…
-
Steve_MWC asks: "Lastly, the transformer is really not operating as a balun. Both sides are unbalanced but isolated. Does anyone actually want to connect a truly balanced input to their KiwiSDR. Perhaps using balanced feedline rather than coax?…