G8JNJ
About
- Username
- G8JNJ
- Joined
- Visits
- 3,447
- Last Active
- Roles
- Member
- Points
- 400
- Location
- South West UK
- Callsign
- G8JNJ
- Additional information
- https://g8jnj.net/web-sdrs
Reactions
Comments
-
Some other options here https://www.fenu-radio.ch/en-index1.htm Personally, as guidance, I wouldn't pay more than approx £100 GBP / 120 Euro or US Dollar for a commercial loop. Beware of Chinese made loops, they are of questionable quality and the…
-
LKZ1AQ or Cross Country Wireless. https://active-antenna.eu/ https://www.crosscountrywireless.net/ But before you buy anything, have a look at the loop antennas IO group. https://groups.io/g/loopantennas Several KiWi owners on there, and loop P…
-
Just a thought, I know it's only semantics, but maybe to alleviate the issue mentioned. Perhaps reword the "Antenna switch is not configured." to "Antenna switch not in use" to shift the emphasis from admin function, to user inf…
-
I have noticed on two separate KiWi's, that with the antenna switch in the control panel, antenna mixing is allowed, until you go into the admin GUI, select the antenna switch extension then turn the mixing off, on and off again, then it performs as…
-
Am I missing something ? What is the problem with using an image with version 1.665, and then using the update procedure to version 1.666 ? Regards, Martin
-
Go to the admin GUI select the update page. Check for software update and select "check now". If an update is available Force software build and select "build now" The build will commence and the KiWi will reboot after approx 2…
-
You can set the calibration in the admin / config GUI. Ideally you should use an external calibrated signal generator, but I have found that :- S-meter calibration (dB) -13 Waterfall calibration (dB) -10 This is a good starting point, and p…
-
My KiWi 2 is the same as the KiWi 1. I have them fed from the same splitter and the performance is identical. http://wessex.zapto.org:8073 KiWi 1 http://wessex.zapto.org:8074 KiWi 2 You may need to check that they have the same S-meter and waterfa…
-
I wouldn't trust a Chinese made torque wrench. https://owenduffy.net/blog/?p=18806 It's unlikely that the KiWi will be repeatedly connected and disconnected as much as some other equipment. Slightly past hand tight is fine, and don't use a big adjus…
-
Hi John, Good job you included a CAT control interface to the KiWi :-) Regards, Martin
-
I also use an iPad and select the browser 'mobile' option, and for most things on the KiWi this works really well. A 'two finger tap' will also bring up many of the options that are not otherwise assessable. But I also wish Apple would stop adding '…
-
Yes, a good introduction. I just wish he had also demonstrated the TDoA function, which as far as I'm aware is not possible with anything else at hobby level. Maybe there will be a part 2. Regards, Martin
-
OK, Does the KiWi V2 board work when plugged into the Beagle board of a working V1 ? Regards, Martin
-
Personally I'm not that fussed, but Geolocation generally seems to work OK for me, and is usually pretty good with UK based users, other countries perhaps less so. I can usually 'spot' my regular users from their location information, even if they a…
-
The signal generator is one of the KiWi extensions. It generates an internal test signal, so it doesn't validate everything, but at least it will tell you if the software is working correctly. The easiest way to reflash your KiWi, would be to make a…
-
It's not clear to me if you have you got one good working KiWi, and if that KiWi is made up of a collection of parts from the KiWi 1 & 2. It seems to me like there are a number of problems here, and each one needs to be individually identified. …
-
Watch out if you are suing brushless fans connected to the DC supply feeding the KiWi. I have just built some linear supplies and found a couple of things. There was significant RF noise from the DC regulator (yes really) at frequencies below 1MHz. …
-
Hi Bob, Shop around for a Sunon Maglev, a bit more expensive, but they tend to last. https://forum.kiwisdr.com/index.php?p=/discussion/2559/fan-quit/p1 Note that all of these brushless fans tend to generate a bit of electrical noise, produced by t…
-
Wow, what sort of power level must have been present at the KiWi input to do that ? Even with relatively close spaced antennas, the coupling between them isn't usually that great. Most receivers will withstand RF levels up to about +10dBm, and I wou…
-
Also, how many users are connected to each ? The waterfall will slow down when there are multiple users. Regards, Martin
-
Beware of UPS's, some are VERY noisy. If you want to provide support if the mains fails, consider using a battery bank and powering the equipment directly. Regards, Martin
-
Hi Christoph, That is a brilliant bit of work, and I think Peter, G3PLX, would be interested too. Now to how to combine that with the TDoA function :-) I'm located about 15km away from the Wessex site, and I could maybe generate some low power sweep…
-
Does anyone know of an AM Bandstop filter with a bit less attenuation? Search through the forum, there are many threads on this subject. These should get you started on your journey. https://forum.kiwisdr.com/index.php?p=/discussion/comment/17132 h…
-
It may be that V1 was just on the edge of an acceptable PSU start up / close down voltage vs. time, and the V2 isn't. It is a problem with linear supplies, as they ramp up and ramp down much slower than switched mode designs, when connected and disc…
-
Works OK for me too. Operation for all modes are dependent upon the filter bandwidth in use, so the set point will vary. To mute the noise, NBFM typically requires a squelch slider setting of around 60, and NNFM requires a slider setting of around 7…
-
Thinking about this, it would be even better / quicker if the url extension could login and take you directly to a specified admin page.
-
Would adding an admin login password as a url extension associated with the existing /admin switch solve this problem ? or would it just be an additional security risk ? It would be handy to be able to directly login to the admin interface, without …
-
As I previously stated, the size of antenna element usually specified for such antennas have only a very low value of self capacitance, maybe less than 1pF. Any shunt capacitance that may also be present, forms a potential divider, and the already v…
-
The limitation with many PA0RDT antennas is the size of the plate antenna, which I consider to be too small. I've successfully used a 1m long whip in place of the capacitive plate, but I also include a series connected resistor and inductor, to act …