G8JNJ
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Hi John, This week I've been trying to use a number of KiWis to perform some antenna field strength measurements, but its been a somewhat frustrating process. So I'd also like to echo Jim's request for an option to allow the the S-meter logging pe…
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Hi, Yes, you would need to use an active splitter an 8 way passive would have about 12dB through loss which is likely to be excessive. General rule of thumb (approximate) attenuation when using cheap satellite TV passive splitters:- 2 ways 3.5dB …
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Perhaps a 12v Gel cell and an analogue 5v 3A regulator ? Not one of the modern switchers or LDO designs but something like an LT323AT or similar ? Regards, Martin - G8JNJ
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Hi, OK that sounds promising :-) I'dd certainly try a 1:1 Balun on the antenna coax next. The great advantage of the KiWi is that it's got it's own built in spectrum analyser, so if you add a small directional antenna such as a loop, it's very ea…
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Hi Ben, I've had some discussions with Oskar (the software author) about various aspects of CATsync and I've already asked if he could add CAT radio emulation, like the CAT to HDSDR option in HDSDR, so that other stand alone programs with CAT contr…
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Hi, You should be able to get away with it if the antenna has a high enough gain amplifier to overcome the cable losses without degrading the Signal to Noise ratio. The S/N ratio is generally set by the device used as the amplifier in the GPS ante…
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Hi, OK, it's quite possible that the 4:1 Balun is a or 'Voltage' balun (check to see how many cores it's wound on. If it's only one, and has DC continuity from primary to secondary, it will be), which will have very poor common mode rejection. To…
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Hi, I've also had a listen and it does seem quite bad, especially around 6MHz. I notice you are using a delta loop antenna. Has it got any sort of Balun attached to it ? If not I'd suggest trying a decent 1:1 choke balun. Try some thin coax wound…
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Hi John, Ah OK, I hadn't realised the significance of "80m_JA" as my understanding was that this is a new IARU proposal affecting all regions. Regards, Martin
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Hi John, Also be aware that there is some controversy regarding the frequencies used for WSPR on 80m. "with WSJT-X v1.8 we intend to correct an anomaly that has existed for a long time in that Japanese amateur radio operators have no privileg…
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Hi Marco, I'm also using the LZ1AQ loop amplifier, but my signal levels are no where nearly as good as yours. http://southwest.ddns.net:8073/?ext=ant_switch I understand that you are using four crossed loops ? Can you describe your loop antennas…
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Hi Ron, Reducing the loop inductance (for a given size) is something worth trying if you want to improve the performance still further on the HF bands (>10MHz). This is less critical when you are using a loop amplifier with a fairly high input …
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Hi John, It had been off for a while, then it reappeared, as I definitely heard on a few web SDR's whilst checking for the mystery 36KHz signal reported by ratwolf on the 18th of May. But I checked again today and it's not there any more. Maybe…
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Chrome Version 49.0.2623.112 m
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Hi John, Great thanks. Today I used an old laptop running Chrome under XP and noticed that I couldn't add, delete or edit anything in the frequency entry box, so this may also be a related issue. Firefox was fine. Regards, Martin - G8JNJ
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(Quote) Yes, either by means of entering the URL directly into a browser (so that links to the Kiwi including frequency, mode and antenna can be posted) or by clicking on a label in the KiWi GUI. (Quote) Great, that will help ID which stations have …
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Hi, See this thread http://forum.kiwisdr.com/discussion/comment/3713/#Comment_3713 It's also a problem with other WEB SDR's http://hackgreensdr.org:8901/ChromeHTML5.pdf Regards, Martin - G8JNJ
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Hi All, A new release of CATSync is now available and this one allows tuning of an external radio (or HRD) via a click on the KiWi waterfall. Tuning the radio also sets the KiWi frequency. https://catsyncsdr.wordpress.com/ However, tuning by clicki…
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Hi John, This is great. Hopefully at some point it can be made to auto switch and run in the background only when spare receivers are available for use (or not all fully being used by others). In the meantime in order to make the best use of just o…
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My thanks to John and Christoph for providing this. It's a brilliant bit of work. Regards, Martin - G8JNJ
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Hi Steve, All good. A few points to consider. Height above ground does matter, but only up to a certain point. The key factor is the Signal to Noise ratio produced by the antenna, so once you get above a signal level that overcomes the noise floor o…
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Hi Steve, I'm sorry to say that neither of those two look that good to me. The signal levels seem incredibly low, have you got an attenuator, splitter or anything else between the antenna and SDR ? I tried your SDR but the switching is disabled at…
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Hi John, I may be wrong, but to me it looks like there is a scaled-down version of a browser running within both of the applications that have been mentioned. Regards, Martin - G8JNJ
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Hi John, The demo version is free so you can try it for yourself. The only demo limitation is that you have to click on the frequency entry box to tune the WEB SDR rather than it being fully automatic in the paid version. It is similar to CSVUserli…
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Hmm, Maybe I spoke too soon............ It turns out that "It only to controls the websdr (as advertised) via CAT not viceversa" I think most folks would probably want to use the SDR as a pan-adaptor to click to tune their radio to see if …
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Hi Ron, See my earlier post dated March 16th in this thread. You may also be interested in this. I found the following on this website https://topbandchordalhopper.blog/2018/01/15/the-wellbrook-ala1530lnp-loop-vs-the-mfj-1886-loop/ "Anyway, I h…
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Wow, that's an impressive 'hole' :-) I must admit that I hadn't realised that there were fixed 'holes' in GPS coverage, as I'd always assumed it was a whole earth constellation. That explains why I've always had a slight null to the north, which I p…
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Hi Ron, t look good to me. My only suggestion would be to space out the input filter network and protection diodes a bit more so that you have some space to try different input arrangements. For example, if you wanted to add an input transformer, ad…
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Hi Ron, I see that MFJ has rather kindly provided the circuit diagram for their broadband active receive loop the MFJ-1886. http://www.mfjenterprises.com/Downloads/index.php?productid=MFJ-1886&filename=1886%203.8%20schematic.jpg&company=mfj…