The KiwiSDR 2 online store is open for orders! Please visit kiwisdr.nz
Comments
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If you think that's bad just try crowd funding some sort of civil disobedience gathering.... ;^> See how fast your accounts get frozen then!
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Great news on the prototype! Thanks for clarifying on the "HiFi" 5v PS. But I think we can still do better ourselves. Hard to be sure from the CAD screen shots but I don't see a input line filter, there's no crowbar output protection wh…
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I am not just thinking of audio muting, but the front end. I know there are diodes, but I don't like to rely on that.
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"While an internal mute would be handy, there's some logic level driven relay boards available on the web that one could used for this purpose . The good news is that they're remarkably cheap. It's not an audio mute, but at least it should be c…
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Agree with your comments re: pypl. Credit card is still a good option in my opinion.
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When you say "Hi-FI" 5v linear supply do you mean something like this? https://www.ebay.com/itm/164919042920 Have you investigated these then? I was looking for something that has a crowbar circuit on the output but haven't found anything…
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This is awesome news. There doesn't appear to be a cooling fan in this design is that correct?
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Hi Martin I'm suggesting that the wideband response is a feature which can be leveraged in this case. A typical lightning detector is a narroband affair with a simple level threshold detection which is prone to many things that can cause a false po…
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Thanks for your comments guys and yes I understand the frequencies are not strictly fixed but agree Martin that due to the enormity of the antenna arrays they tend to be optimized for a fairly predictable range of frequencies. The thing is right no…
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Oh boy! Thank you for this John. I was just going to ask about this and searched it first and found this thread. If there is a special interest, what is the best way to go about finding or getting it added? Example, I am interested in recent OT…
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With the addition of the attenuator is there any possibility that an input could be added for muting via an external PTT signal? It would be really nice for those of us who use the KiwiSDR along with an amateur radio station without having to deal w…
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I got part way down this rabbit hole. Now that John has kindly provided a CAT string on the USB port which contains the vfo frequency, I have an arduino sketch which reads the CAT string and outputs a voltage on a DAC pin that can tune my varactor …
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Just for the sake of completeness and in case someone looking at this thread for an isolation transformer for a higher frequency range I include two more much broader sweeps. First the two turn and then the four turn transformer. Both seem to have…
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The same core with four turns on either side. Definitely an improvement on the low end at slight expense to the upper end of HF. I edited the previous post to add a zoomed in scan of the low end of the two turn transformer for comparison. Below, …
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Hi Martin Are you referring to the lossless feedback amp I saw breadboarded on your website? Joe -ve7vxo
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Well it has been a long time since I posted on this thread but I finally got round to completing this isolation transformer. I used the layout files provided by N6GN. The minicircuits transformer was unobtanium so I made my own. I used a TDK Epco…
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Yes I have some BN-73-202 cores already, they are a little large for the PCB but I can make it work by bending the leads underneath. I was going to go with the conventional wisdom of primary Xl at least 10x the Zo of the line so two turns is enough…
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Martin, thanks for the advice. I will definitely consider the series combo of isolation transformer and transmission line style CM chokes. On both ends of the line if necessary. My passive antennas have the isolation transformers already, active …
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@N6GN: Thanks for the encouragement. I find myself once again in a high noise environment perhaps not as bad as the suburban one I left but still disappointing considering I moved to a rural area. Previously I was able to battle the noise using a …
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I am about to re-deploy my kiwiSDR after moving to a new location and have ordered the circuit board from OSH park using the layout files posted on another thread here. Digikey has the minicircuits TC1-1 which is essentially a T1-1 with center tap …
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oops I spoke too soon! When I click on a carrier it places that signal in the passband center rather than placing it at the chosen CW offset.
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John Thanks for adding the pass band lock function on this revision. It works exactly how I like now that I can shift the filter and save the shifted skirts with a fixed CW offset. Kudos to you and best regards...Joe
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Wonderful news and thanks so much for doing that John. Best regards...Joe
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Hi John, I like that the default bandwidths are configurable, however I think the way they work could be improved. When adjusting the upper and lower skirt, the offset frequency is recalculated. This makes it impossible to set a filter shift as de…
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I guess I just answered one question for myself. WSPRnet.org does indeed allow latent uploads so the idea should work at least from that perspective. Joe