One more comment on this thread... The iSDR iPhone app utilizes the same digital signal processing techniques found in PC-based SDR receivers. It does frequency domain filtering using a theoretical

A variety of used, professional & prosumer grade digital recorders are on the market now, too. I've seen models by Edirol (Roland) and Zoom for auction and Buy-It-Now on Ebay, and there's a regular

Thanks Powell - I assumed that was the case. I've deleted the messages, and will keep his account active assuming he gets it sorted out. Kevin S Moderator

Hello Michael, Unfortunately I'm not familiar with the DSP uldx, so I can't provide an informed comparison. I have built resonant ferrite loop antennas for 3.5 MHz band, including the one pictured on

Hello All, Despite modest expectations the mid-summer LW propagation had some pleasant surprises this weekend, although DXers probably needed to sacrifice some serious sleep to take advantage of

Todd's machine is infected. So do not open any of these he has sent out. Powell NNNN POP email is powell at backroads DOT net

Hello All, Like Steve, I was able to track down two all-time new Ultralight beacons during the Ndblist "Barn Door" CLE-145 event (although neither one is as exotic as Steve's 400-ENS in Mexico,

Hi Jerry, My own audio recorder (which comes with MP3 conversion software) is the Sony ICD-SX57, a very compact model which can record about 3 hours of high quality stereo (if desired) in its flash

Thanks for your informed input, Charles. Very helpful. Can you suggest links to diy RF frontend designs? What aerial and frontend configuration is necessary for the iPhone DSP to equal a DSP uldx

I meant to mention one more thing: regarding SDR on other devices, like Android, Webos, QNX, Symbian, etc. The main thing preventing SDR on those devices is the lack of stereo microphone input. Note:

By purchasing a used or refurbished iPod touch, and building the RF front-end yourself, you MIGHT be able to set yourself up with an SDR receiver using iSDR for under $100. You can also get an iPhone

Jerry, I dont know what is used in the US, but in the UK we use "Audacity", which is freeware and, with an additonal easily downloaded dll file, allows you to record onto the computer in mp3 format,

Very sorry Guys re that list of Winnipeg Beacons the correct spelling is: Google Shawn Axelrod Logbook.

Gary, it was hard to tell on your sound file but that 248 Winnipeg Beacon (its from Lake Winnipeg I think), when I hear it here, has 6 quick beeps followed by 1 long beep over and over again. Can I

Hello, I started to measure two sw antenna's I have, one for 3-7Mhz gives 16.6H, the other for 3-18Mhz gives 3.7H. An idea I got was to place the last loop north-south and east west, and do the

Hi Gary, Many thanks for your prompt and detailed response. I am always impressed by the information and service available to the group. The "low cost ticket" article covers my queries nicely. I

Ginger, there are two variable capacitors on one shaft. The centre tag is common to both. The coil ends of your loop are connected between the centre tag and the one marked ANT. If you find the loop

Hello All, Expectations were pretty low for late-July propagation during the current "Barn Door" CLE145 (beacon-chasing) event sponsored by the Ndblist Yahoo group, but as mentioned last night, an

Hi Michael, <<< When you have time, could you use your empirical data to estimate the size of poor-mans-loop (triangular, circular and square, that would equate in performance terms to a FSL and

I think these are two-gang capacitors with one being between ANT and the center connection and the other from OSC to the center connection. The ANT one is the larger capacitance of the two.