Yearly Archives: 2016

Steve notes the ITU-R Recommendations on Radio Noise

SX-99-Dial

Commenting on our post about the FCC Noise Floor Inquiry, SWLing Post contributor, Steve Yothment writes:

One of the definitive documents on Radio Noise is the ITU-R Recommendation on Radio Noise, version P.373-12. This (latest) version is dated 07/2015, so it’s only a year old. You can download it [as a PDF] here. It has a lot of info on natural and man-made radio noise.

My favorite graph from the document is shown below:

Graph

It shows the level of radio noise vs. frequency for good and poor conditions. It can be rather surprising how noise, even under the best conditions, can be quite excessive on shortwave frequencies. For example, the best case noise level for 10 MHz is about 30dB above the Johnson Noise level. (That’s the noise level from just a resistor at room temperature.) That’s why the noise level in your shortwave receiver’s speaker gets so much higher when you attach the antenna!

That is fascinating, Steve! It’s no wonder we struggle with noise issues–even in the best of times, it appears.

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eBay sighting: Barlow Wadley XCR-30 Mark 2

Barlow-Wadley-eBayMany thanks to SWLing Post contributor, Neil Goldstein, who shares a link to this Barlow Wadley XCR-30 Mark 2 on eBay.

Barlow-Wadley

The Seller writes the following description:

Up for auction is a rare military green Barlow Wadley XCR-30 Mark2. The radio works perfectly. This is a late serial number 14995.

Please request a shipping quote before bidding as I will charge actual shipping. I will ship via DHL which takes around 7 days.

It’s important to note that detail about shipping since eBay shows shipping as $250. Since it’s being shipped DHL from South Africa, costs could vary greatly, I imagine.

Click here to view on eBay.

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FCC Noise Floor Inquiry

FCC-Public-Notice

Many thanks to SWLing Post reader, Bill, who shares this public notice from the FCC:

Comment Deadline: August 11, 2016

The FCC’s Technological Advisory Council (TAC), an advisory group to the FCC operating under the Federal Advisory Committee Act, is investigating changes and trends to the radio spectrum noise floor to determine if there is an increasing noise problem, and if so, the scope and quantitative evidence of such problem(s), and how a noise study should be performed. In this public notice, the Office of Engineering and Technology (OET) announces the TAC’s public inquiry, seeking comments and answers to questions below for the TAC about radio spectrum noise.

Click here to download a PDF of the full notice.

It’s at least encouraging that the FCC is investigating radio noise/interference–a serious issue for radio enthusiasts. Note that the comment deadline is August 11, 2016.

Thanks again for the tip, Bill!

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A16 version 2.1: Alan Roe’s guide to music on shortwave radio

Alan-Roe-Guide

Many thanks to SWLing Post contributor, Alan Roe, who shares his updated  Music on Shortwave list for the A16 period. This version (2.1) incorporates several suggested additions by SWLing Post readers.

Alan, again, thank you so much for publishing this excellent little guide!

Click here to download Music on Shortwave A-16, Version 2.1 (PDF).

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Correction: The Giant Jukebox broadcast time

MightyKBCTruck

I’ve just received a confirmation from The Mighty KBC that The Giant Jukebox will be on the air this Sunday (June 19) from 08:00-10:00 UTC. This is a correction to the UTC time in our previous post..

If propagation isn’t favorable where you live, consider tuning to 6095 kHz on Sunday via the University Twente WebSDR.

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Version 2.0? Julio’s positive review of the Degen DE1103

IMG_20151126_165751594_HDR

[Correction: Julio’s version of the DE1103 is the first, non-DSP (current) version.]

Many thanks to SWLing Post reader, Julio Cesar Pereira, who comments with his mostly positive impression of the DSP version of the Degen DE1103 receiver:

I’ve got a DE1103 and haven’t noticed any AM bleeding on SWL so far. I sometimes stay at one of my family’s properties located at the center of a city with lots of stations. There I use the balcony on the 9th floor and I get a lot of spurious interference from FM stations, which is normal once you’re surrounded by buildings. However, I already tuned some images on SW. I used an old SW7600G to check it out and it didn’t get any.

I kind of started to dislike DSP, for it can be annoying to hear it engage and disengage when a signal constantly drops down and recovers. It is fantastic when a signal is strong and constant for it improves audio quality whether it is MW, SW or FM.

At one time, I even thought it would be perfect for the DE1103 to have this [DSP] feature, but you know what? I’m very happy with the way mine is right now. I find this receiver to have the best FM reception compared to the others of my little collection of tabletop and portable receivers, which includes scanners ICOM IC-R20 and R5, receivers PL-660, SW7600GR, ICF-2010, etc. The DE1103 is by far the most sensitive and selective one, it even beats my old Realistic DX-440.

As for SW, I like the combination of its very good AGC and very low floor, which allows me to do DXing with the RF attenuator on and does not have any annoying filter like the PL-660. I also enjoy its audio quality, especially on the headphones, for it is more natural, not processed like the PL-660’s or over-processed like the SW7600GR’s.

You can tell I’m a big fan of this little radio. It has its flaws, but I can live with them.

Thank you for sharing your experience with the DE1103 DSP, Julio!

Degen DE1103 DSP Version 2.0?

Julio, I’m now very curious if your receiver is the “Version 2.0 Model” mentioned by this seller on eBay. [ Julio has now confirmed that it is not the DSP version.]

DegenDE1103-2.0

If you’ve read my DE1103 DSP review, you’ll note that I haven’t been the biggest fan of the new DSP version of the DE1103. I did review a very early model and wonder if Degen has tweaked the DE1103 DSP to provide better performance? Can any other readers comment?

I’ll search through the various models of the DE1103 on eBay and see if there are any specifics about the new 2.0 version in product descriptions. I’ll also attempt to contact sellers for details.

Please comment if you have any information.

Update: Several readers pointed out that the “Version 2.0” might simply be a way sellers are using to indicate that this is the DSP-based DE1103–rather than this being an improved version of the original DSP receiver I tested. 

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The Giant Jukebox is on the air again this weekend

MightyKBCTruck

Many thanks to SWLing Post contributor, Thomas Ally, for noting that The Mighty KBC has announced that The Giant Jukebox will be back on this air this Sunday, June 19 at 10:00-12:00 CET (8:00-10:00 UTC) on 6095 kHz.

If propagation isn’t favorable where you live, tune to 6095 kHz via the University Twente WebSDR.

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