Category Archives: New Products

Inside the HanRongDa HDR-737 wide frequency receiver

Many thanks to SWLing Post contributor, Nad, who writes:

I bought an HRD-737 a few weeks ago off AliExpress. Was going to write a review but now feel there is no point because it has so many major and minor problems beyond those already reported.

Decided to take mine apart. The photo is attached.

Click to enlarge.

It appears to me that the HRD-737 could be the first attempt at an SDR-based pocket sized receiver. Wondering if you or someone the experts at SWLing Post can offer any insight in this regard. Identifying marks on the ICs have been removed. The metal can in the middle could be a wideband programable oscillator of some kind?

Thank you for sharing, Nad!

Readers: can you shed some light on the HDR-737 receiver design based on this internal photo?  Please comment!

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A new portable DRM/DAB receiver by Starwaves GmbH

Many thanks to SWLing Post contributor, Mangosman, who notes:

There is a new digital receiver available. It can receive DRM in all bands from low, medium, high and band 1 & 2 VHF, as well as DAB+ and analog AM and FM.

It cannot receive HD radio because Xpedia charge licensing fees on every receiver and the market is restricted to USA and Mexico.

Thank you for the tip!  It appears this receiver is a product of  STARWAVES GmbH, Germany/Switzerland, although I assume it’s manufactured in China based on the bulk order costs.

I’ve reached out to the manufacturer for more details as there are few specifics and no specifications on the Alibaba page.

There are also no details about this radio on the Starwaves website.

If/when we receive more information about this radio, we’ll share it here on the SWLing Post. Stay tuned!

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Any reviews of the HanRongDa HRD-737 portable radio?

Many thanks to SWLing Post contributor, Jamie Anderson (KM4WYO), who writes:

I have been browsing around eBay too much and was trying to put together a do-it-all radio for camping/backpacking that is small.

It is hard to find SW/broadcast/weather/air band together (for good reason, of course). I did run across this radio that is interesting: the HRD-737 which retails around $40.

  • Internal 700mah 3.7v lithium, with 5v usb charge
  • Air 118-138 MHz
  • FM 87.5 – 108 MHz
  • AM 520-1720 kHz
  • CB 25-28 MHz
  • SW 2-30 MHz in 5 kHz steps
  • VHF narrow/wide FM – 30-223 MHz (10,6,2,220)

I’m not sure if it would pick up NOAA stations as I think they have a slightly different FM bandwidth.

It seems interesting for a do it all point of view, you could possibly monitor ham repeaters on 2 meters, just a little too short of frequency coverage for 220.

Click here to view the HDR-737 on eBay.

Have you seen one of these or something similar in your reviews?

I have never used the HDR-737, but thanks for bringing it to our attention, Jamie!

I should think, assuming the stated VHF frequency coverage is correct, that you should be able to hear weather radio on this receiver. NOAA weather frequencies are on 162.400, 162.425, 162.450, 162.475, 162.500, 162.525, and 162.550 MHz.

The manufacturer isn’t clear about the frequency steps on VHF however–it’s possible tuning increments could be too coarse to get a good lock on the station. That specification is omitted altogether even though every other band has stated frequency steps.

I should mention that the original C. Crane CC Skywave meets all of your specifications save the ability to potentially tune in the 2M ham radio band.

Post readers: Is anyone familiar with the HanRongDa HRD-737?  Please comment!

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The NSA’s Software Defined Radio application “RedHawk” is now open source

Many thanks to SWLing Post contributor, Andrew, who writes:

Not kidding, a friend told me that NSA released a bunch of software to open source, the main list being here:

While looking at the list of projects on that page, halfway down the page, I found a project called “RedHawk” which is described as:

“A software-defined radio (SDR) framework designed to support the development, deployment, and management of real-time software radio applications.”

Now, being curious I opened the github link:

[It] contains quite a number of subprojects, modules and other stuff, then I checked the main “RedHawk” project:

Here’s the documentation:

It seems really interesting; apparently it allows to define a wealth of processing stages (e.g. filters, converters…) and connect them to process signals coming from an SDR; I think it may be a very interesting and useful tool to fiddle/experiment with SDR receivers, if I’m not wrong it may allow to push an SDR to the limits, improving its performance, and may also be useful to write SDR software!

Fascinating! Thank you for the tip, Andrew!

Post Readers: It appears this project has been in the public domain for a little while. Please comment if you’ve tried implementing RedHawk in your SDR system!

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New release of Win4K3Suite includes broadcast EIBI schedules

Many thanks to SWLing Post contributor,Randy (KS4L), who shares the following update via Tom Blahovici of Win4K3Suite:

There is a new release of Win4K3Suite.

This release adds a number of new features. One of these is bound to bring you back in time…Win4K3Suite now includes the ability to search and display Shortwave radio stations if you have the general coverage option in your radio. This is made possible by supporting the EiBi database ( which is published 4 times a year. Here is an example of this in use with the built in Panadapter of Win4K3:

In addition, there are a number of additional new features and improvements such as a 1kHz snap in the spectrum and quicker resets of the ClubLog window.

You can find out more about Win4K3SUite here: and at the website

There is a free 30 day fully functional trial.
73 Tom

Thanks for sharing this, Randy! Since the KX3 and KX2 are some of my favorite portable broadcast receivers, this is a most welcome development. I may have to give Win4K3Suite a try!

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