Is there a "lightweight class?" Sony SRF-T615


Les Rayburn
 

This morning, I was attempting to troubleshoot some problems with another portable. I ended up doing a backyard performance test of several portables just to establish baseline. 

The targets for testing were: 

WSM, Nashville 650 AM. About 200 miles distant. Their 50KW signal means they are a fairly easy daytime DX target. 
WJOX, Birmingham 690 AM. Local pest station. Their 50KW signal means wall to wall signal. 

Test were conducted outside the house, in the quietest spot in my suburban RF hell. 

Radios tested were: 

Sangean PR-D5
Tecsun PL-380
CC Crane Skywave
Sony SRF-T615

The results were interesting. The clear winner was the heavyweight Sangean PR-D5. WSM was easy copy. Not armchair strength but certainly strong enough to listen to a game or your favorite song. With the local, it could null their signal deep enough to allow traces of another station underneath. 

Second would have been the CC Skywave (on 1KHz bandwidth setting). Able to copy WSM well enough to pick out a song or ID. Deep null on WJOX but not deep enough to completely bury the signal. 

The Tecsun PL-380 received WSM about as well as the slightly smaller Skywave, but could not achieve quite as deep a null. Again, using the 1KHz bandwidth. 

Then the lightweight of the division, a true ultralight. The Sony SRF-T615 could not detect any audio from WSM 650 but did achieve the 2nd best null on local WJOX. It put their signal into the mud, almost completely gone. At night, this ability comes in very handy. 

When it comes to performance, I wonder if we’re not also “weighting” results based on those seeking TA and TP targets. Searching for those stations, the 1KHz DSP bandwidth is critical for success, but for those chasing domestic targets, it’s not as much of a factor. 

The Sangean PR-D5 has a fixed bandwidth and beautiful sound. It’s big and heavy compared to the others but it’s a great radio for AM DXing. 

The Sony SRF-T615 is a true ultralight, fitting easily into a shirt pocket. Used with headphones, it’s a wonderful machine to take when walking the dogs. Searching for domestics, both are quite capable. The Tecsun and Skywave are probably better choices for DXing TA and TP targets. 

Fun test. Should have thought of it sooner. All of these have been in the house for months or years. Maybe we need weight classes or two scales—one for TA/TP Performance and another for Domestics. 




73,

Les Rayburn, N1LF
121 Mayfair Park
Maylene, AL 
EM63nf

Member WTFDA, IRCA, NRC. Former CPC Chairman for NRC & IRCA. 

Elad FDM-S2 SDR, AirSpy SDR, Quantum Phaser, Wellbrook ALA1530 Loop, Wellbrook Flag, Clifton Labs Active Whip. 



Clyde Smith <hkryclyde@...>
 

forgive a stupid question but what are ta and tp stations????
thanks clyde


Camille LeBlanc
 

Hello Clyde,

TA means Trans Atlantic
TP means Trans Pacific

Listening for stations beyond or outside of the western hemisphere

In most cases these stations are on 9 KHz channel spacing vs the 10 KHz spacing we have in the Americas (North, Central and South)

Hope this answers your question.

Regards
Cam
--------------------------------------------

On Mon, 3/7/16, Clyde Smith hkryclyde@yahoo.com [ultralightdx] <ultralightdx@yahoogroups.com> wrote:

Subject: [ultralightdx] Re: Is there a "lightweight class?" Sony SRF-T615
To: "ultralightdx@yahoogroups.com" <ultralightdx@yahoogroups.com>
Received: Monday, March 7, 2016, 10:12 AM


 









forgive a stupid question but what are ta and tp
stations????

thanks clyde











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Clyde Smith <hkryclyde@...>
 

thank you very much. should have recognized the abbreviations. clyde


keith beesley
 

I love my PR-D5s! I have a white one I bought new several years ago, and a black one I found recently in a thrift store for $5! (for some reason, radios often seem to come to me in twos). Both work perfectly and they're among my favorite "general purpose" radios--great reception, good sound (better on FM than AM), easy to carry around from room to room or outside on a nice day. 

A similar radio I like a lot is the Sangean H201 "shower radio," far more than just an average bathroom radio. Sturdy build, reception as good or almost as good as the PR-D5 despite having only a small wire antenna for FM, and it also gets the NOAA weather forecasts. 

Keith Beesley
Seattle WA 


Guy Atkins
 

Hi Keith,

I share your enthusiasm for the PR-D5 and the newer model PR-D15.

A couple months ago I purchased both the D5 and D15 to try out for close comparisons of DXing performance, features, and ergonomics. 

For me, the D15 won out easily. It surpassed the D5 in half of the DXing tests of selectivity, and was always equal and often better in terms of sensitivity. The handle of the D15 makes a big difference for ease of use in my opinion.

The D5 was returned to Amazon but the D15 is a keeper and I use it every day. On a recent visit to the Oregon coast I had fun pulling in some TPs with the barefoot D15, as well as with my SDRs and other radios along for the trip. I'm finding the D15 to be very versatile and useful. Rarely do I find a radio to be just as adept at everyday, common use around the house as it is a DXing receiver!

73,

Guy Atkins
Puyallup, WA


keith beesley
 

Thanks Guy, good to know. I may have to add a PR-D15 to my "wish list."

Keith Beesley
Seattle WA USA


On Tuesday, March 8, 2016 10:31 AM, "dx@... [ultralightdx]" wrote:


 
Hi Keith,

I share your enthusiasm for the PR-D5 and the newer model PR-D15.

A couple months ago I purchased both the D5 and D15 to try out for close comparisons of DXing performance, features, and ergonomics. 

For me, the D15 won out easily. It surpassed the D5 in half of the DXing tests of selectivity, and was always equal and often better in terms of sensitivity. The handle of the D15 makes a big difference for ease of use in my opinion.

The D5 was returned to Amazon but the D15 is a keeper and I use it every day. On a recent visit to the Oregon coast I had fun pulling in some TPs with the barefoot D15, as well as with my SDRs and other radios along for the trip. I'm finding the D15 to be very versatile and useful. Rarely do I find a radio to be just as adept at everyday, common use around the house as it is a DXing receiver!

73,

Guy Atkins
Puyallup, WA