Monday, May 21, 2018

CONUS-wide Gospell GR-216 review!

Special thanks to Haochun of Gospell for the demo unit. As you will read below, we really put it through its paces. Haochun allowed us a test unit and this single radio was all over the USA in states from the West Coast to the East Coast in 6 months.

We were particularly fortunate to present the demo unit at NASB 2018 at SonSet Solutions in Elkhart, Indiana. Kuwait DRM came through for a solid hour on two frequencies from 7000 miles away! Here is a short clip as an example. If this doesn't convince you that we have a winner here, then nothing will!


It is a pity there is so little DRM available in North America. After our experience with Kuwait, the consensus is that the GR-216 works well overall and very well with DRM (remember, this is an early release with early firmware) and I believe it represents hope that tabletop DRM reception is now within reach!

Fibber:

I have been taking my time to enjoy the new GR-216. The unit is a full featured table top with traditional AM and FM offerings plus Shortwave and DRM (for AM and Shortwave bands). Build quality is really nice. It is a solid feeling radio, with a crisp looking LCD display. It sports BNC connectors for antennas and RCA and 1/8" jacks for audio output. It has a physical switch for using internal versus external antennas.

I'm going to quickly cover AM and FM reception. Here in the Pacific Northwest, DRM is just about non-existent currently. Shortwave reception is fair this time of year so here is an example of daytime VOA Korea.


On a quick trip to the Oregon coast, I caught this Classical music station transmitting full RDS. Nice to see the scrolling text descriptions on such a nice, bright display.



I did have several brief opportunities to compare signal levels on DRM brodcasts. Kuwait and Romania both presented on the radio, Kuwait with bits of audio. I ran these concurrently with a recent build of DReaM and found the Gospell comparable to what I was getting via the ELAD FDM-S1 using DReaM.

I must say that the variable AM bandwidths have quickly become my favorite feature. The wide settings are more than generous for high-fidelity listening. The medium and narrow settings provide the ability to avoid adjacent squawk in even the overcrowded 49M bands on my West Coast mornings.

If I had any suggestions with would variable AGC options for AM and possibly speaker modifications as the AGC seems to on-occasion clamp and then release on deep fades to big signals, causing physical speaker distortion or almost rattle even. No doubt some of the problem is simply a firmware adjustment.

This is by far the most stout and robust feeling DRM receiver I have encountered. Once the price-point approaches that of conventional (but high-quality) tabletops, we will have a global winner here. xHE-AAC compatibility on DRM too, so this one will be ready for my Global DRM Domination plan!

BRENDAN:

First Impressions: after the box arrived, I carefully pulled out all of the contents and studied the radio itself. Larger and heavier than the DR111, it has a sturdy plastic case and knobs. A separate 110V power supply with Euro-style pins had been sent along, but a pin adapter fixed that issue. Plugged it in and was greeted by the radio as it booted up. It worked!

But what kind of radio is this? Is it a geek's radio or a consumer's radio? It's a bit of both actually. You can choose to just set and use the memories and be happy, or manually tune it and listen to DX. With both internal antennas and BNC connectors for external ones, you can choose to use it as a tabletop receiver in the kitchen or living room.  Think of it this way: the looks of an MW/FM receiver, with a decent HF SDR receiver inside.

Build quality is something I'd like to talk about before my operating observations. The case is sturdy, but the knobs and buttons need a better mechanical foundation. They are wiggly when they're not supposed to be and feel cheap. The sub-assembly that the front control buttons are attached to is not very strong, since a single button push would move them all within their casing holes. All controls actually worked fine, so the electrical aspect was good, just not the structural assembly. The main tuning knob is used for several functions just like the DR111, but it too needs some work. It often overtunes (too fast), even in 'slow' mode, so manual tuning has to be carefully done, and the detents in the knob's action don't help either. There is an extensive frequency/channel memory system built-in, but I did not use it.

Operating the radio, I found not all controls to be entirely obvious, nor did the instruction booklet provide much help actually. I still don't really know what "VF/VM" means, outside of perhaps meaning "Visible Frequency/Visible Memory." Never did function that I could tell...

However, most of the other control functions were easy to understand and/or figure out, so I was able to get it working reasonably quickly. Analog FM reception is quite good, and I was pleased at the fringe reception results for my location. The GR216 has a good speaker, and you can separately adjust the treble, midrange, and bass using the button control commands, a neat touch (no extra knobs). Stereo outputs are available on the back plane, so you can connect the radio to an ouside stereo system. A 3.5mm headphone jack, 2 RCA connectors for both channels, and power inputs.

Analog MW/AM operation was very straight forward, and proved to be quite good with external antennas connected. The internal antenna was not that good in my experience, due to AC hum like I have not heard in years. The FM band was only somewhat affected by the hum, but the MW/AM band was virtually useless. Not even the local MW stations located only about 5miles/8Km away completely overwhelmed, making listening very difficult. Connect an external antenna and the noise disappears, WITH the same power supply. Hmmmm...

HF analog reception was good, especially with an external antenna connected, but the internal rod antenna was not that effective for HF purposes.

A very neat feature that works on all modes is what appears to be an automatic filter bandwidth  setting, and it works well. I could set the radio to FM, tune a local station which would then show a wide(r) bandwidth, while moving to what is a DX station showed a narrower width. Very effective, even on HF.

While I could not 'catch' any DRM signals during my review period, I have no doubt that the GR216 would work well, based on my previous experience with my own DR111. I would also rate the GR216 as a better all-around radio than the DR111, given the higher quality speaker and more refined operating controls.

In summary, I found the GR216 to be a good consumer-oriented radio. The bells and whistles that we enthusiasts like are there, but this is a radio even my 88 year mother could use once set up. She is not a tech whiz, and has difficulty with a smartphone, and I do cut her a lot of slack (she is my mother, after all!). For most people, this radio will be enough for them, and it certainly would be for my mother.

A good effort, now make it smaller!

MEL: 

My reception of DRM has always been with a ham transceiver (Flex 5000) and DREAM software which meant I had to boot up a computer and load software. With the GOSPELL, power up is immediate and ready to receive. For me, this was nice.

As we know, there isn’t much DRM available now due to poor propagation and the loss of stations on this continent. But I was able to decode the State of Kuwait well here in the Midwest. A couple times I decoded a few words from Radio Romania International on 6030 kHz. The GOSPELL displays the sending stations transmission parameters including SNR which tracks within a few dB of what DREAM reports.

There was little difference in the decoding sensitivity between the Flex/Dream and GOSPELL. The dropouts are handled eloquently with soft fade out/fade in vs. the more abrupt off/on of DREAM. Audio fidelity was very good. The front firing speaker was great and headphones worked well using the rear “socket” connection.

Functionally, all the controls and memories worked as described in the GOSPELL user manual. Programming the memories was not real intuitive (stores up to 20 frequencies across 5 banks) but I soon got use to storing/recalling them. The radio’s confirmation “beep” is not set as a default but I believe would make memories easier to use. The two alarm timers are very loud so no fear of missing a scheduled time to listen!

For antennas, I used a “ham bands only” Yagi and 52 foot vertical. There are separate BNCs jack for connecting both FM and AM(DRM) antennas. I found the whip antenna adequate for medium wave and some shortwave listening and great for local FM stations. I did very little listening on AM shortwave, however the sensitivity/selectivity was good for the bands I scanned. Both slow and fast tuning is available on 15 bands (530 through 26100kHz). Status of the AM signal is given too. At the push of a button RF level in dBuv, frequency offset/bandwidth in kHz and carrier modulation in percentage is displayed.

It’s 12 push buttons appear to be physically mounted on one inside panel. All these buttons slightly wiggle when any one is pushed as if they were “loose.” This may be by design, however to ensure they will never stick. They have good tactile feel so I do not believe there is any reason for concern.

I had one issue with the radio. The display froze once on the station it was receiving (in this case, “Galeni TX1”) and I could no longer change frequencies or recall memories on DRM. This was easily fixed using the radio’s “Reset” command but at the sacrifice of losing all presets and memories.

Would I buy one? Yes, I would. The radio has good aesthetics would look fine anywhere in the house and it sounds great. Thanks to Fibber for loaning me the radio to try out.

ZYG:

The radio doesn't have an attenuator but I did try the BW settings. As I have not seen the schematic or even a block diagram of the receiver the following is only speculation on my part.

The radio needs a wide band IF filter to allow for the 10 kHz DRM signal. This IF filter appears to have a fixed (non-adjustable) bandwidth, and the adjustable menu BW filter appears to affect only the audio, as the adjacent strong station splatter can still be heard at the narrowest BW setting.

 A good test for a MW receiver during the day, here in the metro Atlanta area, is to tune to 50 kW station WSM 650 kHz in Nashville, Tennessee, 308 km away from my house. With an outside long wire antenna the station can be heard by a good receiver, even though there is an adjacent local 50 KW station WGST on 640 kHz (31 km away). The radio in my wife's car (Subaru, Forrester) can clearly pick up WSM, without splatter during the day, in our driveway with just the stock car antenna! Similarly, during the night hours with a good receiver I can receive 50 KW station CFZM 740 kHz near Toronto, Ontario, Canada, without adjacent channel splatter even though the adjacent channel of 750 kHz is occupied by local 50 KW station WSB (25.5 km away).

The Gospell can hear WSM with the long wire but unfortunately underneath the very strong splatter of WSB. The same occurs with CFZM. As for shortwave, I compared the GR-216 using its internal telescoping whip antenna side-by-side with my Tecsun PL-880 using its telescoping whip. I find the Tecsun to be a little more sensitive than the Gospell.

Thursday, May 10, 2018

Kim and SWRadiogram at NASB 2018!

Received Today from Dr. Kim Andrew Elliott. I will be hanging out with him and the NASB crew this next week. He's got special treats planned - see below!


Hello friends,


This email will provide information on the broadcasts for the next two weekends (47 and 48)

A special broadcast of Program 48 will be a demonstration of Shortwave Radiogram for the meeting of the National Association of Shortwave Broadcasters (NASB), this year hosted by SonSet Solutions in Elkhart, Indiana. Reception of Shortwave Radiogram will be on a SonSet radio, an inexpensive receiver designed for use in developing countries. Using an antenna on the roof of the steel warehouse building, replete with electronic equipment in operation, the signal will somehow be fed to the SonSet radio, and the modes will be decoded from what is received. What could possibly go wrong?

If for some reason an adequate signal does not reach the SonSet radio, Plan B will be to use audio on an mp3 recorded from program 47, using an SDR somewhere. For this reason, programs 47 and 48 have similar formats, but the content is different. Both shows will include slow modes, suitable for poor reception, such as on low-cost radios inside a steel building. And there will be some text in non-Latin alphabets.

For logistics reasons, the first transmission of program 48 will be moved up to 0800 UTC on 14 May.  To compensate for program 47 being bumped from the 0800 slot, program 47 will be broadcast at 0800 on  21 May. See this schedule chart ...



Program
No.
Day
May
date
UTC time
Frequency
kHz
Transmitter
47
Friday
11
2030-2100
7780
9455
WRMI Florida
47
Saturday
12
1600-1630
9400
Space Line Bulgaria
47
Sunday
13
2330-2400
7780
WRMI Florida
48
Monday
14
0800-0830
5850
7730
WRMI Florida
48
Wednesday
16
2100-2130
9395*
WRMI Florida
48
Thursday
17
2030-2100
9395*
WRMI Florida
48
Friday
18
2030-2100
7780
9455
WRMI Florida
48
Saturday
19
1600-1630
9400
Space Line Bulgaria
48
Sunday
20
2330-2400
7780
WRMI Florida
47
Monday
21
0800-0830
5850
7730
WRMI Florida
 
*Special for the National Association of Shortwave Broadcasters meeting in Elkhart, Indiana, 17 May at 2030 UTC. The transmission on 16 May at 2100 UTC is to test the receiving and decoding equipment and software. Listeners everywhere are invited to tune in to one or both of these transmissions.

Here is the lineup for Shortwave Radiogram, program 47, 11-13 and 21 May 2018, in modes as noted:

 1:34  MFSK32: Program preview
 3:09  Olivia 64-2000: Supervolcanoes have advance warnings
 7:10  Olivia 32-2000**: Continued
10:15  MFSK16: Text samples of Russian, Chinese, and Persian***
17:03  MFSK32: Australia invests in space agency*
21:30  MFSK64: President Macron visits New Caledonia*
26:23  Image: Railroad on 10th Street in New York City, 1910*
27:56  MFSK32: Closing announcements



Here is the lineup for Shortwave Radiogram, program 48, 14-20 May 2018, in modes as noted:

 1:33  MFSK32: Program preview
 3:11  Olivia 64-2000: Mercury has thin but dense crust
 6:49  Olivia 32-2000**: Continued
 9:37  MFSK16: Text samples of Russian, Chinese, and Persian***
16:42  MFSK32: New solar still purified water*
20:29  MFSK64: South Georgia declared rodent-free*
25:13  Greetings to the NASB meeting*
27:43  MFSK32: Closing announcements

* with image

** Use Olivia Custom setting: 32 tones, 2000 Hz bandwidth

*** Use UTF-8 character set (default in TIVAR and newer versions
of Fldigi)

Please send reception reports to radiogram@verizon.net

And visit http://swradiogram.net

Twitter: @SWRadiogram or https://twitter.com/swradiogram (check frequently during weekends)

Tuesday, April 24, 2018

Audio quality does matter. DRM delivers!

Interesting research here from USC.
"Audio quality influences whether you believe what you hear." DRM fans already knew that!


Friday, April 20, 2018

New DRM broadcast schedule

Click here for the new international schedule of DRM broadcasts. The file includes MW and SW. You'll notice a few new (or at least returning) broadcasters. Sadly, nothing to North America...again.

Tuesday, April 10, 2018

NASB 2018 in Elkhart Indiana!


Countdown to fun with your favorite shortwave broadcasters! Your admin will be there prepared to present. See below for the details. This is always a fun meeting. If you are near the Chicago area (South Bend, Indiana area really) c'mon and attend!

NASB 2018 Annual Meeting  
Thursday, May 17-Friday, May 18, 2018

Meeting Location: SonSet Solutions, 2830 17th Street, Elkhart, Indiana 46517-4008

Costs for Attendees:  There is no cost to attend the meeting itself, and the meals indicated in the agenda will be provided free of charge.  Attendees must pay their own travel and accommodation expenses.

MEETING AGENDA (updated April 9, 2018 - some items are still tentative):
Thursday, May 17

9:00 am - Meet in front of hotel for transport to Conference

9:30-10:30 am - Presentation about SonSet Solutions by Charles Jacobson and David Russell, Ministry President

10:30-11:00 am - Coffee Break

11:00 am-12:00 pm - Plant Tour of SonSet Solutions

12:00-1:00 pm - Lunch will be catered at SonSet Solutions

1:00-2:00 pm - Information about the new Gospell GR-216 DRM receiver and a 2018 worldwide recap of DRM news, presented by Christopher Rumbaugh of the DRM North America Group.  (my little bit!)

2:00-2:30 pm - Adventist World Radio Update by Dr. Dowell Chow, former AWR President

2:30-3:00 pm - International Broadcasting Bureau Shortwave Projects, by Gerhard Straub, Director, IBB Broadcast Technologies Division (tentative)

3:00-3:30 pm - Coffee Break

3:30-4:00 pm - 360-degree Rotatable Antenna Systems - presentation by Jerome Hirigoyen of Telediffusion de France

4:00-5:00 pm - Digital Broadcasts on Analogue Shortwave Transmitters - presentation by Dr. Kim Andrew Elliott, producer of "Shortwave Radiogram" (recently retired from VOA), including the live decoding of a Radiogram broadcast.

5:00 pm - Return to the hotel

6:00 pm - Leave hotel in carpool for Das Dutchman Essenhaus

6:30 pm - Group dinner at Das Dutchman Essenhaus in Middlebury, IN -- a typical Amish restaurant in the middle of Amish country

9:00 pm - Approximate time of return to the hotel

Friday, May 18

9:00 am - Meet in front of hotel for transport to Conference.

9:30 am - George Ross of Trans World Radio with more news about DRM including the Titus II receiver

10:00-10:30 am - The Far East Broadcasting Company - update from Bob Springer, who worked with FEBC on Saipan for many years

10:30-11:00 am - The Potential of Shortwave Radio - presentation by John from VOTW Radio International

11:00 am - Updates from other NASB member stations and associate members:  WWCR, KVOH, WEWN, WRMI, KNLS and more.

12:00 pm - Catered lunch at SonSet Solutions

1:00 pm - NASB Business Meeting -- Finance reports, elections, selection of next annual meeting site, other business

3:00-3:30 pm - Brief meeting of new Board members and officers