Date   

Re: Support for R-666 Dragonfly SDR - Update

Tom Crosbie G6PZZ
 

For something built in the EU or NA, we expect better engineering but from China? They work to a different rule, usually “let’s copy a design then remove every component we can, so the product “just” works. As long as we keep buying this stuff, they’ll keep making it. We can only hope the manufacturer takes note of the feedback and comes up with a V2.0 eventually.

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of DXer
Sent: 29 August 2020 14:30
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Support for R-666 Dragonfly SDR - Update

 

On Sat, Aug 29, 2020 at 06:21 AM, Tom Crosbie G6PZZ wrote:

With a little bit of thought, aluminium and a fan, it is possible to increase the cooling substantially. Even larger ready-made heatsinks are worth adding.

Very true, but I would prefer not to have to 'mod' a brand new device, and if the 'mod' is a must, something is wrong then.

73 de Vince


Re: Memory channel highlighted

Francesco Di Giovanni
 

Yes,but if you move the pointer the default color returns.
I have requested the colour of the selected memory button stays steady.
This way, if you move it on the screeen you knos always which channel is selected.

73
Francesco IN3XZP


Re: Support for R-666 Dragonfly SDR - Update

Simon Brown
 

Yes,

 

Something else. I know of future developments 😊 . 2020 / 2021 / 2022 will be fantastic years for low-cost ground-breaking SDR hardware.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of DXer
Sent: 29 August 2020 15:07
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Support for R-666 Dragonfly SDR - Update

 

On Sat, Aug 29, 2020 at 09:51 AM, Simon Brown wrote:

It’s not hot, it’s warm. Stocks are limited, probably no new stock will be made.

That's good to hear. As for stock being limited, always a problem for items of this kind and price, even though it appears to be an excellent value. We need more hobbyists.

The main 'benefit' of the RX666/888 is that it shows that it's possible to offer a very good SDR for a lot less than just a few years ago. If no RX666/888 in the near future, something else perhaps.

73 de Vince


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: Support for R-666 Dragonfly SDR - Update

Simon Brown
 

Vince,

 

It’s not hot, it’s warm. Stocks are limited, probably no new stock will be made.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of DXer
Sent: 29 August 2020 14:30
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Support for R-666 Dragonfly SDR - Update

 

On Sat, Aug 29, 2020 at 06:21 AM, Tom Crosbie G6PZZ wrote:

With a little bit of thought, aluminium and a fan, it is possible to increase the cooling substantially. Even larger ready-made heatsinks are worth adding.

Very true, but I would prefer not to have to 'mod' a brand new device, and if the 'mod' is a must, something is wrong then.

73 de Vince


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: Doppler Discontinuity at TCA (Time of Closest Approach)

Simon Brown
 

Ah,

 

Interesting. This will affect Doppler of course, I’m surprised at the result.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Hasan Schiers N0AN
Sent: 29 August 2020 14:10
To: SDR-Radio@groups.io
Subject: Re: [SDR-Radio] Doppler Discontinuity at TCA (Time of Closest Approach)

 

Problem Solved:

 

When setting up a new computer, I went to enter 350 meters for the altitude. It took it as 35,000 meters. This caused the doppler tracking to not only be off at AOS and LOS times,  it also caused the 200 Hz jump at TCA on every bird.

 

Once I got it set to 350, I again, had perfect doppler tracking.

 

73, N0AN

Hasan

 

 

On Fri, Aug 28, 2020 at 7:30 AM Hasan N0AN <hbasri.schiers6@...> wrote:

I use Mode B Satellites a lot. I am finding of late  that there is a consistent doppler discontinuity immediately after TCA (highest point of tracking and the point of 0 doppler).

 

It is about 150 Hz, a sudden shift, then it maintains that shift for the remainder of the passess.

 

It only happens on the uplink (70cm, where the doppler is much faster than the 2m downlink), and it happens on every satellite and every pass.

 

I hear it, the stations I'm working hear it and it is as predictable as clockwork.

 

I tried going back from .25 to .24, made no difference. Changed Keplers, no difference. 

 

Any ideas?

 

73, N0AN

 

BTW, KB7IJ experienced the exact same thing and he ended up completely uninstalling windows 10 and doing a clean install and it went away.

 

I'd like to not have to do that, if there is an easier solution.

Hasan


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: Doppler Discontinuity at TCA (Time of Closest Approach)

Hasan Schiers N0AN
 

Problem Solved:

When setting up a new computer, I went to enter 350 meters for the altitude. It took it as 35,000 meters. This caused the doppler tracking to not only be off at AOS and LOS times,  it also caused the 200 Hz jump at TCA on every bird.

Once I got it set to 350, I again, had perfect doppler tracking.

73, N0AN
Hasan


On Fri, Aug 28, 2020 at 7:30 AM Hasan N0AN <hbasri.schiers6@...> wrote:
I use Mode B Satellites a lot. I am finding of late  that there is a consistent doppler discontinuity immediately after TCA (highest point of tracking and the point of 0 doppler).

It is about 150 Hz, a sudden shift, then it maintains that shift for the remainder of the passess.

It only happens on the uplink (70cm, where the doppler is much faster than the 2m downlink), and it happens on every satellite and every pass.

I hear it, the stations I'm working hear it and it is as predictable as clockwork.

I tried going back from .25 to .24, made no difference. Changed Keplers, no difference. 

Any ideas?

73, N0AN

BTW, KB7IJ experienced the exact same thing and he ended up completely uninstalling windows 10 and doing a clean install and it went away.

I'd like to not have to do that, if there is an easier solution.
Hasan


Re: Off-Topic (kind of): LED light bulb.

Kriss Kliegle KA1GJU
 

If looking for shop lights and you are a cheap ham in the USA, Ocean State Job Lots has them. They are in a plastic housing (ugh), but are RF quiet. I have one over my soldering/work bench.

https://www.oceanstatejoblot.com/maxlite-4-led-shop-light-42-watt/product/213080

They have a single tube version, but I have yet to test it:
https://www.oceanstatejoblot.com/4-led-shop-light-40-watt/product/212087

YMMV  (Your Mileage May Vary)

73 Kriss KA1GJU


Re: DX Galaxy Down?

Simon Brown
 

Jim,

 

I’ve asked for the system to be restarted, may take 48 hours. I will move dxgalaxy to a Word{Press site once I get the RX-666 working.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Jim W7EED
Sent: 29 August 2020 02:07
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] DX Galaxy Down?

 

The DX Galaxy seems to be down again.  I can get to the home page but all other links returns a "Page Not Found (404)" error.
--
Regards,
Jim W7EED


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: Support for R-666 Dragonfly SDR - Update

Tom Crosbie G6PZZ
 

Vince,

With a little bit of thought, aluminium and a fan, it is possible to increase the cooling substantially. Even larger ready-made heatsinks are worth adding.

 

73 Tom G6PZZ

Nr Chesterfield | NE Derbyshire | UK | IO93he

HF250 | Sentinel 4 | RSPdx | RM50 | TR2 | ATS 808

15m MLB | MTA | D707

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of DXer
Sent: 28 August 2020 06:17
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Support for R-666 Dragonfly SDR - Update

 

On Thu, Aug 27, 2020 at 11:45 AM, Max wrote:

The RX888 looks to be the better deal.

I tend to agree, but the following still 'bothers' me:

"1. Heat generation problem, because the ADC chip LTC2208 generates a lot of heat at high sampling rates, even though it has been guided to the shell with a thermally conductive silicone pad, and the shell is also attached with a heat sink. But the shell will still be very hot after working for a long time, but after a long time running test, the stability is OK. Passive heat dissipation is limited by the size of the heat sink".

73 de Vince


Re: Off-Topic (kind of): LED light bulb.

Allan Isaacs
 

The life of the bulb is up to 25,000 hours so a life of 10 minutes would come within that time span?

Presumably the FCC rules for a residential installation are less severe than say an aircraft or a ship. Maybe we should buy equipment made to meet stricter rules and pay two dollars?

Allan G3PIY


From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of DXer
Sent: 28 August 2020 23:25
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] Off-Topic (kind of): LED light bulb.

 

I went to the dollar store today, and they had 100W equivalent LED light bulbs available for a $1.25. First time I saw 100W at this price at the dollar store.

The 'news' part is that this one has the FCC logo on the packaging, talks about part 15 and all that. See pictures:



73 de Vince


Re: Support for R-666 Dragonfly SDR - Update

Bob Dengler
 

At 8/27/2020 10:16 PM, you wrote:
On Thu, Aug 27, 2020 at 11:45 AM, Max wrote:
The RX888 looks to be the better deal.

I tend to agree, but the following still 'bothers' me:"1. Heat generation problem, because the ADC chip LTC2208 generates a lot of heat at high sampling rates, even though it has been guided to the shell with a thermally conductive silicone pad, and the shell is also attached with a heat sink. But the shell will still be very hot after working for a long time, but after a long time running test, the stability is OK. Passive heat dissipation is limited by the size of the heat sink".73 de Vince
Clearly a lot is being lost in translation :)

Bob NO6B


Re: DX Galaxy Down?

Jim W7EED
 

The DX Galaxy seems to be down again.  I can get to the home page but all other links returns a "Page Not Found (404)" error.
--
Regards,
Jim W7EED


Re: Support for R-666 Dragonfly SDR - Update

Franco Venturi
 

For those interested in these topics I just created a new group called 'Next Generation SDRs' to share the information about the BBRF103, RX-666, RX888, etc - https://groups.io/g/NextGenSDRs

I'd like to collect there what is known about these SDRs - technical details, performance, user experience, software, prices, improvements and 'hacks', etc

Everyone is welcome.

Franco - K4VZ


Re: Off-Topic (kind of): LED light bulb.

Dave (NK7Z)
 

As always, buy one, test, if you like, buy the rest from the same lot number...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 8/28/20 3:24 PM, DXer wrote:
[Edited Message Follows]
I went to the dollar store today, and they had 100W equivalent LED light bulbs available for a $1.25. First time I saw 100W at this price at the dollar store.
The 'news' part is that this one has the FCC logo on the packaging, talks about part 15 and all that. See pictures:
73 de Vince


Re: Off-Topic (kind of): LED light bulb.

Dave (NK7Z)
 

I bought one of these, tested it, a year or more ago, for $1.00 each, and found it to be clean... That does not mean all will be clean, but I bought 39 more, (don't want to mix LED lights), and have had great performance from them all.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 8/28/20 3:24 PM, DXer wrote:
[Edited Message Follows]
I went to the dollar store today, and they had 100W equivalent LED light bulbs available for a $1.25. First time I saw 100W at this price at the dollar store.
The 'news' part is that this one has the FCC logo on the packaging, talks about part 15 and all that. See pictures:
73 de Vince


Re: Memory channel highlighted

jdow
 

It already is highlighted. You've just not noticed it. The colors in the selected receiver's matrix window are brighter than the others.

{^_^}

On 20200828 08:35:29, Francesco Di Giovanni wrote:
Hi Simon, thank you for your work.
Could be possibile in a future release to have the selected memory channel highlighted?
Maybe the same color when you go over with the pointer will be enough.
This way one will always knows which channel is selected.

Thank you
73
Francesco Di Giovanni - IN3XZP


Re: Auto mute - SDR protection

jdow
 

For an ultra low noise station I'd trust it no farther than I could throw it will on a ventilator with COVID-19. Ultra low noise devices are a tad fragile. On the up side you would normally not meet those unless you are doing Moon bounce or something else equally exotic. For SDRs at VHF and up it probably will leak enough energy that an unprotected SDR input might be in danger. (Remember energy is power times time.) This will vary from SDR to SDR. A modern rtlsdr dongle would probably be OK. I believe AirSpy is protected.

For HF it's fine. You hook a 1 watt 10 dB pad between it and the receiver and party. The pad won't affect signal to noise ratio unless your antenna is really horribly inefficient. In that case wuffo you using it for TX?

{^_^}

On 20200827 23:31:56, John Elliott wrote:
Thanks for the reply. I have purchased the MFJ 1708B  unit and have set that up in line , but again , there are a lot of yutube videos of the unit and how to use it , but is it working ??. or just presume it works , until the $100 + SDR unit dies , indicated by the smoke 
--
John - VK3CVF


Re: Auto mute - SDR protection

Frank Eichel
 

John,

I have used the MFJ unit and a pin diode T/R switch but found that I could still hear the transmitted audio in my headphones, even with auto-mute set. Since the audio is delayed by software processing, it was out of step when I spoke, most annoying.

I solved my problem with the Elad switchbox which has an additional relay to switch out the headphones during transmit. This might not be ideal if you operate in Morse code, I don't use that mode.



73, Frank VE7AWV 




On Fri, Aug 28, 2020, 8:16 AM DXer <hfdxmonitor@...> wrote:
Ken,

I hear you. I have 4 MFJ products, and they work fine for the most part, but I consider them glorified homebrew devices.

Unless you are using a single antenna for both your TX and RX, the DX Enginnering and Cross-Country Wireless devices are better options IMHO. YMMV

73 de Vince


Memory channel highlighted

Francesco Di Giovanni
 

Hi Simon, thank you for your work.
Could be possibile in a future release to have the selected memory channel highlighted?
Maybe the same color when you go over with the pointer will be enough.
This way one will always knows which channel is selected.

Thank you
73
Francesco Di Giovanni - IN3XZP


Re: Auto mute - SDR protection

Ken Alexander
 

I have need for one, but if I was to order one I'd pay the service department at whatever shop I bought it from to open it up, check it out for bad solder joints and proper functioning before they ship it.

It saddens me that I would have to go to that kind of trouble and expense to insure I have a functional, reliable unit.  But, I live 12 time zones away from my remote station so it's necessary.

73

Ken
VE3HLS
So Phisai, Thailand
Blog:  bueng-ken.com


On Fri, Aug 28, 2020, 20:46 DXer <hfdxmonitor@...> wrote:
On Fri, Aug 28, 2020 at 02:31 AM, John Elliott wrote:
I have purchased the MFJ 1708B... , but is it working ??. or just presume it works , until the $100 + SDR unit dies , indicated by the smoke
Reviews are all over the place, so hard to say.

73 de Vince

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