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TOPIC: 2 Metres on EESDRv3

2 Metres on EESDRv3 06 Nov 2021 18:05 #1

  • Tom_G0JSV
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One of the best features of the SunPro2 for me is the addition of the 2M band on a mainly HF rig. The new (now fully functioning memory channel storage on the very latest version of ESDR3) makes using 2M a joy. I might be using HF for most of the day but can then call up a simplex or repeater 2M memory channel for a local rag-chew.

The 2M receiver on my SunPro2 is amazing and betters many dedicated radios that I have in the shack. I have heard that the SunProDX is even better on 2M so will start saving for one of these.

The latest version of the ANC filter with the new ABC options is now able to pull out the audio on the very weakest 2M FM signals. These weak signals have previously been visible on the spectrum but inaudible.

I hope that EE continue the work with the new ANC filters.

Also, do EE have any plans to manufacture a dedicated VHF/UHF(SHF) radio? Can I be first on the list to buy one?


Tom
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2 Metres on EESDRv3 06 Nov 2021 18:24 #2

  • M0CVX
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Tom,
I think that the SunSDR2DX is underestimated on 2m...probably because it only has 8w output. However, it is more than enough to drive a legal limit SSPA. To put things in to context, my SunSDR2DX and Version 3 software is my No1 choice for 2m EME... ;-)

Paul M0CVX
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2 Metres on EESDRv3 06 Nov 2021 19:06 #3

  • Tom_G0JSV
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Nice one.

I hadn't even thought about people using the Sun radios for EME. So High power justified.

Even more reason for a EE branded VHF/UHF radio.

P.S. I am one of those QRP oddities so when confronted with a whole 8 watts I hardly know what to do with all that extra power. ;-)

Tom.
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2 Metres on EESDRv3 07 Nov 2021 08:22 #4

  • M0CVX
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Well Tom, I have an IC-9700 too but the SunSDR2DX has a number of advantages: TCI connection to data mode decoders is just so elegant, I can dial in a gain correction for my masthead preamp (so noise floor and signals read correctly), and the waterfall is sensitive enough that I can see some EME signals away from the frequency I'm using. It really is very good on 2m :-)

Paul M0CVX
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2 Metres on EESDRv3 28 Nov 2021 12:10 #5

Hi Friend's.

i want to tell you my reviews of 2m operation with the SunSDR2pro.
Bought a used SunSDR about one year ago.
Now only running the trncv. on 2m and i am happy with this.
After several EME-contacts i can say, that you have to use a good LNA with integreted BP for 2m. I had problems with signals from FM-broadcast stations and also mixing products from SW (Radio China) - now the band is clean.
Switching LPF,BPF VHF-LNA doesn't result in better spectrum, only bad sensitivity. If you switch off the NR, the spectrum seems much cleaner, when strong stations are on air (less phase noise- pulsing);
The TX-noise is very low, when you don't overdrive the final. Never had problems in contests.
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2 Metres on EESDRv3 29 Nov 2021 08:48 #6

  • M0CVX
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Just thought I would add that the SunSDR2DX has two key improvements for 2m over the Pro version: a HPF at 100MHz which is in circuit all the time, and a new internal LNA using a PGA103 device. For me, and anyone else buying a Sun radio to use on 2m, the SunSDR2DX is a better performer. I just thought I'd add that for anyone yet to make their mind up.
Version 3 software allows me to compensate for my masthead LNA's additional gain, and being reference locked to 10MHz means I am bang on frequency. My IC-9700 is 'resting' and my SunSDR2DX is the main radio on 2m now....
Paul M0CVX
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2 Metres on EESDRv3 29 Nov 2021 16:13 #7

Hello Paul,

yes i see the different between PRO and DX version.
But HPF100MHz means, that 100 MHz has only 3db ATT, i hope i'am right.. or 6db?
If u have strong FM-Broadcasts in your next area, the effect of the HPF is marginal and the LNA enters saturation.
I think, i have this problem, and hear one station-IM between 144.280-144.320 - very cool...
Why EE doesn't put the BPF before the LNA??
My masthead-LNA:
I had to adjust the internal BP - now i can see a nice hump on the Bandscope between 142 - 147 MHZ;
Reduced the gain. When the masthead-LNA is switched on, the noise-floor gets only 3db louder.
So the system works perfect, and i have no problems in contests, when many strong stations are on Air.

Maybe, if the BPF would be before the LNA, you wouldn`t need a masthead-LNA (only good cables!);

73 de Harry
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2 Metres on EESDRv3 29 Nov 2021 17:38 #8

  • M0CVX
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Well it sounds like you've done a great job of optimising your 2m station, Harry!
I've just had to drop my mast for the second time because of a flaky masthead LNA...New one hopefully here in the next day or so. This time I have gone for a SSB Electronics MHP-200R. Hopefully QRV via the moon again very soon. Not in the shack now, so not sure if we've had an EME QSO...but it would be my pleasure!
Best regards
Paul M0CVX
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2 Metres on EESDRv3 29 Nov 2021 18:45 #9

I am also using a masthead-LNA by SSB-Electronic- 20years old SP-2000 with sequencer.
Therefore, i think, i had to adjust the internal BP;
But if u will start your new one, check it and look for the hump in the bandsope;
You don't need the full gain - a little bit more is enough! The Sun is very sensitive!!

Yes, hope to meet u by the moon, or MS!!
Running not a very big station:
2x10el homemade-Yagis no elevation yet , 800W (should be 1kW, but Sun only TX 7Watts);
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2 Metres on EESDRv3 29 Nov 2021 19:03 #10

@ Tom

Please, don't be angry with me :hi: !
But:
Do not waste your SunSDR for FM on 2m!!
Hope to meet u on 2m via MS, FT8 or EME!!
73 de Harry
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