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TOPIC: SunSDR2 DX vs. Pro - Receive

SunSDR2 DX vs. Pro - Receive 06 Feb 2021 03:59 #1

  • txSDR9er
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I'm trying to decide if I want to buy SunSDR2 Pro or DX. Are there other enhancements in receive performance on the DX Or is it just the 100 watt PA? Thanks
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SunSDR2 DX vs. Pro - Receive 06 Feb 2021 07:55 #2

  • M0CVX
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Well, if you look on the Sunsdr2 DX page of this website you'll see 8 bullet points that describe the differences over the Pro model. Three of those bullet points relate directly to receive performance; though in my view it is the 2m receive performance which is the main benefactor (bettr LNA, and HPF to prevent strong HF stations bleeding across to VHF).
There is quite a lot of info on the website.
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SunSDR2 DX vs. Pro - Receive 08 Feb 2021 03:54 #3

  • txSDR9er
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Thanks for pointing me to the obvious, the website.
I've actually looked at the posted specs of both, and to me - they look almost identical in spec for HF (which is my interest)
sunsdr.eu/product/sunsdr2-pro/
sunsdr.eu/product/sunsdr2dx/

This appears to be an improvement or addition to the DX:
New high-performance built-in stereo audio codec 24 bit with 114 dB dynamic range

But compared to what on the Pro?

Pro specs list RDMR # (110db) but can't find same # for DX ... is it this 114db above?
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SunSDR2 DX vs. Pro - Receive 08 Feb 2021 08:03 #4

  • g0cgl
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'Almost identical' could be subjective. You may rightly think that. There are differences, but of course it is whether they matter to you.

SunSDR2 DX Improvements
100 watt transmit power on HF, 50 watt on 50 MHz!
New ATU connector for future antenna tuner option
External Fan connector
External fan included
HPF for VHF (100 MHz) to eliminate strong out-of-band stations coming from HF
LPF for HF (70 MHz) to eliminate strong out-of-band stations coming from VHF
Improved VHF LNA (PGA103+ chip)
New high-performance built-in stereo audio codec 24 bit with 114 dB dynamic range
Anderson Powerpole power connector
Ground connector added
Sturdy DIP-type ExtCtrl connector
Improved PCB topology
Lower power consumption and improved power dissipation
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SunSDR2 DX vs. Pro - Receive 08 Feb 2021 08:09 #5

  • M0CVX
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The dynamic range of the audio codec is more of an audio processing spec, and is not the same as RMDR.
The DX model has a low pass filter which will help at HF if you have strong VHF signals nearby. Otherwise, the Pro model looks to perform very similar to the DX model on HF Rx.
In my view regardless of RX performance, the better heat management of the DX is a useful thing to have, especially if you are in to data modes.
Paul M0CVX
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SunSDR2 DX vs. Pro - Receive 08 Feb 2021 08:29 #6

  • Rome
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Starting from the 3rd batch (manufactured in the 2nd half of 2020) I'd add to the list a new transformer in the TX path, which gives you TX IMD3 up to ~37 dB across all HF bands, with 100W output power and 80W on 6M.
We used the same transformer in the new MB1 Prime model.
Роман, Roman
Expert Electronics
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SunSDR2 DX vs. Pro - Receive 08 Feb 2021 08:36 #7

  • M0CVX
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Hi Roman!
I'm presuming mine has the new Tx transformer then (my DX is the January 2021 batch). Great news. I've had no RFI problems so far either, so I'm presuming some of the recently posted (decoupling capacitors) don't apply either.
Best regards Roman
Paul M0CVX
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SunSDR2 DX vs. Pro - Receive 08 Feb 2021 08:38 #8

  • Rome
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Hi, Paul.
Yes, both points are correct.
Роман, Roman
Expert Electronics
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SunSDR2 DX vs. Pro - Receive 08 Feb 2021 19:49 #9

  • e72x
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Roman,
Is it possible to upgrade for the 1st batch with new transformer?
Last Edit: 08 Feb 2021 19:51 by e72x.
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SunSDR2 DX vs. Pro - Receive 09 Feb 2021 09:23 #10

  • Rome
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Yes, we could replace the transformer for the devices from the 1st and 2nd batches, the cost is 140 USD + delivery charge.
The device should be sent to Russia, but we'll be able to work on it approximately in April/May, not earlier.
Роман, Roman
Expert Electronics
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SunSDR2 DX vs. Pro - Receive 09 Feb 2021 10:36 #11

  • EI9HEB
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Greate news count me in !
How do you VooDoo?
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SunSDR2 DX vs. Pro - Receive 09 Feb 2021 11:09 #12

  • e72x
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Awesome, Count me in !
tnx,
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SunSDR2 DX vs. Pro - Receive 05 Nov 2021 00:57 #13

  • VK4SX
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Hi Rome do you have Serial Number of New Transformer addition to models etc,? my SUN2DX delivered from M&L July 2020

Regards
Dennis vk4sx
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