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Softrock EnsembleRXTX
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Hello everybody,
I have just tested the output power of my 15-12-10m Softrock EnsembleRXTX. It delivers 1w on 15 and 12m and 0.7w on 10m, which is fine for me. Interestingly on 17m is also delivers 1w and about 0.6w on 20m. Given the fact I can add any low pass filter for attenuate harmonics, may I safely use it on 20 and 17m (power output and sensitivity are fine to me) or is there any possible issue using on 20 and 17m? 73, Franco iz2oos |
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Hi Franco,
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Re. 17m and 20m, an external LPF will take care of harmonics, but the lack of adequate LPFiltering on the mixer output will lead to intermod products within band. There was a big discussion thread on this a few years ago. If you are running low power this is probably not an issue, but if you are running a power amp on the RXTX it could be a problem. 73, Roger On Aug 28, 2020, at 12:08 PM, Iz Oos via groups.io <iz2oos@...> wrote: |
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Hi Roger,
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thank you for the neat informative reply, that was what I needed to know. I will stay on 15-12 and 10m. 73 Franco iz2oos Il venerdì 28 agosto 2020, 21:20:26 CEST, Roger <ve7vv@...> ha scritto:
Hi Franco, Re. 17m and 20m, an external LPF will take care of harmonics, but the lack of adequate LPFiltering on the mixer output will lead to intermod products within band. There was a big discussion thread on this a few years ago. If you are running low power this is probably not an issue, but if you are running a power amp on the RXTX it could be a problem. 73, Roger On Aug 28, 2020, at 12:08 PM, Iz Oos via groups.io <iz2oos@...> wrote: |
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Hello Franco,
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If you want real power from your Softrock, have a look at my modification to convert the Softrock into the 'GM3SBC PowerRock". It is my modification to produce 10 Watts RMS from the same PCB. YES, . . . . . . . Just a few mods on the pcb and you have a total transformation !? Search for GM3SBC QRO Modification in the forum. I spent many hunderds of hours providing this design for hams. Regards Ed GM3SBC?? Please check out :- *scottie-sdr.co.uk* for even more power. On 8/28/2020 8:08 PM, Iz Oos via groups.io wrote:
Hello everybody, |
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Franco,
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Please see the attachment for the modification. When I presented this modification to the group there was a stunned silence ! Not one comment ! Regards Ed GM3SBC Senior Research Engineer. On 8/28/2020 10:06 PM, murphy edward via groups.io wrote:
Hello Franco, |
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I don't see this on your webpage ??
73, Zack W9SZ On Fri, Aug 28, 2020 at 4:06 PM murphy edward via groups.io <ed.gm3sbc= [email protected]> wrote: Hello Franco,<> Virus-free. www.avast.com <> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> |
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The mod is at
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/g/softrock40/files/GM3SBC QRO Modifications/QRO Modifications.doc </g/softrock40/files/GM3SBC%20QRO%20Modifications/QRO%20Modifications.doc> On Aug 28, 2020, at 2:42 PM, Zack Widup <w9sz.zack@...> wrote: |
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Ed,
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I've been away from softrock for a bit, but have a 20/15/20 board here and most of the parts. It was one of my issues on power. Would like a bit more than 1W. How do I find out more about your project? Let me know Ed, Douglas Douglas Felsenthal – Contingent Engineering | PE Entrepreneurial Business Development Planning Strategist email: douglasfelsenthal@... Cell: 612-817-7323 linkedIn.com/in/douglasfelsenthal Web: douglasfelsenthal.com WA0RSD (Radio Station Delta) -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of murphy edward via groups.io Sent: Friday, August 28, 2020 4:29 PM To: [email protected] Subject: Re: [softrock40] Softrock EnsembleRXTX Franco, Please see the attachment for the modification. When I presented this modification to the group there was a stunned silence ! Not one comment ! Regards Ed GM3SBC Senior Research Engineer. On 8/28/2020 10:06 PM, murphy edward via groups.io wrote: Hello Franco, |
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Hello Zack,
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Have a look in the *softrock40 groups io forum* in the Files section and search for " *GM3SBC QRO Modifications*" Regards Ed GM3SBC On 8/28/2020 10:42 PM, Zack Widup wrote:
I don't see this on your webpage ?? |
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Hello Douglas,
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Have a look in the *softrock40 groups io forum* in the Files section and search for " *GM3SBC QRO Modifications*" Regards Ed GM3SBC On 8/29/2020 12:10 AM, doug felsenthal -WA0ODQ wrote:
Ed, |
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N1GMM
Wow Ed, you have put A LOT of work into this document you reference. Interesting. Tony is sellin again ensemble kits and I have a couple. I just may build one of these. Your Scottie looks great too..
THANKS for putting it up here. I am surprised that there were few comments. You put a lot of work and documentation into this. Guy. N1GMM |
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Hi Ed,
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I see a the effort for a well documented mod. I will read and reread it. It is not too easy but looks feasible. Currently I am using a BV-131 I was given for free to increase the output to 20-25w, not that smart but works.10w input would mean 120w out of the BV-131, which is something. Franco iz2oos Il sabato 29 agosto 2020, 13:43:19 CEST, N1GMM <guy@...> ha scritto:
Wow Ed, you have put A LOT of work into this document you reference. Interesting.? Tony is sellin again ensemble kits and I have a couple. I just may build one of these.? Your Scottie looks great too.. THANKS for putting it up here. I am surprised that there were few comments. You put a lot of work and documentation into this. Guy. N1GMM |
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Hello Guy,
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Thanks for your comments. For sure it was a large undertaking in doing the in depth design study to produce all the details and ending with the final results to a producton standard. It was an interesting challenge for me, to provide a considerable increase in power output, with relatively simple modifications, but still within the same PCB and Enclosure. I have modified *all t*he Softrock versions that cover *160 Metres through to 10 Metres.* The *10 Metre unit *provides*7 Watts RMS *output. Still a mighty lot more than the usual 0.5 Watts on that band with a stock Softrock ! Inspired by *Tony's Softrock design*, and the success of my QRO Modifications, I then decided to embark on a completely new SDR design - This would be an *all band 1.8 MHz to 1296 MHz design* within a small enclosure which would produce RF Power in the region of *30 to 38 Watts PEP* on the *HF bands 1.8 to 70 MHz* and for the higher *144, 432, 1296 MHz* bands a power of *2 Watts **PEP*. The result was the *Scottie Globemaster SDR*. Since then I have introduced an *Ultra Stable Oscillator ( 0.016 ppm )* - known as the *Scottie Drift Zapper*. This unit fits within the Globemaster SDR. This unit provides extremely high performance especially on the Digital modes where frequency stability is paramount. Not satisfied with that, my colleague and I introduced the capability of using the incredible *Silicon Labs* *new Si549* oscillator**within the Globemaster SDR. This oscillator has a *super low jitter performance*. The results have been excellent, providing the capability of resolving very weak signals adjacent to high power stations.? To the best of our knowledge no other SDR in the world has this oscillator performance. Please have a look at my QRZ.com page to see the introduction of Tony's Softrock inspiration. For sure, without having had the pleasure of building his rigs we would have never embarked on our Scottie GLobemaster SDR Project, over 5000 man hours of effort to date.? We are still very active providing professional technical support to this project. I hope that a few take on the challenge of upgrading your Softrock. The modifications are easy, take each step in turn as described in the project document and you will be go to go ! Enjoy. Best Regards Ec GM3SBC - Senior Research Engineer. n 8/29/2020 12:43 PM, N1GMM wrote: Wow Ed, you have put A LOT of work into this document you reference. Interesting. Tony is sellin again ensemble kits and I have a couple. I just may build one of these. Your Scottie looks great too.. |
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N1GMM
Hello Ed. I am planning to make several changes to the softrock (including yours I think). I will join the globemaster io group to see whats going on there.
I think SDR transceivers are the way in the future. Create the front end and do all the processing at the computer.. change the software and you have a new radio.. I am still not used to sitting in front of a laptop with the waterfall and no knobs to tweek.. just cursors. Your design looks great.. I need to look in more detail. Best regards -Guy |
doug felsenthal -WA0ODQ
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