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Re: PHSNA optimised for audio frequencies
Chuck Olson
Oscar -
I was just thinking that the AD9833 is surface mount and PICs are still available in DIP - so a PIC would be easier to build with - but I forgot about buying modules :) Best Regards, Chuck, WB9KZY |
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Re: PHSNA optimised for audio frequencies
owal0002@...
Hi Chuck,
Thanks for pointing that out, considering the low amplitudes and heavy filtering I'll be using, I think 10 bit should be OK. I think I'll stick to using the AD9833 since my programming skills are very limited (esp. with anything non-arduino), and I'd rather use a pre-built solution than implement the DDS myself. Unless there's some other factor I'm not considering? Cheers, Oscar |
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Re: PHSNA optimised for audio frequencies
Chuck Olson
Oscar -
The AD9833 has a 10 bit DAC. If a 10 bit DAC is OK I'd ditch the AD9833 and sub a microcontroller with a 10 bit DAC to generate the audio. 20 kHz would be a challenge but with a 20 MHz (or higher?) clock it might be done with something like a 14 pin PIC16F1764. You could have a second microcontroller to read the AD8307 and control the frequency and output to a display. Best Regards, Chuck, WB9KZY |
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Re: PHSNA optimised for audio frequencies
It seems like a good plan to me. I'd expect the synthesizer to work even
better due to many more samples per cycle. There's typically an output filter following the DDS chip that you might want to redesign to cut-off just above your range of interest. 73 Nick, WA5BDU On Sat, Mar 5, 2022 at 6:31 AM owal0002 via groups.io <owal0002= student.monash.edu@groups.io> wrote: Hi all, |
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PHSNA optimised for audio frequencies
owal0002@...
Hi all,
It seems this group is a bit quiet these days but would appreciate any advice. I'm a uni student looking to build a SNA optimised for audio frequencies (20Hz - 20kHz). It will be used to test audio equipment that I make. My plan is to use an AD9833 DDS chip module controlled by an Arduino, and the usual AD8307 setup to convert the output to dB. Aside from changing the filters and coupling capacitors to accommodate audio frequencies, are there any other considerations I should be aware of? Is it even possible to get clean/flat readings down to 20Hz? Would appreciate any advice. Cheers! Oscar |
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Re: SNA Latest version Info
Hi Jason,
Take a look at the nano VNA H4. For about 60$ you get a very decent VNA with TFT screen and nice PC software. You can never make ik yourself for that price. Be aware of the new European taks law when you buy from China ! 73 de ON7UF Roland -----Oorspronkelijk bericht----- Van: PHSNA@groups.io [mailto:PHSNA@groups.io] Namens 9H5BM Verzonden: maandag 19 juli 2021 18:25 Aan: PHSNA@groups.io Onderwerp: [PHSNA] SNA Latest version Info Hi, I am looking to build an Arduino-style SNA to test some bandpass and low pass filters I am building for a project. I seem to understand that they all lie around the ad8307, or op-amp detector together with the AD DDS MODULE. Can anyone point me to a stand-alone SNA with a TFT display - where I can find the info such as the gerbers and Firmware? hex files? 73's Jason |
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Re: SNA Latest version Info
9H5BM
Hi Rudi,
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Thanks for the pointers, is there a kit for the nano va ? i was opting to build yana-bt - 73's Jason On Mon, Jul 19, 2021 at 11:54 PM Rudi <reuterr@...> wrote:
On Mon, Jul 19, 2021 at 07:31 PM, 9H5BM wrote:Hello Jason, |
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Re: SNA Latest version Info
wb6ogd
Yes, even though I love my modified PHSNA,
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I wouldn’t bother to build one today when you can get a VNA for $50!! 73, Gary WB6OGD On Jul 19, 2021, at 2:54 PM, Rudi <reuterr@...> wrote: |
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Re: SNA Latest version Info
Rudi
On Mon, Jul 19, 2021 at 07:31 PM, 9H5BM wrote:
Hello Jason, How about the nanoVNA? https://groups.io/g/nanovna-users and https://www.rudiswiki.de/wiki9/nanoVNA 73, Rudi DL5FA |
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Re: SNA Latest version Info
9H5BM
Hi Nick,
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Thanks for your input, I have found that group and browsed the files already. looks like I end up building my own -- and code it with the available sources !! I might do a PCB for it too! so I keep looking! 73's Jason On Mon, Jul 19, 2021 at 7:44 PM Nick Kennedy <kennnick@...> wrote:
Well, when the PHSNA project was going strong I know that there were at |
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Re: SNA Latest version Info
Well, when the PHSNA project was going strong I know that there were at
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least a couple of folks working on stand-alone versions. You might look at this group’s ‘files’ and ‘photos’ sections to see what they were doing and who you might contact. One of those projects evolved into a commercial project. It may no longer be in production but you might get ideas from here: https://midnightdesignsolutions.com/sna/ 73 Nick, WA5BDU On Mon, Jul 19, 2021 at 12:31 PM 9H5BM <jmcservv@...> wrote:
Hi, |
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SNA Latest version Info
9H5BM
Hi,
I am looking to build an Arduino-style SNA to test some bandpass and low pass filters I am building for a project. I seem to understand that they all lie around the ad8307, or op-amp detector together with the AD DDS MODULE. Can anyone point me to a stand-alone SNA with a TFT display - where I can find the info such as the gerbers and Firmware? hex files? 73's Jason |
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Re: Looking for info to build a VNA
Dave VE3LHO
Leandro,
If you scroll to the bottom of the site Steve pointed to (https://nanorfe.com/nanovna-v2.html) you'll find the schmatics and board details for the nanoVNA V2. A fairly advnced project but probably the most capable "open" design out ther right now. The block diagram and basic details for the "original" nanoVNA were made public and I think perhaps the schematic too. I don't see the schematic around now and the orginator's site is also gone, I think.The block diagram does give basic info. Daniel KW4TI has a design based on the EU1KY antenna analyzer (which is all but a VNA) and the details are on github at https://github.com/profdc9/VNA This VNA is similar to the nano but uses a different bridge design. Erik Kaashoek (designer of the tinySA) has some info including schematic and code for a VNA that uses a PC and its audio inputs at https://github.com/erikkaashoek/Tapr-VNA The PC app is also there. And look the nanoVNA schematic as well :-) This VNA is based (I think) on one version of the TAPR VNA and is essentially the same basic design as the nano, RF wise. If you look at other repos of Erik's you will also find a fork of a F4GOH's VNArduino but since it uses an AD9851 it may be a harder build. Hope that gives you something to consider. 73s Dave VE3LHO |
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Re: Looking for info to build a VNA
Leandro Sorkin
Hello Ignacio EB4APL, Steve K1RF and Steve KM5HT and thanks for your replies.
Sorry for my mistake in calling VNA an SNA device. I know the difference between them. Before getting into this group been exploring my options and found that the nanoVNA is unavailable from all vendors. Even found a fellow from the UK that sells an N2PK VNA, with many bells and whistles, but for a completely out of reasonable price (600+ euros). Being used to build my own equipment and due to the reasons above, I started to look for building information like PCB diagrams, software, etc. Most likely will use some diagrams I've found and do my own development. Anyway, thank you all for the information. 73 Leandro VE3WT/LW5DM |
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Re: Looking for info to build a VNA
Steve Arntz, KM5HT
Here is everything you wanted to know about the NanoVNA. https://nanorfe.com/nanovna-v2.html
I do still love my PHSNA. 73 Steve, KM5HT |
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Re: Looking for info to build a VNA
Steven Dick, K1RF
Hi Leandro. . I had built a PHSNA and it was a fun project and I still
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use it, primarily for adjusting filters. In addition to Ignacio's comments, the DDS devices used in the PHSNA are becomming scarce on EBAY. You are MUCH better off purchasing a nano VNA. Yes you will miss all the fun building your own, but at the present time, you would run into a lot of difficulties and IMO it's just not worth the effort and you would spend more money for much less capability compared to the nanoVNA. SDR Kits also sold a high performane VNA called the DG8SAQ VNWA3. About $354 including VAT + shipping. -Steve K1RF ------ Original Message ------
From: "EB4APL" <eb4apl@...> To: PHSNA@groups.io Sent: 5/28/2021 12:27:16 PM Subject: Re: [PHSNA] Looking for info to build a VNA Hi, -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
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Re: Looking for info to build a VNA
EB4APL
Hi,
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First of all, the PHSNA is a Scalar Network Analyzer, not a VNA. For a VNA google for nanoVNA, it is portable and already built, but for around $50 I think that it is impossible to build one yourself. Second: The PHSNA group has all the info, schematics, theory, PCB layouts, software, everything that you would would need to build one. Unfortunately there are not PCBs for sale, they had been available several years ago, but now I think that all remaining ones were depleted. Regards, Ignacio EB4APL El 28/05/2021 a las 0:44, Leandro Sorkin escribió:
Hello everyone. --
El software de antivirus Avast ha analizado este correo electrónico en busca de virus. https://www.avast.com/antivirus |
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Looking for info to build a VNA
Leandro Sorkin
Hello everyone.
It seems this forum has been around for quite some time. I am a newcomer that wants to build his own VNA and been looking for information. Unfortunately, all the info seems to be "top secret" or just a few pieces released (mostly useless pictures of someone else's project) but nothing that I could use to build mine). Can someone point me into the right place for technical info, like schematic, pcb, software, etc. ? Even YL3AKB info seems to be "confidential" Thanks in advance for all help I can get. 73 de VE3MIZ, Simon |
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Re: Ver. 1.42 and crystal measurement
I don't know if interest in the measurement receiver ever "took off" so
there may not have been many boards. All the boards for the project were produced by N5IB, except for cases where folks decided to "roll their own". There has been renewed interest in the group as seen in more people joining the list, as well as a few dropping out in response to the increased traffic. ;^) However, I think most of them may just want to get access to some of the files and info residing in the files section of the groups.io site. Which is a good reason to sign up. The nanoVNA is an amazing device for sure and I'm still learning mine. I do find myself firing up the PHSNA occasionally, usually for crystal measurements. 73 Nick, WA5BDU On Tue, Jun 30, 2020 at 4:19 PM goldeaglemex strathman < goldeaglemex@...> wrote: Nick |
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Re: Ver. 1.42 and crystal measurement
goldeaglemex strathman
Nick
Re: Board availability. I think I have the sweep generator and power meter covered. I could use the boards for the measurement Rx though. Noticed today that I had ordered a bag of 3.2768 crystals some time ago. Probably to avoid calculating filters and the diplexer. So, I can use those for the Rx board. Also will have to make sure I can mesh my hardware with the existing software. Great learning experience so far. How was the response to your offer to re-visit the PHSNA? With such easy access to nanoVNA's, etc. doubt that you are deluged with interest. Shame. Great learning experience all around. 73's Ron K6DNV |
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