Re: Question to Glenn VK3PE
Hi Robert, yes I enquired? with him recently and he said he is not shipping at the moment because of the very long postal delays.? I take it from this he still has plenty of them to sell at some stage. As far as I recall, those B3555 parts are what Erik used originally.
No doubt a substitute might be found, but keep in mind the package size and pin-out before buying. Compare data sheets and connections carefully. Matching components on my pcb might have to be altered also. Shipping might still be an issue anyway.? I actually have some other SAW filters here in my junque box but smaller in size etc.
The B3550 seems like a possibility, BW a little narrower and matching would need slight changes. Erik would have a better idea on this.
The real problem might be availability.
Glenn
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Re: Question to Glenn VK3PE
Hi Glenn,
hfo_poland is an active userid on eBay but he is not currently selling those filters and the item number is not found.
These filters all are in the QCC8C package so no worries there.? Getting the 3555 is a problem though.? But, in my estimation, the other part numbers all seem to be close, perhaps they are all the same physical part and are just screened for slightly different spec's?
Based on availability, I think people are going to have to use the 3550 or one of the other variants which is available/obtainable, the question is whether or not these other part numbers are going to cause operational problems with the design.
73,
Robert, WA2T
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Re: Question to Glenn VK3PE
Sorry gents, upper level? address for my tinySA web page is
The EPCOS SAW filter is B3555.?? Now corrected on web page and BOM.??? My PCB can only take this particular filter package, QCC8C.
NOTE also that this device has input on a central pin on side but the output pin is not in the center.?
An ebay vendor for this part is listed at the bottom of the web page.
Glenn vk3pe
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Re: Question to Glenn VK3PE
On Wed, Jul 8, 2020 at 12:26 PM, Robert Entwistle wrote:
(although the 3740 is 433.92 MHz Fc)
Correction, the 3740 is 433.96 MHz Fc.
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Re: Question to Glenn VK3PE
On Wed, Jul 8, 2020 at 12:01 PM, Robert Entwistle wrote:
Also, is the 3550 version of the SAW the right one?? I have seen more than one (similar) part number for the filters.? Different BW's, slightly different Fc, etc.
To be clear, the (previous) BOM says 3550 SAW, the text of the Glenn's webpage says 3555 and Marty mentioned to me in an email he bought 3740 versions of the SAW.? I saw Erik mentioned the filters should ideally be 1 MHz wide.? They all look pretty similar (although the 3740 is 433.92 MHz Fc).? Any read on what is best to get, or it doesn't matter too much, etc.? 73, Robert, WA2T
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Re: Question to Glenn VK3PE
On Wed, Jul 8, 2020 at 01:45 AM, Glenn wrote:
If you refer to my web page, which is now updated with the BOM and Sch as of 8th July, you will see whats required and how I did it.
Hi Glenn, I'm getting this error:
Not Found
The requested URL /tinySA/BOM/BOM_tinySA_at-July-8th_2020.xls was not found on this server.
Also, is the 3550 version of the SAW the right one?? I have seen more than one (similar) part number for the filters.? Different BW's, slightly different Fc, etc.
Thanks and 73,
Robert, WA2T
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Re: Question to Glenn VK3PE
BOM link still busted¡ ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: Like us on Facebook! ? Moderator ¨C North American QRO Group at Groups.IO. ? email:? bill@... ? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Glenn
Sent: Wednesday, July 8, 2020 12:45 AM
To: [email protected]
Subject: Re: [HBTE] Question to Glenn VK3PE ? Hi Elia,
I hope your other project PCB's have been useful.
I have just re-done the Schematics after receiving,finally, my Attenuator module, so can test the tinySA more fully. What i found with the Pull-up resitors on the PE4302 module is that the PCF8574 can only drive the PE4302 inputs to about 1volt. Clearly too low.? With the nominated 4k7 resistors, and the 12k still fitted on the PE4302 module, the logic rises to ~2.5v. Min logic level for the PE4302 is 0.7 * Vdd = 2.31V.
The short answer is, they are required. ie the various pull-up resistors in the Schematic and BOM which I have now updated also. (Except for R25,26,27)
If you refer to my web page, which is now updated with the BOM and Sch as of 8th July, you will see whats required and how I did it.
As an aside, the PE4302 module I received is actually faulty!? It does not give the correct atten values on the V2 and V4 inputs ! Way off actually. I have another one coming, and will test that also, when it arrives.
Glenn
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Re: Question to Glenn VK3PE
Sorry, the links are OK now.
glenn
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Re: Question to Glenn VK3PE
Hi Glen,
Thanks for the reply, had a look at the update on your website and it is clear what to do, thanks.
By the way, the link to the new schematics seems to be broken.
Yes the PCB's were put to a good use, very pleased with them ?
73 Elia, M0ZHN
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Re: Question to Glenn VK3PE
Hi Elia,
I hope your other project PCB's have been useful.
I have just re-done the Schematics after receiving,finally, my Attenuator module, so can test the tinySA more fully. What i found with the Pull-up resitors on the PE4302 module is that the PCF8574 can only drive the PE4302 inputs to about 1volt. Clearly too low.? With the nominated 4k7 resistors, and the 12k still fitted on the PE4302 module, the logic rises to ~2.5v. Min logic level for the PE4302 is 0.7 * Vdd = 2.31V.
The short answer is, they are required. ie the various pull-up resistors in the Schematic and BOM which I have now updated also. (Except for R25,26,27)
If you refer to my web page, which is now updated with the BOM and Sch as of 8th July, you will see whats required and how I did it.
As an aside, the PE4302 module I received is actually faulty!? It does not give the correct atten values on the V2 and V4 inputs ! Way off actually. I have another one coming, and will test that also, when it arrives.
Glenn
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Re: Version 2.8 of the WA2FZW/M0WID software for the ESP32/ILI9341 hardware is available
P.S.? One set of the V1 boards I had made left.
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Hi Glenn,
I managed to get a V1 of your PCB's (thanks to the generosity of a fellow ham) and was wondering about a couple of things.The parts which are on the V2 but not V1, I can add them to the V1 board but are they required? (by the way, the differences on the V2 RF schematics on your website are not evident, the grey highlight is only on the Control board schematic)
The other question I have, some of the resitors on the V2 schematics are shown as optional, how essential are they for the operation of the unit?
By the way, I have your PCB's for the PicATune, modular STAR and combo star :D
73, Elia
M0ZHN
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Re: Version 2.8 of the WA2FZW/M0WID software for the ESP32/ILI9341 hardware is available
On Tue, Jul 7, 2020 at 12:39 AM, Glenn wrote:
Robert,
I thought? of just fitting the PE4302 chip but it might be a bit of a challenge for some, to fit it. Especially the pad under the chip. Safer, easier and maybe even cheaper to buy the module.
Glenn
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Hi Glenn (and John), Understand.? I have a lot of experience with QFN's but they can be very challenging for some to install.? You are exactly correct about the module vs. part cost, the modules are similar to cheaper!? I'm sure you know that both the PE4302's and SI4432's are obsolete/not for new designs, so there may be a supply problem in the future.? For the PE4302, Peregrine is recommending PE4312 and there are a few other parts in the SI4432 family, not sure of their status. I admit that upon first looking at the PCB's I thought "why not put the module parts on the board?" but the more I read/understand I see the value of having the modules.? Some "future-proofing" might be a good endeavor going forward though. I bought the filter chips (expensive!) too, even knowing that they have no place on the V1 boards.? Guess I am "future-proofing" my parts stores a bit! Thank you for allowing me to join the group, BTW. 73, Robert, WA2T
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Re: Version 2.8 of the WA2FZW/M0WID software for the ESP32/ILI9341 hardware is available
Hi Dave
Yes it's possible to mod the PE4302 modules for serial but would need some very fine copper cutting etc to isolate the serial pins..? For most if not all that's more difficult than just soldering the bare chip on.? In my working life I have done all those things so I'm used to it, but better to design i think for the simplest solution in this case.
Glenn
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Re: Version 2.8 of the WA2FZW/M0WID software for the ESP32/ILI9341 hardware is available
I am running version 2.2.6 here - no problems so far, but note I am using a normal ESP32 Dev board, not the WROVER used by Glenn's PCB.? No idea if that makes a difference (WROVER has PSRAM which the ESP32 library may try to use).
Dave
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Re: Version 2.8 of the WA2FZW/M0WID software for the ESP32/ILI9341 hardware is available
In my homebrew version I just bought some PE4302 chips and soldered them on, so I use the PE4302 in serial mode and don't bother with the IO expander.? Saves a huge amount of board space (and some cost) but layout becomes important as you have 40MHz SPI signals close to the signal you are trying to measure.? I had to fit series resistors to the SPI lines to eliminate the problem. If I ever do another board I would improve my layout as well.
You can modify most of the parallel PE4302 modules for serial operation if you don't want the IO expander.
It was indeed a challenge to solder, but achievable if you have hot air.? I think it could be too tricky with just a soldering iron.? The hot air also helps with soldering the SAW filters.
Dave
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Re: Version 2.8 of the WA2FZW/M0WID software for the ESP32/ILI9341 hardware is available
?Robert,
I thought? of just fitting the PE4302 chip but it might be a bit of a challenge for some, to fit it. Especially the pad under the chip. Safer, easier and maybe even cheaper to buy the module.
Glenn
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On Tue, Jul 7, 2020 at 01:36 AM, Robert Entwistle wrote:
Hi Glenn,
Will the V2 PCB still use the PE4302 attenuator module?? I got the impression that perhaps the attenuator used has changed but I only find the PE4302 mentioned on your webpage.
Thanks and 73,
Robert, WA2T
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Re: Version 2.8 of the WA2FZW/M0WID software for the ESP32/ILI9341 hardware is available
There's a couple of versions of the library between 2.2.0 and 2.2.6, but we haven't tried any of them, so for now, you should stick with 2.2.0.
--
John P.
WA2FZW
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Re: Version 2.8 of the WA2FZW/M0WID software for the ESP32/ILI9341 hardware is available
Hi John,
then should TFT_eSPI be downgraded to avoid crash?
Thanks for the reply.
-
Gyula HA3HZ
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Re: Version 2.8 of the WA2FZW/M0WID software for the ESP32/ILI9341 hardware is available
IMPORTANT!!!
In the process of testing the next version of the software, Jim (G3ZQC) ran into a problem that was causing the code to crash, while it was working fine on my unit. Turns out Jim had installed the latest version of the TFT_eSPI library (2.2.6) while I still had version 2.2.0. The newer version of the library turned out to be the culprit.
--
John P.
WA2FZW
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K9HZ
John P
Gyula Molnar