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Anyway, I have not yet managed to measure with dynamics greater than 60dB and the nanoVNA if it has it at frequencies below 300MHz, so I do not have a pressing need for this tracking generator to be very good either. It's mostly because of the "challenge."
Sorry if my English is a little "strange", but I am using google translate which is better than my head
- EA1AWY Javier Muriedas (Gij¨®n, Asturias, Espa?a)
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Thanks for the suggestion John. I use one of those SAW transmitter modules, but it is built to be CW modulated, meaning all or nothing. The modulation input drives the base of a transistor through a resistor that is in series with the ground connection of the emitter of the oscillator transistor. You could apply a potentiometer between the positive supply and ground and vary the conduction of the modulator transistor linearly. This would fundamentally vary the amplitude of the oscillation and perhaps the frequency somewhat, but you would have to be careful not to completely turn off the oscillator. I suppose there would be the possibility of using a module prepared for FM or adding a varicap to it somewhere in the current one, but with a 3V3 power supply it would not do much. It is much easier to measure the frequency of the module with a frequency meter and write it down and correct the value of the IF in the TinySA when it is going to wobulate. As the minimum RBW is 3kHz I do not consider necessary a GPS type precision. Also, I assume these SAWs are not very accurate, but they are stable. I mean if mine is offset by 22kHz, I trust it will stay at that value over time and not vary several kHz with the shack temperature either. This low power value is also a drawback when feeding the MAR-8A as it is specified for 3V6 and when feeding it with 3V3 I deduce that its gain and its maximum output level drop appreciably, as has the consumption (from 36mA to 14mA ). And thank God that this new version of the MMIC works at 3V6, because "the old one" did it at 7V5.
Greetings to all and thanks again
- EA1AWY Javier Muriedas (Gij¨®n, Asturias, Espa?a)
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Can both of you that have the failing waterfall try to do a screengrab using tinySA-App.exe? If the screengrab works there is at least one possible problem eliminated. --
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For more info on the tinySA go to https://tinysa.org/wiki/
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On Thu, Dec 31, 2020 at 11:12 PM, christophe christophe wrote:
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Hi all
The same in black.
I m trying different firmware and nothing change.?
Good year 2021.
Envoy¨¦ par myMail pour iOS
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Screenshots work? This can related to read error from LCD, TintSA CPU not have enouth memory for store all waterfall data, it just copy line down. Need check SPI SDI line from display to CPU
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Hi all The same in black. I m trying different firmware and nothing change.? Good year 2021.
Envoy¨¦ par myMail pour iOS
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If you use one of those inexpensive saw module transmitters as the oscillator, you can use the modulation input instead setting it fixed to the on rail install a potentiometer. This will permit you to adjust the frequency within a small range. The narrower your RBW is the more accurately the oscillator and the IF frequency have to be to each other. If it is 4Khz off you can't use the 3Khz RBW anymore because you are outside the window. Installing a pot and then adjusting the IF frequency to the center of the frequency you get with the pot lets you fine tweak for maximum trace before normalization and lets you peak the trace if your oscillator drifts slightly over temperature / time, It should be installed in a way that it is accessible from the outside of the enclosure. The adjustment range is not very much and depends on with what voltage you run the oscillator and what circuit configuration the manufacturer uses. I get +- about 15Khz. That is the same principle some of the older commercial tracking generators use when they have a manual track peaking function. The only way around that is to use a highly stable source for both the analyzer and the tracking generator i.e. lock them to GPS or use the same clock source so changes in both units track? I build a tracking generator for my 8Ghz GPS locked analyzer and ended up using a GPS locked oscillator so I can look at narrow BW and resolution.?
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Thanks for the suggestion Erik. I will check and report.
What I did observe was that changing the RBW varied the level delivered by the tracking generator. It was caused because the frequency of the 433.9MHz SAW oscillator did not match the IF of the TinySA. Measured on three different modules it was 433.822MHz, 433.85MHz and 433.9MHz. Introducing that offset in the IF of the TinySA, the measurements are correct with any RBW.
Biggs99: I don't know which couplers you mean
-- EA1AWY? Javier Muriedas? (Gij¨®n, Asturias, Spain)
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Thanks Eric, that worked a treat! Using a 20dB attenuator, I measured 29.0dB at 280MhZ on the SA.? When to High port, switched mode input, and then followed your guidance below to adjust it to the same reading (it was only off by 0.5dB or so).
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Does anyone have a reliable source for inexpensive couplers? I¡¯m a disabled vet and I have to watch my pennies
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IF you do a measurement with tracing generator you better set the RBW to manual and maximum Can you check if this removes the artifacts?
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For more info on the tinySA go to https://tinysa.org/wiki/
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Hi again, everybody.
I have built a tracking generator using a 433.9MHz transmitter as LO. The out of the 1st LO of the Tiny not enabled (30dB lower approximately) is amplified by a MAR-8A and is used as the high level input for the DBM. This is to reduce the 433.9MHz leakage back through the external and internal mixers. The supply comes from the Tiny and is a little low but it seems to work. Oscillator and amplifier draw 20mA.
I get a dynamic of 60dB. The photos of the measurements are from a 6.5MHz notch filter on the NanoVNA demo card and I don't know why the "artifacts" that appear in the curve are due. The deep and down are without normalizing and the light ones up after normalizing the signal.
If anyone has an explanation for them, I would be grateful.
Cheers
- EA1AWY Javier Muriedas (Gij¨®n, Asturias, Espa?a)
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Re: Aliexpress Zeenko store - Order does not arrive in Germany - Experience from other people?
Just a reminder. You can pay with PayPal in the Zeenko store on Alibaba. Just contact the contact person of the Zeenko shop (Maggie) and ask how to do the payment using paypal.
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For more info on the tinySA go to https://tinysa.org/wiki/
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Re: Aliexpress Zeenko store - Order does not arrive in Germany - Experience from other people?
Ordered my TinySA from Alibaba on 9/15 and received 9/24 in Texas.
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Oh thank you so much for the information! I missed that somewhere about the various options with the waterfall. Thank you so much for all the work you have put into this project!
Roy WA0YMH
On Wed, Dec 30, 2020, 11:28 AM Erik Kaashoek < erik@...> wrote: After enabling the waterfall a waterfall taking about 30% of the screen appears.
Tapping again switches to the big waterfall taking about 60% of the screen.
Tapping a third time disables the waterfall.
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For more info on the tinySA go to
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Re: Aliexpress Zeenko store - Order does not arrive in Germany - Experience from other people?
Hi, The covid has disrupted so much. A real surprise is when things arrive in a couple of days or so! 2020 should be named the year without a year! Stay safe. 73, Bill KU8H On Wed, 30 Dec 2020 09:23:01 -0800 "John" <ve3kkqve3kkq@...> wrote: I wonder if the global pandemic and Christmas flood of packages has
delayed your shipment. I ordered mine wisely(?) 8 Dec, Canada Post is
aware it is coming, all the news I have so far is that it on it's way
to Canada. I figure mine must be on one of those enviro ships that is
propelled by sails.
For years I would have packages returned by Canada Post because my
eleven year old house was not in their address database.
Sometimes it is a simple copying of address by the shipping Dept on
to your package, could be anything.
Coud be a policy somewhere that packages arriving on a certain date
remain in limbo for two weeks as a means to protect postal workers.
I hope your unit arrives safely.
John
VE7KKQ
On Wed, Dec 30, 2020 at 8:53 AM Erik Kaashoek <erik@...>
wrote:
Zeenko store is the store from Hugen so guaranteed to be reliable.
Aliexpress shipping adds complexity
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For more info on the tinySA go to
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After enabling the waterfall a waterfall taking about 30% of the screen appears. Tapping again switches to the big waterfall taking about 60% of the screen. Tapping a third time disables the waterfall. --
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For more info on the tinySA go to https://tinysa.org/wiki/
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Re: Aliexpress Zeenko store - Order does not arrive in Germany - Experience from other people?
I wonder if the global pandemic and Christmas flood of packages has delayed your shipment. I ordered mine wisely(?) 8 Dec, Canada Post is aware it is coming, all the news I have so far is that it on it's way to Canada. I figure mine must be on one of those enviro ships that is propelled by sails.
For years I would have packages returned by Canada Post because my eleven year old house was not in their address database. Sometimes it is a simple copying of address by the shipping Dept on to your package, could be anything. Coud be a policy somewhere that packages arriving on a certain date remain in limbo for two weeks as a means to protect postal workers.
I hope your unit arrives safely.
John VE7KKQ
On Wed, Dec 30, 2020 at 8:53 AM Erik Kaashoek < erik@...> wrote: Zeenko store is the store from Hugen so guaranteed to be reliable. Aliexpress shipping adds complexity
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For more info on the tinySA go to
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Forgive me for taking your time but if I might ask, what is the "big waterfall"? I thought that that there was just one waterfall?
Thanks, Roy WA0YMH
On Wed, Dec 30, 2020, 12:36 AM Erik Kaashoek < erik@...> wrote: Very weird, I checked again the v1.1-72 FW and water does fall.....
There is no setting for the waterfall and I have absolutely no clue what could cause this. Is the big waterfall also white?
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For more info on the tinySA go to
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Re: Aliexpress Zeenko store - Order does not arrive in Germany - Experience from other people?
Zeenko store is the store from Hugen so guaranteed to be reliable. Aliexpress shipping adds complexity --
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For more info on the tinySA go to https://tinysa.org/wiki/
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Re: Aliexpress Zeenko store - Order does not arrive in Germany - Experience from other people?
On 2020-12-30, at 12:48, Joerg ex-DB2OO <exDB2OO@...> wrote:
delivery to Europe particularly Germany
About 6 % of my AliExpress orders end in the ¡°dispute" process. I don¡¯t have more detailed break-down numbers, but this is a mix of shipment/customs issues (like apparently yours), destruction in shipment, quality problems, and occasionally outright fraud. Of all the ¡°disputes" I have had over the last half-decade, one (1) has not been resolved by AliExpress in my favor (or, if that was justified because there was only a small defect, mostly so). I rarely ever discuss alternative problem solutions with the sellers; if it didn¡¯t arrive OK in time, ¡°dispute" it is. Of course, having to wait for a shipment and the waiting time expiry, then possibly go through the dispute, and re-order from a different (or the same!) seller in parallel, adds more uncertainty. More and more AliExpress sellers have representatives in Europe, which adds (!) to the shipment cost, but reduces delay and uncertainty. But, in general, AliExpress simply is not for goods that you need soon. I got my TinySA from the Zeenko store via AliExpress, ordered 2020-07-24, shipped via AliExpress ÎÞÓÇÎïÁ÷-±ê×¼ [Worry-Free Logistics-Standard] 2020-07-29, in Germany on 2020-08-11, delivered 2020-09-08 [which apparently included the usual four weeks of German customs sitting on the package], and can¡¯t think of anything that could have gone any better with that purchase and shipment. But that experience is an anecdote, not data. Gr¨¹?e, Carsten
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John Cunliffe W7ZQ
