That sounds very promising. There are a few wide band amps on Ebay which are in aluminium cases. I would probably get an open one, shorten the board and fabricate a box. I would be worried by the strain on the sma connector.

Maybe a future Tinysa could have a built-in switchable amp, which would then give a 60db controlled input range, with the built-in attenuator (woops, I am suggesting future possibke developments and I promised I would not do that any more).

Steve L. G7PSZ

On Tue, Aug 25, 2020 at 08:58 AM, Lee wrote:

Thank you to all.? I just bought a NanoVNA and figured out it will not do what I want easily as a tinysa

Lee,
? The two instruments compliment each other's capabilities so having both is a bonus.? At some point you will want to check the impedance of a device, verify the through loss of a cable or attenuator and measure the return loss of a an antenna.? These are all things the NanoVNA can accomplish easily.

? With those two instruments, and an oscilloscope and multimeter, you will rival the measurement capability of small labs from a decade ago.

- Herb

? - Herb

On Tue, Aug 25, 2020 at 07:44 AM, Erik Kaashoek wrote:


After a marker search should using the lever jump from maximum to maximum or just move the marker to any position? Or should this depend on what previous action was done (e.g. left/right marker search (jump) or peak search (any position
==============================================
Erik,
? Both of those actions make sense to me.? My expected behavior was that after peak search the marker would be in normal mode.? If the user wanted to jump peak to peak afterwards they could search max-left/right, otherwise the lever would just move the marker to any position.

- Herb

Hi,

You shouldn't have much trouble selling it to somebody else for most or all of what you paid.

73,

Bill KU8H

bark less - wag more

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Thank you to all.? I just bought a NanoVNA and figured out it will not do what I want easily as a tinysa

On Tue, Aug 25, 2020 at 05:58 AM, Stephen Laurence wrote:

is it possible to put the vcc direct to the ?tinysa ?input sma

Yes, there is a DC blocking capacitor at the input so you can put the Vdd to the SMA center pin using an appropriate inductor. Best to add a switch too

On Mon, Aug 24, 2020 at 12:30 PM, Roy Appleton wrote:

Could you link to your source of the amp?

This is a SPF5189Z amp. Many are available on eBay but make sure you buy from a reputed seller and check the current drawn as there are many fake SPF5189Z components on eBay.
Officially it should run from 5V/100mA but for low input levels 3.3V/70mA works as well.
They work well below 50MHz

Note added, see:?

On Mon, Aug 24, 2020 at 10:45 AM, hwalker wrote:

Just updated to v1.0-59.? Internal attenuation issue is resolved.? Still having issue with problem 1 as follows:

Herb,

After a marker search should using the lever jump from maximum to maximum or just move the marker to any position? Or should this depend on what previous action was done (e.g. left/right marker search (jump) or peak search (any position)

I am impressed.

However to make it a bit easier, is it possible to put the vcc direct to the ?tinysa ?input sma (assuming there is a blocking capacitor) so that it is similar to a bias tee ( is that what they are called?). Then the lna (also with a blocking capacitor) only has to be connected to the sma, without the need for the power lead.

Steve L. G7PSZ

Thank you Larry.? That was exactly the problem.? My thinking was backwards from ST's.? The first time I used the utility, I mistakenly used "upload".? Once I refreshed the .dfu file from Erik's site and "upgraded", all went well.

Brent

Brent,

On Mon, Aug 24, 2020 at 10:54 PM, Lee wrote:

Is there a good source from China or elsewhere with fast shipping??

I just received mine today and ordered directly from Maggie on 07/24 via messaging using the to ask how to make payment for via paypal from this link:

The total was $64.59 usd, though if I understand correctly that was for HKDHL and shipped out faster since was sold out at the time I ordered and they were waiting for the next production batch. ?The progress was updated with confirmations via email after a few days and the service is the best I've experienced on Aliexpress.? Really excited, even being so busy at the moment!

Something did go wrong with your FW update as the version should read v0.1-59.

In a couple of weeks there will be a large batch available on Amazon

Waiting for Amazon to get them .?? They have a lot of NanoVNA at reducing prices.?? Is there a good source from China or elsewhere with fast shipping?? Hunting for some QRM.

I'm clearly missing something.? I used the update files pointed to in this thread with the DfuSE Demo (V3.0.6) and all _seemed_ to go well, erasing, writing and verifying, but after a power cycle reset, the version still read V1.0-39 unlike the file name of V1.0-59.? I _think_ I've read all of the update procedure and the ST Micro tool doc, so now I'm unsure what else to try.

Note that I just received my tinySA today from AliExpress.? About 30 days transit time and it arrived in great packaging and perfect shape.

Thanks in advance,
Brent, AB1LF

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Thank you.

On Mon, Aug 24, 2020 at 08:49 AM, EB4APL wrote:
.....Is there a more recent version of tinySA.exe than 1.0.7528.21513?

=======================================================

Ignacio,
? ? The latest tnySA.exe release can always be accessed using the following links:

? Indirectly:??? Directly:? ?? ?

? The current latest version is dated:?2020-08-11

- Herb