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Yes,

It is done using ACTUAL POWER

Set to HIGH MODE
Connect a known level signal with level between -50dBm and -30dBm to the high input
Make sure the 1st tracking marker is positioned on the signal connected to the input
Do CONFIG/EXPERT CONFIG/ACTUAL POWER and enter the level of the applied signal.

On Fri, Jul 31, 2020 at 06:33 AM, Lawrence Macionski wrote:

Oh Boy--- Santa is coming in August for me....

Lawrence,
? ?The was pretty much my feeling when I received the pre-production tinySA.

? ?BTW, the last sentence of the of the un-boxing should have read:

? ? "Erik and hugen did not drop the ball and let the packaging be an after thought."

? My proof? reading seems to get worse as I get older.

- Herb

Oh Boy--- Santa is coming in August for me....

Erik,
? While reading your recent wiki entry on coax cable impact, I noticed your screen captures indicated you had performed a HIGH input level calibration:

LEVEL calibrated: white system colors? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?LEVEL un-calibrated: red system colors
? ? ? ? ? ?

Have you developed a procedure for performing a HIGH input level calibration that has not been posted yet?

- Herb

Erik,

FW release v1.0-42
One of the disadvantages of the tinySA as signal generator is the absence of a nice big dial you can use to tune the output frequency.
So I added a new feature: value button dragging.
This works in both output modes.
You can touch and hold the frequency button in the middle and when dragging left/right the frequency will decrease/increase with a speed relative to the distance to the center of the button.

Can some of you provide feedback if this is usable?

For those not used to a sensitive device as a spectrum analyzer I added a page to the wiki to illustrate the (im)perfection of coax shielding.

This shielding is particularly important with a close proximity strong transmitter at high frequencies

Putting absorbing tape at the inside of the shieldings may help, in particular for the high input shield as this may reduce the TXCO harmonics.

Is it worth lining the sandwich pcb which is in lieu of a case on many of the units with conductive sticky tape such as used inside some cellphone plastic cases? I understand that this stuff is better than extra solid metal screening as it absorbs, rather than reflecting some signal back into the circuitry.

I have just ordered a roll from Fleabay and am waiting for my TinySA to arrive.

Steve, G7psz

Indeed, all power regulation is linear. NO switch mode supplies inside the tinySA
The biggest source of disturbance is the 30MHz TXCO inside the LO can causing 30MHz harmonics on the high input.
The disturbances in the low input mode are caused by FM,DAB Mobile phone and other nearby transmitters that blast through the tinySA shielding.

On Thu, Jul 30, 2020 at 08:16 PM, Larry Rothman wrote:

Herb,

?

Erik said the unit uses an analog power supply to eliminate noise when plugged into a usb port.?

?

Does it now use a low dropout 3v reg directly off the Li battery? The only schematic is for the RF side so I'm curious about the supply section.?

?

Thanks

?

Hi Larry,
? ?Erik has said he will only release portions of the schematic as needed by users to troubleshoot any failures with there devices.? I believe that is a wise choice after witnessing how quickly clones of the NanoVNA-F and SAA-2 hit the market.? The latest version 3.x of the NanoVNA-F also will not release full schematics and the SAA-2 producers are wishing a little late they had not done so.

? ?My pre-production tinySA has been working so well I hesitate to open the case until the production level unit I ordered arrives.? I can say that I have operated the tinySA from usb power and disconnected from the PC on battery power, at the lowest 3kHz rbw I can see down -100dBm or better from either source. Almost all internally generated noise is leakage from the LO.? Using a 3kHz rbw and a wide span, the sweep time is in the seconds, but if you need to measure down to -100dBm ...

? I did look back through my notes and Erik wrote the following:

The tinySA power supply circuit is linear (no switched power supply)? using LDO regulators directly from the battery. Separate regulator for RF part. L/C filter to eliminate regulator noise.?

After Eriks's experience with switched power supply noise as a user of the original NanoVNA, his use of a linear regulator in the tinySA is not a surprise.? He also reserved at spot on the PCB for a huge Vdd-RF capacitor (C53) that can be added later if it becomes required.

- Herb

Herb,

My photographic skills are next to nil, but for the group I would like to present my "un-boxing" impression of a pre-production tinySA.

1. Hugen has been producing products for a while now and one of the ways he has set himself apart from other OEM's is with his distinctive packaging.? Fly by night cloners don't want to spend extra money reproducing hugen's custom packaging, so it helps buyers to distinguish hugen's original products from reproductions.? The? tinySA came in a 7.5" x 5" black box.? The box has a "brushed" feel to it and has a distinctive gold logo and gold lettering printed on top. If you've purchased a NanoVNA-H4 or NanoVNA-H 3.4 from hugen then you are familiar with this style package.



2. Inside the box is the tinySA with accessories.? There are molded compartments for the tinySA and all of the accessories.? There was no documentation or the Menu Structure Map that hugen usually includes with the NanoVNA. I expect by the second production run a Menu Map will make an appearance.? There is a sticker on the inside that directs the consumer to http://tinysa.org/? which re-directs to the more useful tinySA Wiki page.

? The front panel of the tinySA has the same distinctive logo as printed on the outside of the box.? Both HIGH and LOW ports are labeled and also have bi-directional arrows indicating the input/output functionality of each port. Unlike the NanoVNA, I have no complaints with the multifunction switch on top of the tinySA.? It seems more responsive than the same switch on the NanoVNA.? I even prefer it to the push buttons on the S-A-A-V2 because of my fat fingers.



3. The included accessories are:? a.) Internal battery (1950mAh??);? ?b.) one USB-C to USB-A cable;? c.) two 8.5" rg-174?? cables;? d.) one sma bullet adapter;? ?e.) one 12" telescoping antenna;? and? ?f.)? one wrist lanyard/guitar pick stylus.
? ? Sorry about the non-metric measurements, at my age its too late to learn new tricks.



4. The telescoping antenna is a thoughtful inclusion.? It allows beginners to use the tinySA by exploring the FM band and other radio bands without purchasing additional accessories.? It is also useful for sniffing out sources of EME in the shack.
?


5. The rear of the tinySA has appropriate product information including: Frequency range, power specification, hardware version and serial number.


? My overall impression of the tinySA "un-boxing" experience was very positive.? It gave me a good feeling about the tinySA even before turning it on.? Erik and hugen did drop the ball and let the packaging be an after thought.

- Herb

On Thu, Jul 30, 2020 at 02:48 PM, @KC2TAU wrote:

Can the TinySA be connected to a USB power supply and operate directly off of the USB supply thus not discharging the internal battery or does the USB connection only provide power for charging?
===========================

? ?If you are familiar with the NanoVNA, then the tinySA is powered similarly.? If not, then yes the tinySA can operate off either USB power or the internal battery.? The tinySA USB port is used for charging, powering and for communications with a PC.

? ?When connected to a PC with an active USB port, charging occurs whether the tinySA is powered on or off.? My beta tinySA did not have a battery installed and I was able to operate it from my PC's USB port or from an ac or portable USB charger.

- Herb

Hello,

Can the TinySA be connected to a USB power supply and operate directly off of the USB supply thus not discharging the internal battery or does the USB connection only provide power for charging?

Thank you.

On Wed, Jul 29, 2020 at 08:40 PM, DiSlord wrote:

See this comment
/g/tinysa/message/391

?>level (in dBm)? = ( byte 3 (0x5C) + (byte 4 (0x00) * 256) )? / 2 - 128 -> -82dBm

Now need divide on 32 and sub 128

Thanks DiSlord,
? ? I figured it had something to do with the recent change that needed to be made in TinySA.exe setting.? After I slept on it last night that was the first thing I was going to try this morning.? The issue probably deserves a "How do I convert the binary values returned from the scanraw command?" in the Wiki.

Herb

Got my shipping confirm today. I had ordered the unit ~11:30 EDT, 23JULY.?

Not a bad turnaround! Tnx es 73!

I was wrong...if the distortion is due to the analyer’s first mixer, the third order products will indeed change twice as much as the change in input tones. ?The three to one change I mentioned is for a DUT.
Gary
W9TD

When dropping both tones by 10dB, the intermodulation products should drop by 30 dB. It is third order distortion after all.
Gary
W9TD