Re: What is the best way to store the TinySA Ultra when unused but near to radio sources ?
I store my TinySA on my work bench, the inputs are capped with 2 old small SMA loads with the center pin removed ( 2 nanovna open calibration loads would work also but cost more than the tiny loads I found for a quarter a piece at a hamfest). I just use a pair of needle nose pliers and pull the center pin out.The limited usage cycle of SMA connectors is because of the wear on the center pin not the outside thread. using them prevents dust and static from entering the connector and I don't have to worry handling it when I need the space for something else. To distinguish them from the many other same style loads? I have collected over time,I covered the whole thing with a piece of yellow shrink wrap. Now all the yellow caps are for my different SMA input devices.
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John
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Re: What are sweep speed hardware bottlenecks?
Is this so called filter charge time?
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What is the best way to store the TinySA Ultra when unused but near to radio sources ?
I usually keep my TinySA Ultra in a drawer with the default telescopic antenna extended and attached to the device, this is both for convenience and to avoid wearing out the antenna connector itself.
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I know that the surrounding radio signals reach the circuitry of the TinySA Ultra through the antenna even if it is turned off, and I was wondering if in the long run this might not put some kind of stress on the spectrum analyzer, diminish its performance, or promote its breakdown.
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For example, a few meters away from the TinySA Ultra are my Ubiquiti antenna from a radio link and an access point with a power output of 23 and 20 dBm respectively, which are detected transmitting at a level that can reach -40 dBm where I have stored the device.
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Does it make sense to take additional precautions, such as removing the antenna, or would these precautions be useless and unnecessary ?
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Re: TinySA not connecting to PC over USB
I hate when I do things like that!
John, all...
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It is confirmed.... I TOTALLY failed to think of the fact that I needed a DATA capable USB-C cable.
Sigh.... Not telling anyone at work about this. I'll never live it down!?
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73, Tim KA4LFP
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Re: TinySA not connecting to PC over USB
The problem isn't specific to usb-c either.? ?I've had the same issue with micro usb.? Having dozens of cables around the house some time back I decided to use a paint marker and put a dot on the cables rubber connector boot that were known good.? ?
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Andy
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Re: Signal level too low or not on frequency
thank you Toni
I already did this calibration in the past?and all went with no problem
Maybe meanwhile there has been a drift? of some component (?) Anyway?I'll follow the note?at?the link you kindly sent and report back
Adri
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----- Messaggio originale -----
Inviato: 27/08/2024 00:53:32
Oggetto: Re: [tinysa] Signal level too low or not on frequency
have a look to the wiki (TinySA Ultra menu tree):?
- ?requires an external 5.34GHz signal to remove the harmonic step at 5.34GHz.
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I think you question was answered several times!!
However, to clarify:
1.You manual confuses things by using dBu when they mean dBuV
2. 0dBuV = -107dBm
3. you have now added some more confusion into the mix with:
" When setting up, the ratio of levels in dB is taken as 0 dB? = 0.5 ?V (in a closed circuit)."
This appears to mean that the manual is dealing with emf and not pd, so the voltage will drop by half when leaded with 50ohms (assuming a 50 ohm generator) and they have fudged things by moving the reference to 0.5uV from 1uV.
In that case 0dBu would be -113dBm. (half the voltage, 1/4 of the power ie -6dB).
4. So use any of the online calculators to convert from dBuV to dBm and then subtract 6dB from the answer to account for the 0.5uV reference level shift.
73
Jeff G8HUL
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-----Original Message-----
From: tinysa@groups.io <tinysa@groups.io> On Behalf Of ????????? ?????????
Sent: 26 August 2024 17:22
To: tinysa@groups.io
Subject: Re: [tinysa] Dbu
Hello, so I didn't receive an answer as to what it would be equal to.
Tell me how many dBm it will be: Note: When setting up, the ratio of levels in dB is taken as 0 dB? = 0.5 ?V (in a closed circuit).
Alignment Preparation & Precautions
A 50-ohm RF Dummy load and in-line wattmeter must be connected to the main antenna jack in all procedures that call for transmission, except where specified other- wise. Correct alignment is not possible with an antenna.
After completing one step, read the following step to determine whether the same test equipment will be re- quired. If not, remove the test equipment (except dummy load and wattmeter, if connected) before proceeding.
Correct alignment requires that the ambient tempera- ture be the same as that of the transceiver and test equip- ment, and that this temperature be held constant between 68°~ 86°F (20° ~ 30°C). When the transceiver is brought into the shop from hot or cold air, it should be allowed time to come to room temperature before alignment.
Whenever possible, alignments should be made with oscillator shields and circuit boards firmly affixed in place.
Also, the test equipment must be thoroughly warmed up before beginning.
Note:Signal levels in dB referred to in this procedure are based on 0 dB? = 0.5 ?V (closed circuit).
Menu Frequency Output Level of SG
01: HF1RXG 1.8 MHz Band 9 dBu
02: HF2RXG 7 MHz Band 9 dBu
03: HF#RXG 21 MHz Band 6 dBu
04: 50MRXG 50 MHz Band 0 dBu
05: VHFRXG 144 MHz Band 0 dBu
06: UFFRXG 430 MHz Band 0 dBu
SSB S-Meter Adjustment
r Tune the transceiver to the 21 MHz band in the CW mode. Inject an RF signal from the signal generator at
36 dB? output.
r Select menu item “07: SSB-S9” and press the [A] key to set this parameter.
r Tune the transceiver to the 21 MHz band in the CW mode. Inject an RF signal from the signal generator at
86 dB? output.
r Select menu item “08: SSB-FS” and press the [A] key to set this parameter.
FM S-Meter Adjustment
r Tune the transceiver to the 144 MHz band in the FM mode. Inject an RF signal from the signal generator at
0 dB? output, with ±3.5 kHz deviation FM Modula- tion of a 1 kHz tone.
r Select menu item “09: FM-S1” and press the [A] key to set this parameter.
r Increase the output level of the signal generator up to
25 dB?. Select menu item “10: FM-FS” and press [A] key to set this parameter.
Did I understand correctly that I hang a 50 ohm resistor (load) at the TRX input through a tee and connect a generator 0 dB? = -113 dBm, 6 dB? = -97.4 dBm, 9 dB? = -93.9 dBm?
пт, 23 авг. 2024 г., 08:42 David Reed via groups.io <> <david.reed346@... <mailto:gmail.com@groups.io> >:
So did I!
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Thank you from the bottom of my heart
Using the nice calculator Erik pointed to, and the fact that the text specifies? 0.5?V = 0 dB?:
From the calculator, ?0.5?V =? -6 dB?V?
So -6 dB?V corresponds to 0 dB?.
So subtract 6 from each of the dB? values in your instructions to convert to dB?V, then use the calculator to convert dB?V to dBm, giving:?
9 dB? -> -104 dBm
6 dB? -> -107 dBm
0 dB? -> -113 dBm
36 dB? -> -77 dBm
86 dB? -> -27 dBm
25 dB? -> -88 dBm
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What is the value of capacitors C34 and C35 for TinySA Ultra?
Their capacity influences the LNA's self-excitation stability and, implicitly, reliability.
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If you are trying to align a Yaesu transceiver, such as the FT 817/857/897 series, don't expect to be able to set exact values. Also note that the S-Meter scale does not have the same dB value between S units. The law is also different when NBFM is selected.
The alignment instructions should be treated as a guide only, otherwise you will tie yourself in knots. This is often true with a lot of older radios and alignment instructions.
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There was often a lot of variation during production, due to component tolerances, and manual alignment processes, and, as is more likely now, after years if use, the aging of components and physical movement of parts.
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Regards,
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Martin
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Re: TinySA Ultra: generating frequency.
On Mon, Aug 26, 2024 at 12:07 PM, Erik Kaashoek wrote:
? "Highest accuracy" mode is also mode accurate in amplitude
Big thanks!
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Re: TinySA not connecting to PC over USB
It's on the internet now. You're hosed. :D On Mon, 26 Aug 2024 17:28:42 -0700 "Tim Reimers KA4LFP via groups.io" <treimers95@...> wrote: Not telling anyone at work about this. I'll never live it down! -- 73 -Jim NU0C
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Re: TinySA not connecting to PC over USB
John, all...
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It is confirmed.... I TOTALLY failed to think of the fact that I needed a DATA capable USB-C cable.
Sigh.... Not telling anyone at work about this. I'll never live it down!?
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73, Tim KA4LFP
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Using the nice calculator Erik pointed to, and the fact that the text specifies? 0.5?V = 0 dB?:
From the calculator, ?0.5?V =? -6 dB?V?
So -6 dB?V corresponds to 0 dB?.
So subtract 6 from each of the dB? values in your instructions to convert to dB?V, then use the calculator to convert dB?V to dBm, giving:?
9 dB? -> -104 dBm
6 dB? -> -107 dBm
0 dB? -> -113 dBm
36 dB? -> -77 dBm
86 dB? -> -27 dBm
25 dB? -> -88 dBm
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Or learn logarithms.? Ya dun't need no cack'a'later!
Dave - W?LEV
The receiver should have 50 ohm input so no need for the extra 50 ohm resistor.
Please convert all dBuV to dBm(W) using 50 ohm system impedance and life becomes easy
Have a look at this nice calculator:
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--
Designer of the tinySA
For more info go to
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Re: Signal level too low or not on frequency
have a look to the wiki (TinySA Ultra menu tree):?
- ?requires an external 5.34GHz signal to remove the harmonic step at 5.34GHz.
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Re: WiKi updated to include generator mode menu
OK, that's right, thanks Erik.
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About TRIGGER/AUTOSAVE it could also be indicated that the previous INTERVAL parameter can also determine the time between saves, (provided that the trigger level has been exceeded).
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Toni
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Signal level too low or not on frequency
after doing the standard calibration I tried to do the calibration above 5.54GHz and this was the response The cable used is the standard one but the response did not change even using high quality cables Has it happened to anyone else? Is there some special procedure?
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The receiver should have 50 ohm input so no need for the extra 50 ohm resistor.
Please convert all dBuV to dBm(W) using 50 ohm system impedance and life becomes easy
Have a look at this nice calculator:
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--
Designer of the tinySA
For more info go to
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John Cunliffe W7ZQ
Jim Shorney
