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Re: Looking for testers of his tinySA version

 

For now there are sufficient candidate testers.
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HBTE Files section:?/g/HBTE/files
Erik, PD0EK
Re: Looking for testers of his tinySA version

 

Erik,

I am certainly interested in this latest effort and would love to test it out - please do keep me advised - thanks,

Marty (KN0CK)
Re: Looking for testers of his tinySA version

 

I will be interested in the commercial version as well.? Let us know when it would be available.

73
Evan
AC9TU
Re: Looking for testers of his tinySA version

 

Hi,

I am not one of the testers you are looking for but I would probably be a customer when you get to that point. I hope you keep us informed.

73,

Bill KU8H

On 4/27/20 10:33 AM, erik@... wrote:
During the last weeks I have been a bit quiet here as most of my time when into designing, together with Hugen, of a self contained, ready build, hand-held version of the tinySA to be sold for a very acceptable price.
The outline and display are exactly the same as the nanoVNA and the tinySA will come with a housing.
As the HW performance now seems to be OK and the SW is more or less complete i could use the help of some (not many) testers.
Preferably people that already own (or have access to)? a spectrum analyzer and are active building something that requires a spectrum analyzer in the 0.1MHz till 350MHz range.
This tinySA can also capture 240MHz till 960MHz (with somewhat reduced performance and functionality)? and it can also be used as a signal generator (0-350MHz and 240MHz till 9060MHz)
If you think you could contribute to the testing feel free to send? me a PM with some info on the project you'd like the tinySA for.
There will only be a limited number of tester products.
Selected testers will receive a tinySA and are kindly requested to use it and feedback their experience.
I create a dedicated tinysa group for this purpose. /g/tinysa/topics
More information on this version of the tinySA can be found in this wiki
Please be patient as the wiki is running a bit behind.
--
HBTE Files section: /g/HBTE/files
Erik, PD0EK
--
bark less - wag more
Re: Looking for testers of his tinySA version

 

Erik, that looks great!

Nice idea to use the SI4432 direct for high frequencies.

I am sure you will be flooded with offers to test, and much as i would love to test this I also would like to continue with my ESP32 based version, though I am sure with my layout at least it will not be as good as this version as my version currently lacks proper screening.? I might steal the switching idea for high frequencies though!

Will there be an improved PC program developed to go with it?

I really have learnt a lot from this project, so many thanks for sharing it earlier.?

Dave M0WID
Re: Looking for testers of his tinySA version

 

Yay! Great news. I'll be waiting for the first production run. I am actually working on my own version of the tinySA, but I am not quite there yet, so I am willing to donate the parts back into the parts bin and use the commercial version. :)?

Karl Heinz - K5KHK
Re: Looking for testers of his tinySA version

 

Very nice, I was wondering if someone would pick it up as a commercial project, glad that it was you.
With a bit of luck it will be a success as the NanoVNA.


On Mon, 27 Apr 2020 at 16:33, <erik@...> wrote:
During the last weeks I have been a bit quiet here as most of my time when into designing, together with Hugen, of a self contained, ready build, hand-held version of the tinySA to be sold for a very acceptable price.





The outline and display are exactly the same as the nanoVNA and the tinySA will come with a housing.

As the HW performance now seems to be OK and the SW is more or less complete i could use the help of some (not many) testers.
Preferably people that already own (or have access to)? a spectrum analyzer and are active building something that requires a spectrum analyzer in the 0.1MHz till 350MHz range.
This tinySA can also capture 240MHz till 960MHz (with somewhat reduced performance and functionality)? and it can also be used as a signal generator (0-350MHz and 240MHz till 9060MHz)
If you think you could contribute to the testing feel free to send? me a PM with some info on the project you'd like the tinySA for.
There will only be a limited number of tester products.
Selected testers will receive a tinySA and are kindly requested to use it and feedback their experience.
I create a dedicated tinysa group for this purpose.?/g/tinysa/topics
More information on this version of the tinySA can be found in this wiki?
Please be patient as the wiki is running a bit behind.
--
HBTE Files section:?/g/HBTE/files
Erik, PD0EK

Looking for testers of his tinySA version

 

During the last weeks I have been a bit quiet here as most of my time when into designing, together with Hugen, of a self contained, ready build, hand-held version of the tinySA to be sold for a very acceptable price.





The outline and display are exactly the same as the nanoVNA and the tinySA will come with a housing.

As the HW performance now seems to be OK and the SW is more or less complete i could use the help of some (not many) testers.
Preferably people that already own (or have access to)? a spectrum analyzer and are active building something that requires a spectrum analyzer in the 0.1MHz till 350MHz range.
This tinySA can also capture 240MHz till 960MHz (with somewhat reduced performance and functionality)? and it can also be used as a signal generator (0-350MHz and 240MHz till 9060MHz)
If you think you could contribute to the testing feel free to send? me a PM with some info on the project you'd like the tinySA for.
There will only be a limited number of tester products.
Selected testers will receive a tinySA and are kindly requested to use it and feedback their experience.
I create a dedicated tinysa group for this purpose.?/g/tinysa/topics
More information on this version of the tinySA can be found in this wiki?
Please be patient as the wiki is running a bit behind.
--
HBTE Files section:?/g/HBTE/files
Erik, PD0EK
HP11713A "clone" - Attenuator & Relay driver #step_attenuators #arduino_programming

 

Hi all,

just wanted to introduce you to one my of latest projects which started with me buying a HP33322H step attenuator (0-110dB 10db steps) which I needed to be able to control.
So instead of buying an old used HP11713A and potentially having to repair it in the future I decided to build my own "clone".
Now I'm at stage where I can consider it "almost finished but working 90%" which means the progress to 100% done will be really slow :-)

Anyway without any further ado:

Best regards
Marcus
Re: tinySA input buffer

 

You can measure the distortion from your input buffer by comparing two measurements.
One with your input buffer.
Second with a high impedance attenuator (-5 to -6dB) before you input buffer.
If the harmonic level in the second measurement is lower there could be an impact of your buffer

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HBTE Files section:?/g/HBTE/files
Erik, PD0EK
tinySA input buffer

 

I want to look at vacuum tube boatanchor signals (mixer signals).
These are high impedance so I need some kind of input buffer I guess.

I thought about this because of the link to Hans's spectrum analyzer.? It has a high impedance input buffer:


It uses a MAX4178 which seems to be obsolete.? Do I want to find a substitute(any ideas)? or do some other kind of
impedance matching?? I have been able to see the signals on my tinySA? by using my 465 scope vertical output to buffer,
as well as using a FET input Bipolar output buffer I built.? I am wondering how much distortion I am getting
though.

73,
Gary
WB6OGD
Re: 0-500MHz fully analog sine generator you can build in one hour

 

The VCO can sweep very fast. Full range within 10mS.
No PLL to settle
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HBTE Files section:?/g/HBTE/files
Erik, PD0EK
Re: 0-500MHz fully analog sine generator you can build in one hour

Jerry Ponko AC9NM
 

You should be able to construct a ramp ot a triangle wave generator with most op amps or a programmable waveform generator like the AD9833. It depends on how fast/slow this oscillator can be swept. At this point I don't know the answer having never used it.

Jerry, AC9NM
Re: 0-500MHz fully analog sine generator you can build in one hour

 

The design from Hans Summers works very well and is easy to build



You could use a 10 turn potmeter for the center frequency
Make sure you select a opamp that can drive to ground.
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HBTE Files section:?/g/HBTE/files
Erik, PD0EK
Re: 0-500MHz fully analog sine generator you can build in one hour

 

Do you have a prefered version of the op-amp circuit for a sweeper like this?
0-500MHz fully analog sine generator you can build in one hour

 

Sometimes you need a swept sine generator and you don't have one available.
How about building one? Sounds complex but it is actually fairly simple.
If you search ebay for "12V RF controlled oscillator" there are many suppliers for a version that sweeps from about 500MHz to 1000Mhz for a price of 15$ per piece.
You need two of these modules, one 10dB attenuator and one mixer such as an ADE-1, either on a ready module for 10$ or as bare mixer for substantially less.
Connect one VCO with tuning input connected to ground to the mixer LO input? and one VCO with the tuning input used for frequency control with the 10dB attenuator to the RF input of the mixer.
Finally you add a 4 fold op-amp, two variable resistors (one for center frequency and one for span) and some more small components to generate the frequency control voltage and you have a wide range swept sinus generator.


The IF output of the mixer will deliver from 0 till 500MHz at about -10dBm and 2nd, 3rd and 4th harmonic are at least 40dB below the fundamental.
If you can not go down to zero Hz you have to interchange the VCO modules as the module with the lowest output frequency with tuning input connected to ground should be used as the variable VCO.
Have fun!
--------------------------------------------------------------------
HBTE Files section:?/g/HBTE/files
Erik, PD0EK
Re: New file uploaded to [email protected]

 

Just to explain a bit further.

The AGC curve actually tracks the pass band of the BPF as the AGC reacts to the total energy that enters the SI4432 and that is within rather broad borders of its "tuned" frequency. The selectivity you see in the RSSI is the result of DSP processing of the output of an I/Q mixer.
So if you now check what the AGC does you should see it reacting at a higher frequency because you have shifted the center frequency of the RX SI4432 in the passband of the BPF
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HBTE Files section:?/g/HBTE/files
Erik, PD0EK
Re: New file uploaded to [email protected]

 

¿ªÔÆÌåÓý

Erik,

IF_Freq = 433670000; seemed to be the "sweet-spot" for me, any lower and the amplitude of the reference signal started to reduce, and the "spur" seemed to move to the other side of the reference frequency.?

Jim - G3ZQC

On 05/04/2020 10:38, erik@... wrote:

The AGC gain going down at 13.7MHz indicated the IF frequency is not optimally aligned with the BPF.?
Try to reduce the IF frequency in steps of 0.1MHz
Don't go too far as this will reduce the sensitivity but you may see an impact on the "AGC noise"?
--
HBTE Files section:?/g/HBTE/files
Erik, PD0EK
_._,_._,_
Re: New file uploaded to [email protected]

 

The AGC gain going down at 13.7MHz indicated the IF frequency is not optimally aligned with the BPF.?
Try to reduce the IF frequency in steps of 0.1MHz
Don't go too far as this will reduce the sensitivity but you may see an impact on the "AGC noise"?
--
HBTE Files section:?/g/HBTE/files
Erik, PD0EK
Re: New file uploaded to [email protected]

 

Dave mine too in that setup.
vk3pe
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