Re: Interesting use for a dummy load
Hi Dave,
coupling of the RF will be variable according to frequency, length and position of the tinySA antenna, so even when doing a relative measurement, you may have a big difference in levels.
See a post here
where I described how I made a 20W dummy load into a 40 dB attenuator, it's not a perfect 50 Ohm match at both ports, but surely good enough for "amateur" work, and I get consistent levels. Of course, 40 dB may not be enough to measure a TX output, more attenuators may be needed.
Another solution is to build the power sampler (link is in my post).
Luc ON7DQ
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Interesting use for a dummy load
Not having a suitable attenuator to hand, I found that a dummy load radiated enough RF for the tinySA to analyse if held close enough.
I'm not interested in the exact amplitude of the harmonics, just relative; I see that I have a harmonic on my TX, but it's way down.
-- Dave VK2KFU
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Re: Uhf TV monitoring, Antenna testing
Normally TV signals should be below -45dBm on the cable so connecting to the high input is not a risk. For many other signals an attenuator is recommended. Simple guideline is to keep the high input level below -30dBm to avoid spurious signals generated inside the tinySA --
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For more info on the tinySA go to https://tinysa.org/wiki/
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Re: Uhf TV monitoring, Antenna testing
On Thu, Sep 30, 2021 at 06:47 AM, spiff72 wrote:
When using this for TV antenna aiming or just for inspection of the signals on a cable TV feed, does the fact that the cable lines are usually set up for 75 ohm make any difference here??
It does not make an important difference, only the indicated level is some dB wrong
Is the tinySA set up for 50 ohms??
Yes
I am shopping around for a simple F-type to SMA adapter and was curious if there is anything special I need to consider there.? (I only have BNC-SMA adapters right now).
Nothing special, as long as it connects to SMA it should work.
I also asked about the presence of the FM broadcast signals on your youtube video, but you didn't answer that question.? Is this common practice in your area??
Yes, FM broadcast is on the cable in Europe.?I checked the signal on the cable before the RADIO/TV splitter. Not sure this will continue as the providers want to remove all analog content. ? --
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For more info on the tinySA go to https://tinysa.org/wiki/
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Re: Uhf TV monitoring, Antenna testing
I saw the video you suggested. However, I have a question. In other videos I have seen they say that an attenuator is required on the high side. Is that correct, or can direct testing of tv signals be done without it?
--
Joe-NP3AR
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Re: Uhf TV monitoring, Antenna testing
I made a comment on your above linked youtube video, but as a relative newbie to RF, I have some questions...
When using this for TV antenna aiming or just for inspection of the signals on a cable TV feed, does the fact that the cable lines are usually set up for 75 ohm make any difference here?? Is the tinySA set up for 50 ohms?? I am shopping around for a simple F-type to SMA adapter and was curious if there is anything special I need to consider there.? (I only have BNC-SMA adapters right now).
I also asked about the presence of the FM broadcast signals on your youtube video, but you didn't answer that question.? Is this common practice in your area?? I have not heard of this being the case in the US.
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Re: Uhf TV monitoring, Antenna testing
Sorry I sent the wrong message.
Sep 30, 2021 2:09:40 AM Jose Cruz via groups.io <latinhawk@...>:
toggle quoted message
Show quoted text
My question is what is the status of my order? You snswered me with something else.
Sep 30, 2021 1:57:40 AM Erik Kaashoek <erik@...>:
Look here:?
Its using cable for demonstration but the type and strength of signals should be comparable when using a good antenna
Towards the end it is shown how you can use a TV signal to calibrate the high input
--
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For more info on the tinySA go to https://tinysa.org/wiki/
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Joe-NP3AR
--
Joe-NP3AR
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Re: Uhf TV monitoring, Antenna testing
My question is what is the status of my order? You snswered me with something else.
Sep 30, 2021 1:57:40 AM Erik Kaashoek <erik@...>:
toggle quoted message
Show quoted text
Look here:?
Its using cable for demonstration but the type and strength of signals should be comparable when using a good antenna
Towards the end it is shown how you can use a TV signal to calibrate the high input
--
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For more info on the tinySA go to https://tinysa.org/wiki/
--
Joe-NP3AR
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Re: Uhf TV monitoring, Antenna testing
Look here:? Its using cable for demonstration but the type and strength of signals should be comparable when using a good antenna Towards the end it is shown how you can use a TV signal to calibrate the high input --
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For more info on the tinySA go to https://tinysa.org/wiki/
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Uhf TV monitoring, Antenna testing
New here. Can't find where to add my callsign. I'm in the process of replacing my tv antennas.I receive signals from different direction and want to use the TinySA when it arrives to point my antennas and determine if amplification is needed. Open to ideas. Thanks.
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Re: FM deviation measurement (narrow and wide)
Side cutters are a much more definitive, and emotionally
satisfying, fix!
73, Stay Safe,
Robin, G8DQX
On 29/09/2021 03:11, DAVE REISER wrote:
toggle quoted message
Show quoted text
Test all your cables and mark the power
only ones with a sharpie pen.? I need to load the proper
drivers I believe.
?
Kind Regards,
Dave
Dave Reiser
Phone:
301-216-5394
Mobile:
301-802-1929
Email:?
davereiser2outlook.com
520 Russell Avenue, Gaithersburg, MD
20877
?
?
I had this problem and it turned out my
USB cord that I was using was actually not made with a data
line. And apparently it was just for charging. Change chords
and fixed my problem.
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Re: FM deviation measurement (narrow and wide)
Test all your cables and mark the power only ones with a sharpie pen.? I need to load the proper drivers I believe.
?
Kind Regards,
Dave
Dave Reiser
Phone:
301-216-5394
Mobile:
301-802-1929
Email:?
davereiser2outlook.com
520 Russell Avenue, Gaithersburg, MD 20877
?
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Show quoted text
From: [email protected] < [email protected]> On Behalf Of
keverett
Sent: Tuesday, September 28, 2021 5:27 PM
To: [email protected]
Subject: Re: [tinysa] FM deviation measurement (narrow and wide)
?
I had this problem and it turned out my USB cord that I was using was actually not made with a data line. And apparently it was just for charging. Change chords and fixed my problem.
?
On Tue, Sep 28, 2021, 1:05 PM Erik Kaashoek <erik@...> wrote:
See?
and end of?
in the later FW MEASURE/FM menu enables a calculation of the deviation based on the observed signal
--
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For more info on the tinySA go to
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Re: FM deviation measurement (narrow and wide)
I had this problem and it turned out my USB cord that I was using was actually not made with a data line. And apparently it was just for charging. Change chords and fixed my problem.
On Tue, Sep 28, 2021, 1:05 PM Erik Kaashoek < erik@...> wrote: See?
and end of?
in the later FW MEASURE/FM menu enables a calculation of the deviation based on the observed signal
--
------------------------------------------
For more info on the tinySA go to
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Re: FM deviation measurement (narrow and wide)
See? and end of? in the later FW MEASURE/FM menu enables a calculation of the deviation based on the observed signal --
------------------------------------------
For more info on the tinySA go to https://tinysa.org/wiki/
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FM deviation measurement (narrow and wide)
Can the TinySA be used to measure the FM deviation of a transmitter? E.g. the narrow of a 144 MHz TX or the wide of a FM broadcast one? Thanks.
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Re: tinysa can't connect or see in com port or usb connections for PC windows 7
#tinysa
On Sun, Sep 26, 2021 at 10:37 PM, EB4APL wrote:
Yes, it can work but only if you have the DFU mode drivers installed.
Ah OK, I thought that the TinySA app installed the drivers too, my mistake. The DFU drivers must be installed separately (and correctly) for this to work. Regards, Martin
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Re: tinysa can't connect or see in com port or usb connections for PC windows 7
#tinysa
Yes, it can work but only if you have the DFU mode drivers
installed. Most problems trying to upgrade the firmware (using DFU
or whatever) are caused by lacking this driver, that is not the
normal one for running the SA controlled by a PC.
Regards,
Ignacio EB4APL
El 26/09/2021 a las 17:49, Martin via
groups.io escribi¨®:
On Sat, Sep 25, 2021 at 04:23 PM, DAVE REISER wrote:
BTW, It works beautifully with a Windows 10 SA
program.
Which SA program ?
If it is the Tiny SA app, it has a built in upload feature you can
use, which makes it all very easy.
Use the button bar on the top row with the two black triangles
Regards,
Martin
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Re: tinysa can't connect or see in com port or usb connections for PC windows 7
#tinysa
On Sat, Sep 25, 2021 at 04:23 PM, DAVE REISER wrote:
BTW, It works beautifully with a Windows 10 SA program.
Which SA program ? If it is the Tiny SA app, it has a built in upload feature you can use, which makes it all very easy. Use the button bar on the top row with the two black triangles Regards, Martin
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Re: tinysa can't connect or see in com port or usb connections for PC windows 7
#tinysa
Cable is good.? Any other ideas?
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Re: tinysa can't connect or see in com port or usb connections for PC windows 7
#tinysa
Thanks I¡¯ll? try a different cable.
?
Kind Regards,
Dave
Dave Reiser
Phone:
301-216-5394
Mobile:
301-802-1929
Email:?
davereiser2outlook.com
520 Russell Avenue, Gaithersburg, MD 20877
?
toggle quoted message
Show quoted text
From: [email protected] < [email protected]> On Behalf Of
spiff72
Sent: Saturday, September 25, 2021 2:05 PM
To: [email protected]
Subject: Re: [tinysa] tinysa can't connect or see in com port or usb connections for PC windows 7 #tinysa
?
I can confirm the USB cable issue, too.
Yesterday, I went to update firmware using the same PC I originally updated FW with right after I got the tinySA.? I couldn't get it to recognize the tinySA and I spent 20 minutes trying to figure it out.? Finally tried a different cable, and everything worked
as expected.
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DAVE REISER WA3TRS
keverett
Andrea I2UEA