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Re: DTT spectrum in "high input"
Thank you very much Eric, for your quick and efficient response. It looks better than I thought. I believed that the channels would appear widened when received above and below the LO frequency with the available IF being less than 1MHz. It also supposed that there would be a "hump" in the central part when adding the powers of both recepcioners (above and below LO).
- EA1AWY Javier Muriedas (Gijón, Asturias, Espa?a) |
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Re: tinySA Un-Boxing
On Fri, Jul 31, 2020 at 06:44 AM, hwalker wrote:
My proof? reading seems to get worse as I get older. Personally, coming from a cyber security situational awareness... I don't comprehend all the wireless infrastructure need and implemented other than to create electromagnetic spectrum situations.? Especially when the specific transmissions systems methods have been demonstrated very clearly to project sound as with acoustic hailing devices from the ultrasonic range to lasers... and also burn skin throughout the range of RF to microwaves like with the active denial system.? ?As with Cuba, China, Moscow and elsewhere since the 1950's and most likely prior... even with high level Diplomats, Staff and others... the dangers of sound, body and mind control weaponized systems will be actively denied.?? More reason to invest in wide frequency range portable spectrum analysis systems.? Not only for testing and detecting the typical signals, jamming, noise, static and interference potential.? Really awesome to see such price point and field capabilities.? Even if for some is only less space on the bench.? Thanks for the review Herb and others.? Eagerly looking forward to my order being received.? ?Neat to know can message and pay via Paypal too on Ali express.? ? |
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DTT spectrum in "high input"
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Hi all. I come to this group from the nanoVNA group. I don't have a tinySA yet but I will surely buy one. I would like to see a sweep of the "high" input of the analyzer scanning the UHF DTT band to know how the 8MHz channels are displayed without the 433.9MHz bandpass filter. Thanks in advance-- EA1AWY? Javier Muriedas? (Gijón, Asturias, Spain) |
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Re: Coax cable shielding
Attenuation of double shielded coax is around 90dB so that would make that base station signal 0dBm? On Fri, 31 Jul 2020 at 14:27, Erik Kaashoek <erik@...> wrote: 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. |
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Re: New FW: Experimental feature added: value button dragging
On Fri, Jul 31, 2020 at 06:02 AM, Erik Kaashoek wrote:
FW release v1.0-44Erik, ?v1.0-44 fixes the issue that was introduced regarding the multifunction switch.? The dragging left/right was kind of awkward for me, but picking a point left or right of center and holding down with the stylus accomplishes the same frequency decrease/increase action and feels more natural. ?I noticed the same action works for the LEVEL output button, at least in the LOW OUTPUT mode.? The action is only applicable for FREQ in the HIGH OUTPUT mode. - Herb |
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Re: New FW: Experimental feature added: value button dragging
Erik,
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For the next (small) version, I was thinking of a rotary encoder similar to the ones used on the old Blackberry phones, pre touchscreen.? ?? ? ? Go for big... What about adding an expansion port that would take either a daughter card or expansion module?? With SPI and RF signals, it would be an experimenters dream.? ?? You build a powerful base unit with a decent sized display and you or others add option boards for demod, control, automated analysis, etc? Of course, power conditioning and noise issues would need to be looked at.? ?? Just some thoughts. Cheers Larry
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Re: New FW: Experimental feature added: value button dragging
Dear Erik,
Maybe I can help a bit with my personal experience of Spectrum Analysers. Many others may have similar stories to tell. I am a retired doctor, but just happen to have a long (since age 10) history of an interest in electronics, sufficient to also pick up a degree in Electrical Sciences during my medical training. A career in electronics was not feasible, so electronics (and computing) remained a hobby, not a career. Many years ago I had a problem driving a transducer to 50mhz from a hf amateur transceiver; just did not work. At the same time, I had built a very primitive Spectrum Analyser (0-100mhz) from a kit of parts. I discovered that the transverter output was full of other frequencies, so I made, and tuned an appropriate band pass filter, using a home made bridge and noise source with the Analyser. Success,! I was working on my own, no colleagues or nearby radio club to help. As a result of this success, I bought an HP 141- based spectrum Analyser, repaired it and used it, eventually buying two more, including the 10ghz plugin. I improved the performance of the basic Analyser I had originally built, as well.? I hardly used much of this kit in anger ( medical career taking up huge majority of my time), but I do know what I can do with a rbw of 100hz. I have a roomful of boatanchor spectrum analysers (6 I think at the last count) all destined for the dustbin now. A tiny handheld device is not as good as the HP machines but at least does not take up bench space or need warming up for 2 hours, and is easier to use. And you can walk around with it to trace qrm (interference). The TinySA will displace all these old machines, even with its current spec. A rbw of 1khz would be nice, as would operation up to 3gkz, so as to play with the obsolescent WiFi kit, for example. I own a Deepace KC901s ( discontinued) handheld - cost $1500 several years ago, and the TinySA does much of what this machine does for $50. Please keep up the good work. Although I was “ spectrum Analyser literate”, I knew little about vna devices until I bought a nanovna. These devices are costing less than a mediocre restaurant meal for two. They will succeed and educate the radio and electronics community. I hope this encourages you all to continue the development of these devices. Stephen Laurence, radio amateur since 1964, doctor since 1975, G7PSZ |
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Re: New FW: Experimental feature added: value button dragging
Narrow RBW isn't a feature that interests me much. If I want to drill down on problems near the carrier, my tool of choice is an SDR that covers the frequency I'm interested in. Receivers like the Airspy HF+ Discovery and SDRplay RSPdx?are great for that. And you can use them as radio receivers when they're not on the bench, making them a good value. More frequency coverage in the low range is another matter; that would be very useful indeed. As it is, the low range doesn't have enough coverage for compliance testing of 2 meter or 1.25 meter equipment. On Fri, Jul 31, 2020 at 12:28 PM Erik Kaashoek <erik@...> wrote: Dale, |
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Re: New FW: Experimental feature added: value button dragging
James Conaway
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Re: New FW: Experimental feature added: value button dragging
Dale,
I used to work in high volume consumer electronics. There we worked with consumer segments. Each different and each very interesting as a market. For a large segment of customers (?roughly 40 to 60% of all customers) for a certain function the only important spec point besides the basic function working is price. For another, value wise large, set of customer the best spec is the most important. In between there is a third group of customers that requires deep understanding of what features they are willing to pay for. As of now I understand how to make a cheap SA that still performs well on its basic functions I have no clue yet on what functions people are willing to pay extra for, except maybe a bit bigger screen but? what else? RBW down to 100Hz? Low range going up to 1GHz (or even 2GHz)? Physical buttons? Better connector? Once the tinySA is being used by many customers I expect them to tell me what the next steps can be and I will keep in mind that each customer is always right, but there are many truth out there. |
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Re: New FW: Experimental feature added: value button dragging
开云体育I do not yet own? the Tiny SA, but am a user of the nanoVNA-F 4.3” screen. Still the device is too small to be as useful as my HP VNA. I think developers too often are most concerned with the price point as opposed to making a more useful piece of test equipment that cost a bit more. Even at? say $150 with a larger screen, larger enclosure, encoder, perhaps a few programmable ?pushbuttons and type N connector, the TinySA would still be 1/10 the cost of other larger machines like Rigol. There is such? a thing as being too small. Just my opinion, ? Dale W4OP ? From: [email protected] [mailto:[email protected]] On Behalf Of Erik Kaashoek ? I like a rotary dial but space and cost may be a problem |
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Re: New FW: Experimental feature added: value button dragging
On Fri, Jul 31, 2020 at 07:41 AM, hwalker wrote:
In my opinion the drag feature would only be worth adding if the user could set the increment of the dragMy use case is when you are trying to tune the frequency of the generator to a yet unknown constant value (like the center of some filter) The amount of inc/decrement is set by the distance from the center of the button so if you start with 10MHz you can take steps between 100kHz (1% increments close to the center) and 20MHZ (200% at the edge of the button) I will try to make the smallest steps even smaller so you can do very fine frequency variations to tune the generator? |
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Re: New FW: Experimental feature added: value button dragging
Not really a space issue as you can get rotary encoders with the same or smaller area footprint as the jog SW.?
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They can either be thruhole or surface mount.? The issue is incremental price.?
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Shirley Dulcey KE1L