开云体育

Just received my tinySA - it's on charge at the moment.
A new noise has showed it's ugly head a few weeks ago at my QTH.
A wide pulsing burst occurring about every 1-2 seconds at S7 !!
And swamps? about from 3 MHz to 14 Mhz
How can I use the tinySA to try to identify/locate what it is?
Any help, ideas, instructions wold be very welcome..
--
Dave KK7SS

DN06ij

You have an excellent tool to trace it.

Set the span to scan ( some of) the interference frequencies, eg 3-14mhz.

Put the telescopic aerial on the lower sma socket.

Extend the aerial and see the noise spikes on the screen, then walk around the house/ garden/ street, observing the amplitude of the noise spikes. ?As you get nearer and the spikes get larger, collapse the aerial down a bit. Eventually you might get to within a few feet.

I identified a switch mode psu in the house which powered an electric reclining chair within minutes this way - one if the first uses of the device. It is possible to use handheld directional aerials ( or a mw ferrite rod aerial from sn old aerial) so that you can triagulate the source if distantly generated noise.

On the wiki for the SA, you will find info on using an external lna (low noise amplifier) to increase sensitivity so as to be able to detect more distant noise sources. I am in the process of making one, which I will probably velcro to the sa case.

Steve L. G7PSZ

Steve--
Did you sell the ham gear or the reclining chair??? Inquiring minds would like to know...

Hmmm, a difficult question to answer.

It is in the (relatively) new wife’s house, where I do not have any of my ham gear (I wonder why?). I did bring up a Clansman 320 backpack radio (40 year old hf military transceiver) a while ago but could not receive anything. I presumed it was the solar panels or the data over phone line, as it worked fine in the middle of a field. I did not have the TinySA then (or the nanovna, which can be used as a sort of spectrum analyzer).
Eventually we will move into my house, but probably without the reclining chair but with the Mrs (more use than a reclining chair, but more expensive to run). The problem is that the PSU is on the whole time (for the chair, not the Mrs, although installing an on-off switch, or at least a mute button is an interesting project to work on).

Steve L. G7PSZ