Recent content by davenn

The sun for 9th and 12th of May 2024. Canon 6D MKII, 800mm, F11, 125th sec, ISO400, white light solar filter Have been battling crap ( very wet) weather over the last week in Sydney Trying to see/image the sun has been almost impossible

just use 50 Ohm coax, you shouldnt be using 75 Ohm anyway you are using a 4 : 1 BALUN .... at most the feedpoint is only going to be around 200 Ohms, not 300 Ohms a folded dipoler on it's own has a 300 Ohm feedpoint, but once put into a yagi with other elements, the feedpoint impedance is...

ohhh totally agree, I deal with this daily on various facebook meteorite collector groups yup all meteorites are not magnetic ... specifically the achontrite group into which fall pretty much all the Lunar and Martian ones, as well as the H.E.D. group They really hate being told that their...

Love my NanoVNA, had it for a year now makes tuning up antennas a breeze. It's rated to 4GHz Also have a TinySA Ultra ( Spec Analyser) rated to 6GHz, still helpful at 10GHz to show signals just not an accurate signal level wish these were around in years gone bye when I was doing much more...

for sure gosh, it's been years since i last did that i have been reinspired tp decap a few more chips :smile::smile:

Engineers joke!😄🛠️ A priest, a doctor, and an engineer were waiting one morning for a particularly slow group of golfers. The engineer fumed, 'What's with those blokes? We must have been waiting for fifteen minutes!' The doctor chimed in, 'I don't know, but I've never seen such inept golf!'...

definitely not a Pallasite, mesosiderite or any other type of meteorite Most likely a metallic ore ( composition unknown without closer study) or it's slag, and going by the bubble holes on it, I am aiming towards slag Dave

The ground point is irrelevent - have it there, remove it, the voltage isnt going to change why isnt it 10V .... because the voltmeter ISNT directly across the battery - and that is the ONLY place you will measure 10V difference I assume you meant point "P" not "B" as there is no "B" again...

then you misunderstand depth of field I agree with Andy, having done photography for more years than I can to remember. Depth of field and depth of focus are essentially the same thing, and the guy's comments in the video are correct when stating that the sensor size is irrelevant. Dave

yeah, still very close to the horizon here in Australia. I have seen/photo'ed it a couple of times but very difficult in the twilight this was for the 22 April that I posted on social media ..... TONITE'S "BEST OF THE BUNCH" PHOTO OF COMET 12P/PONS-BROOKS Canon 6DII, 200mm, f2.8, 10 sec, ISO160...

hi there and welcome to PF :smile: I dont claim to be an expert in the subject, but I am very passionate about solar activity and it's effects on the Earths atmosphere my thread of solar activity stuff...