Viewing profile — tomfanning

> it's rare you hear one that heavy any more With respect, this is nonsense.

In SSB there is no carrier transmitted. Two SSB stations on top of each other sounds exactly like two microphones mixed.

DIY: slim jim, J pole ( https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator... ) or quarter wave ground plane ( https://m0ukd.com/calculators/quarter-wave-ground-plane-ant…

That’s a pretty narrow perspective. From both the perspective of HF and VHF/UHF. For HF there’s all sorts of digital stuff going on. Check out FreeDV for a Codec2-derived digital v…

Speak to a specialist about the Stretta procedure. Application of RF energy to the lower esophageal sphincter in a short outpatient procedure. More effective than PPIs, but less so…

Even ignoring the impedance mismatch, loss in typical 75 ohm coax at 2.4GHz is going to be something like 0.5dB per metre. Far worse again at 5GHz. That's going to add up quickly.

Someone once told me "Friends don't let friends use Fritzing".

An entirely sensible one which prohibits you from preventing an emergency call being made in case of fire, injury, crime etc.

Wheel successfully reinvented :) Nothing stopping you setting up a whole AX.25 network between multiple machines using Dire Wolf [1] and the built-in AX.25 [2] (a derivation of X.2…

It would be better for everyone if this were deleted.

PSA: Pi 4 + M.2 SATA SSD + USB3 adapter is blisteringly fast. No micro SD card needed any more. Runs Ubuntu x64 and Docker. Even better with a heat-dissipating case with an integra…

Who specifically is "their"?

For every engineer on six figures there will be many many of them on five figures. We read about six-figure engineer salaries because people write about them. $100k is well above t…

Yes but. I'm looking right now at a mtr (traceroute) screen from a rural fibre-to-the-premises broadband connection in Lancashire, north-west UK, achieving 2.5ms RTT to Manchester …

Trans-oceanic flights go far beyond the VHF radio horizon to land so routinely use HF radio. It's not a backup, it's the norm. Example: https://www.iaa.ie/air-traffic-management/no…

Isn't this completely standard practice now?

Many of the red areas I see on the map, particularly in France, are fairly obviously where someone's been running a TomTom while on a train or a boat. Of course that's not going ma…

Europe is a continent.

Not over licensed RF links in most countries, unless you publish the private key.

The experience operating sats is very different depending on where you are on the globe. Advice that's okay in one place may be bad advice in a different location. One final heads-…

Fancy-pants cross-band full duplex can be achieved with two £15 Baofeng UV-5Rs and a DIY duplexer with about 2 components on it (or just two antennas on one boom). That's my setup …

A second-hand Kenwood TH-D7 is an alright choice.

Dual watch, or full duplex? My decades-old FT-470 can do true full duplex too, but it's less common in current radios. Just dual watch now.

Kenwood TH-D7

Yes, you absolutely do need true full duplex to (a) know you're getting in, (b) not step on anyone else, (c) know when you're being stepped on, all of which are really required to …