Sunday, 15 January 2017

#6 Poundland Power Bank

Not a lot of activity to report on 145.500 so far this week, recorded all Thursday 12th and not a single CQ call from 6am - 10pm.
Saturday 14th wasn't much better, between 9am and about 3:30pm there was one single station - G6ZET in the Lancaster area.
Sunday 15th was slightly better, with G8INU and 2E0DVV calling. But this weekend not a single portable station, must have been the weather.

Not long ago I was in the local Poundland and spotted some rechargeable USB power banks.
Sold as 1200mAh (4.44Wh). When I tested this from full, charging a tablet, it ran for about 70mAh at 5v output then gave up. Tried on a lower current load, with some LEDs and it ran for a total of 170mAh (850mWh). Even with any conversion losses, there was no way the cell inside was 1200mAh (a proper cell of that size would be rated around 2200mAh). 
I'd avoid any power bank of that design, or anything battery based from a pound shop.

Wednesday, 11 January 2017

YouTube Channels

A couple of good YouTube channels I subscribe to, with all kinds of amateur radio/drone/e-bike type stuff

Andy Kirby

Distant Signal

Monday, 9 January 2017

Activity 8th Jan

CQ calls heard on 145.500, at home, Sunday 8/1/17 (the whole day apart from when I was using the radio):
GM3VMB - Annan
The area round Gretna and Annan is a good VHF path for me, over just the highest points of the Lake District fells.
M6VMS/P on SOTA G/LD-018 Stony Cove Pike
2E0DVV - Ulverston
G8INU - Blackpool area
G8BEK - Burnley
I also do quite well towards Burnley, Walney Island being as far back as possible from the Forest Of Bowland probably helps.

Saturday, 7 January 2017

Today's S20 activity

People calling CQ on 145.500 today, on my recording made at home between about 9:30am and 4pm:
  • M0BKQ/P on Whernside (SOTA G/NP-004)
  • M0KCB/P - no summit references given but the first call was for both SOTA and WOTA so looking at the WOTA website, shows an activation of Gummers How (LDO-067) in the morning. A later call was "CQ WOTA" only, so probably Staveley Fell, (LDO-084).
  • G8INU (Blackpool area)
  • Some stations calling others
 Other stations heard
  • 2E0MVH calling through GB3MP 145.750 - spoke to Sean on the repeater (it's a while since I've been on MP!)

I spoke to M0BKQ/P while I was out in the car this morning, first SOTA chaser QSO and first voice QSO of 2017.

If you do put a call out on 145.500 at the weekend, even if you don't get any replies, there's a good chance I'll have heard you if you're within VHF range. Weekdays I usually run the APRS gateway instead. I'm going to try and post as many reception reports as I can from the calling channel, if I'm recording or not able to get back to someone.

Friday, 6 January 2017

#2 Homeplugs

Bought a set of TP-Link TL-PA4010 Homeplug power line network adaptors a few weeks ago. I'm not usually a fan of these things as they use radio frequencies that get radiated by the mains wiring but at the moment I've nothing for the HF bands so it doesn't matter. They were also under £20 for a pack of 2.
They are supposed to be 500 Megabit but as they only have 100 Meg ethernet to connect to anything, that's a meaningless figure, even if they could manage that in ideal conditions. Anyway I set them up by doing the usual button push and they worked as well as the Wi-Fi from router to the bridge I use to connect my main PC wirelessly, with our FTTC broadband.
If they aren't 500 Mbit/s, then how fast are they in real life? I did a test with them, compared with Wi-Fi over the same distance.
For the test, I moved my D-Link DNS-320 downstairs to the living room. It's usually plugged into a gigabit switch next to my main PC. The 'fibre' modem and Wi-Fi router (Plusnet branded Technicolor TG582N) are under the TV in the living room. This is a 2.4GHz only device, with no external antennas and 4 100 Meg ethernet ports. 

Wi-Fi test
 I plugged the DNS-320 into an unused port on the router. I set my Wi-Fi bridge up again that I had been using before I got the Powerline kit, and the main PC was connected through a gigabit switch to this. Usually I power the bridge through the DNS-320's front USB port but the iPhone charger is powering it now.
I copied a 3GB file from the NAS (mapped as a drive letter in Windows 10) to the local disk. Here is a graph of the transfer

Even though the Wi-Fi kit was capable of 'N' speeds, the connection was only being made at 54Mb/s. The maximum speed just hit 40Mb/s, which is about 4.5MB/s of file transfer. This is barely good enough to make full use of my internet connection (paying for 38Mb/s but the line can do at least 65Mbps). 

Powerline Test
For this, I plugged the DNS-320 straight into the Powerline adaptor downstairs (it has a static IP address) and the upstairs Powerline into the gigabit switch.

Both devices were on the same ring circuit (House Sockets) - there is a second ring circuit for Kitchen Sockets, which might affect the speed as there is extra cable and circuit breakers to go through but these are the most typical places you would plug in powerline adaptors.

Powerline beat W-Fi by 75% over the same distance, copying the same 3GB file. 
It was also a more stable connection, giving over 7.5MB/s of file transfer. 

The interference given out by these on HF affects mostly those frequencies outside of the amateur bands, as amateur radio frequencies are notched out, with about 50KHz guard band at the edges. On other frequencies though, there is a lot of noise from them, which even on a portable radio can be heard out in the street. When they are idle, the noise is a bit like car ignition noise (very short pulses which may be caught by the radio's noise blanker), but as soon as any data is transferred, the noise becomes continuous. Below 27.95MHz there isn't any limiting of interference to the CB channels.

What would you need them for?
For most people using Wi-Fi devices around the house on the internet, not very much. I don't like Wi-Fi on desktop PCs, as any antenna is going to be round the back, between a metal case and a wall, surrounded by a load of cables (or it's going to be inside a metal case). It's also another thing to install and take up a USB port if it's a USB adaptor. If you have some kind of file server on the network, it's good to have it wired to at least one PC/Mac to get stuff onto there quickly. That's when you would have a permanent link back to wherever the internet and Wi-Fi was coming from - ideally wired but powerline or Wi-Fi bridge if that's not possible. 
But if you live anywhere near me then absolutely DO NOT buy them (or get Sky Q)!

The network in the home is actually the bottleneck now in most areas - it can be faster to download even a big file from the internet than to transfer it over Wi-Fi between two devices in the same house (everything has to be transmitted up to the access point then back down). 

Sunday, 1 January 2017

#1 of 2017

Well here's the first post of 2017. Yesterday my Baofeng GT-3 mk2 handheld arrived. Still need to set up the memories properly - it's recognised as a UV5R in CHIRP but different firmware so other Baofeng images don't work with it.
The programming software mini CD that came with it couldn't be read by 2 different CD drives but it's easy enough to get online or just use CHIRP.

Wednesday, 28 December 2016

New Camera

For Christmas, I got a new camera, a Canon SX410, which replaces my Panasonic Lumix FZ38.
Slightly smaller but with 40x optical zoom instead of 18x. I've had the FZ38 for over 7 years now, and before that I had a Konica Minolta Z2.
For the last 4 years the FZ38 has had a bit of dust inside the lens which could be seen on photos when using high zoom levels.

SX410 with the distant houses around 4km away

FZ38 with dust inside lens

Yesterday I managed to lose some pictures off the SD card, half way through copying them onto the PC, Windows said the card wasn't formatted and even after using Photorec, only about half of them could be recovered. Note to self: that's what the write protect switch is for on the card (not that I've ever used it).

I've ordered a Baofeng GT-3 (Mk 2) dualbandheld after selling the Alinco DJ-G7 triple bander. A bit of a downgrade, I know, going from a £300 to a £30 radio but lately I've not been making much use of the handheld radios, especially not on 23cm. I decided not to go for the cheapest Baofeng dual band radio, after reading reviews of the GT-3 which said there was some difference in performance.
I've also ordered a new battery for my DMR handheld (MD-380 clone) so I can use it portable again and not just rely on the battery eliminator.

One of my goals for 2017 is to make more blog posts, at least one every week if possible, even if they might not all be radio related (if not then they will probably be electronics themed).