Search found 1246 matches
- 13 Dec 2018 20:44
- Forum: VHF Band 2, OIRT & DAB
- Topic: Notch filter for 92.3 MHz?
- Replies: 2
- Views: 173
If you are going to build an expensive aerial system it might be better to purchase a filter. It would cost less than making one, especially if you consider the time involved.Check out the web-site www.tinlee.com. This filter looks to be what you need http://www.tinlee.com/PDF/VR7-instu-page-LC-7-14...
- 10 Dec 2018 15:30
- Forum: Off Channel
- Topic: Bread-board circuit construction any one?
- Replies: 6
- Views: 306
I was amused - a whole new meaning to using a bread board for circuit construction. [Note for the young - in the early days of wireless circuits were literally built onto a wooden board with all the components screwed down to the board and joined by wires. Hence "bread board" as the kitchen was the ...
- 07 Dec 2018 13:23
- Forum: Television
- Topic: Moldavian tv to complete transition from analogic to digital in early 2020
- Replies: 2
- Views: 131
The 2nd nd 3rd links flag up as "Harmful Web-site"
I found the following PC on offer from Currys/PCWorld for £419.00 sale price Acer XC-885 Intel i5-8400. 8GB RAM/1TB hard drive - with wireless keyboard and mouse. It has a 220W PSU. The cpubenchmark for the cpu is 11671. Just on 4 years ago I bought a Packard Bell with similar specs- but with an 15-...
- 10 Nov 2018 21:26
- Forum: EMC (Interference) Issues
- Topic: Medium Wave Coaxial choke
- Replies: 12
- Views: 558
Quite by accident I have come across a wave to possibly suppress MW interference picked up on the braid of the coax. As posted previously the endless 62.5 kHz QRM centred on the MW band is noe premanently resident. I decided to move the Loop aerial to anther spot in the garden. To do that I needed t...
From the published designs for MW flags a 16:1 balun is closer to the desired value. There is an image for a flag were the balun turns are 48/11 - which is a 19:1 ratio. If the intention of the design is that the coax cable impedance is matched to the value of the terminating resistor then the 48/11...
Hi John, My garden is too cluttered to put up a flag antenna. My problem isn't electrical noise but is something leaking RF centred a little above 1 MHz. A shielded magnetic loop is supposed to be a low noise antenna - and compared to the other aerial I use for HF (a rubbish one) the pops and clicks...
Smooth music on 590 at 2055 UTC plus a carrier on 570 - slightly too weak to get audio. Also something US/CAN english on 710 at 2100. Presumably these are stations close to the night time terminator. Unfortunately above around 800 kHz the interference is too strong for weaker signals. The recordings...
- 30 Oct 2018 22:14
- Forum: Logbook
- Topic: The Canadian Prairie morning, Miss Maud
- Replies: 8
- Views: 393
Interference still very bad - but less so at the bottom of the band. Just before 2200 and through to now I'm getting a carrier on 590 with american english coming through now and then and 'smooth' music. It doesn't match VOCM web stream or WEZE or CJCL. A carrier on 570 is slowly growing in strength...
- 29 Oct 2018 20:28
- Forum: Antennas
- Topic: Wideband shielded loop antenna project
- Replies: 3
- Views: 924
UPDATE: I have finally constructed the balanced pre-amplifier using MPSH10G transistors as per the Fig 22 this article: https://www.george-smart.co.uk/wordpress/wp-content/uploads/2017/02/EWS-Article-in-MW-News.pdf The most difficult thing was the winding of the tri-filiar transformer for the output...
Between 1715 and 1730 UK time I've logged all the transmitters from Wendelstein at 909 km. The signals were weak between O=1 and O=2. If you look at the propagation maps you can see that the the signal path (and for the Swiss reception) is along the boundary of enhancement. No sign of Austria -(so f...
There was a very nice opening deep into Germany this morning. It started around 0645 UTC and faded out around 1000 UTC. Best DX was Ochsenkopf on 107.1 at 791 km. Then at 725 km a couple of txs from Sonneberg/Bleßberg, along with stations from Brocken (682 km), Inselberg (679 km), Torfhaus (677 km),...
Well John - I didn't get anything from Poland whilst Denmark peaked very strongly for a relatively short period of time here. A DXer 6 miles to the west of me logged Sweden at around the same time - but nothing heard here - not least because the lower end of the band was affected by a local iTrip wh...