Search found 1246 matches

by daveB
13 Dec 2018 20:44
Forum: VHF Band 2, OIRT & DAB
Topic: Notch filter for 92.3 MHz?
Replies: 2
Views: 173

Re: Notch filter for 92.3 MHz?

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...
by daveB
10 Dec 2018 22:57
Forum: Off Channel
Topic: Bread-board circuit construction any one?
Replies: 6
Views: 306

Re: Bread-board circuit construction any one?

Yes - they were available. I don't think the one I had was from Tandy back in the 70's.
by daveB
10 Dec 2018 15:30
Forum: Off Channel
Topic: Bread-board circuit construction any one?
Replies: 6
Views: 306

Bread-board circuit construction any one?

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 ...
by daveB
07 Dec 2018 13:34
Forum: Television
Topic: RUS Analogue TV Shutdown Started
Replies: 4
Views: 203

Re: RUS Analogue TV Shutdown Started

So is there any indication of how long will FM broadcasts last on the OIRT band???
by daveB
26 Nov 2018 20:54
Forum: Off Channel
Topic: General Purpose PC in sale
Replies: 0
Views: 87

General Purpose PC in sale

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-...
by daveB
14 Nov 2018 15:32
Forum: DX Alerts
Topic: Possible tropo over the weekend
Replies: 10
Views: 315

Re: Possible tropo over the weekend

Getting Luxembourg with RDS and Lille at 0% ber RDS. It looks promising for the next few days so I have turned on the 24/7 monitoring set up.
by daveB
10 Nov 2018 21:26
Forum: EMC (Interference) Issues
Topic: Medium Wave Coaxial choke
Replies: 12
Views: 558

Medium Wave Coaxial choke

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...
by daveB
08 Nov 2018 11:43
Forum: Medium Wave & Long Wave
Topic: Conditions 07/11
Replies: 45
Views: 831

Re: Conditions 07/11

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...
by daveB
02 Nov 2018 11:15
Forum: Medium Wave & Long Wave
Topic: Early TA DX
Replies: 3
Views: 154

Re: Early TA DX

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...
by daveB
01 Nov 2018 21:11
Forum: Medium Wave & Long Wave
Topic: Early TA DX
Replies: 3
Views: 154

Early TA DX

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...
by daveB
30 Oct 2018 22:14
Forum: Logbook
Topic: The Canadian Prairie morning, Miss Maud
Replies: 8
Views: 393

Re: The Canadian Prairie morning, Miss Maud

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...
by daveB
30 Oct 2018 17:46
Forum: Logbook
Topic: The Canadian Prairie morning, Miss Maud
Replies: 8
Views: 393

Re: The Canadian Prairie morning, Miss Maud

Boo hoo - suffering severe band-wide QRN
by daveB
29 Oct 2018 20:28
Forum: Antennas
Topic: Wideband shielded loop antenna project
Replies: 3
Views: 924

Re: Wideband shielded loop antenna project

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...
by daveB
25 Oct 2018 19:26
Forum: DX Alerts
Topic: Swiss Tropo
Replies: 11
Views: 460

Re: Swiss Tropo

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...
by daveB
25 Oct 2018 10:40
Forum: DX Alerts
Topic: Swiss Tropo
Replies: 11
Views: 460

Swiss Tropo

I've just received Santis - La Premiere on 99.9 and reasonable strength.

David
by daveB
23 Oct 2018 13:22
Forum: DX Alerts
Topic: Tropo 23/10/18
Replies: 12
Views: 476

Re: Tropo 23/10/18

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),...
by daveB
20 Oct 2018 11:10
Forum: SDRs
Topic: SDR# 1361 plugins needed
Replies: 4
Views: 383

Re: SDR# 1361 plugins needed

I've tried a 2nd time - the original message did send a copy to my e-mail address, so why it didn't get to you I don't know.
by daveB
19 Oct 2018 17:52
Forum: SDRs
Topic: SDR# 1361 plugins needed
Replies: 4
Views: 383

Re: SDR# 1361 plugins needed

PM sent
by daveB
10 Oct 2018 11:09
Forum: DX Alerts
Topic: TROP>DENMARK
Replies: 5
Views: 275

Re: TROP>DENMARK

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...

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