M0BEW -- M4T --

Thursday, 9 August 2018

09/08/2018 144MHz FT8 Activity from PSKR M0BEW

09/08/2018 144MHz FT8 Activity from PSKR M0BEW.

Overall heard.

24H ODX PH0TV.

List.

Tim M0BEW.

Wednesday, 8 August 2018

RSGB 2018 Convention lecture - VHF Baluns: Fact and Fancy

Ian White, GM3SEK.
Our ideas about HF baluns have changed dramatically in recent years. The focus today is very much on suppressing unwanted common-mode RF currents, to reduce both the received noise levels and the risks of causing interference on transmit. Now Ian extends those ideas into the VHF-UHF spectrum, taking a critical look at some long-established methods for feeding Yagi antennas and identifying a new list of Do's and Don'ts for modern conditions.

Tim M0BEW.

Sunday, 5 August 2018

RSGB Convention 2018 lecture - Sporadic E revisited - is it any clearer?

Jim Bacon, G3YLA.
Sporadic E is a complex propagation mode so Jim starts with a review of where we are with current understanding of Sporadic E, ideal for the many newcomers to amateur radio. He develops an easy to use guide for operating during openings, using information readily available for the amateur equipped with internet access. The talk also examines some of the events of the 2018 season to see how our collection of ‘rules’ stand up to the test of real events… or not!

Tim M0BEW.

Saturday, 4 August 2018

04/08/2018 50MHz FT8 Activity from PSKR M0BEW

04/08/2018 50MHz FT8 Activity from PSKR M0BEW.

Overall heard.

Overall M0BEW heard.

Europe heard.

Asia heard.

CA heard.

NA heard.

Uk activity heard.

Tim M0BEW.

Friday, 3 August 2018

50MHz JA Opening to Europe 03/08/18

50MHz JA Opening to Europe 03/08/18.

A nice opening towards to JA / Far East this morning.

Tim M0BEW.

@ M0BEW 5 element 50MHz LFA-VR Yagi (4.35m)

@ M0BEW 5 element 50MHz LFA-VR Yagi (4.35m).

My current 6m antenna here @ M0BEW
Performance, details, construction and comments.

Performance.
Gain: 10.63dBi @ 50.150MHz
F/B: 29.52dB @ 50.150MHz
Peak Gain: 10.68dBi
Peak F/B: 30.02dB
Power Rating: 5kw
SWR: Below 1.1:1 from 50.00MHz to 50.700MHz
Stacking Distance: 3.9-5.1m ( 4.70m recommended)
2 Stacked Gain @ 4.70m spacing: 13.45dBi
2 Stacked F/B: 27.53dB
2 Stacked Gain @ 4.70m Spacing 10m above ground: 18.67dBi
Boom Length: 4.354m
Weight: 4.73Kg / 10.43LB
Turning Radius: 2.667m / 8.78ft
Wind Loading: 0.20 Square Metres / 2.16 Square feet
Wind Survival: 253KPH / 157MPH

Specification.
Named after Kerry G8VR who uses 3 x 5el 50MHz LFA-VR antennas.
Boom is 1.25 inch square aluminum.
12.7mm centre elements and 9.525mm outer elements.
Fully insulated elements.
A direct 50 Ohm feed-point. No matching.
Boom to mast bracket to fit upto 50mm masts.
Marine grade Stainless Steel Fittings.

Construction.

Comments.
I have used this antenna now for around a month and feel very happy with the performance.
I choose this particular boom length as a trade off between gain and beamwidth for general use.
For this purpose it's perfect.

Tim M0BEW.