NOTICES
________________________________________________________________________Sound Mirror Visit Denge!!!!
Anyone interested in having a club visit to the Sound Mirrors at Denge? contact Karl Davies on 01227 710120 or email karl.davies@talk21.com.
Further information.....
see the website: http://www.rmcp.co.uk/NoticeBoard.php
SUMMER 2010 VISITS TO THE SOUND MIRRORS - OPEN DAY
The concrete structures at Denge are the remains of part of an
acoustic early warning system, designed to detect engine sounds from
approaching aircraft. They are known as 'Sound Mirrors' and were
constructed in the years 1928-1930. The Denge mirrors were part of an
intended chain defending the South East. At Lade Pits, on the island are
a 20ft mirror, a 30ft mirror and a 200ft wall.The Sound Mirrors are
Scheduled Ancient Monuments and English Heritage commissioned repairs
and improved access in 2004 to safeguard these structures.
The sound mirrors are only accessible on one of our guided tours and we
have been leading free tours out to the Sound Mirrors for 13 years now.
They are on an island, connected by a locked swing bridge on a private
gravel workings (owned by CEMEX).
There will be an 'Echoes from the sky' open day on the 18th of July from 10:00am - 4:00pm. The Open Day is free of charge and there is no need to book, although we do ask for a donation. For the open day only you will need to park at Lade car park and follow the signs to make your own way to the Mirrors. Staff and volunteers will be stationed at key places to help direct people and will be positioned at the bridge and on the island.
For more information, please see the activity list below or please
contact us if needed:
Tel: 01797 367934
Fax: 01797 367934
Hilderstone Radio & Electronics Club
Invite you to join us for our Annual Field day
This could be our finest WOK!
From 11am on Saturday 7th August 2010
at the
Westgate-on-Sea Community Centre field.
Barbecue and refreshments! Free tea and coffee!
Free Admission and Car Parking but Donations encouraged!
Something to sell? Bring it along.
But please take away unsold items when you leave.
Listen on all bands for G0HRS
Talk-in on GB3EK and
GB3KS
Meet up with friends old & new
Amateur Radio data mode ROS proving popular
Although it's only 3 months since the first HF contact with the new Amateur Radio data mode ROS, it's proving popular with plenty of activity on 14.101 MHz.
ROS is a digital spread spectrum mode but with a narrow total occupied bandwidth of about 2.2 kHz. The software has two Symbol Rates: 16 and 1 baud (the latter aimed at weak signals down to -35 dbs of S/N) and can automatically synchronize any Symbol Rate.
Initial reports talk of it being able to copy signals so weak that they don't show up on the Waterfall and there are early indications that it is several dB better than Olivia. However, HF with its Fading, Doppler, Multi-Path and Interference is a hazardous environment for digital signals and only time will tell how well it performs against the other modes.
One issue the mode has thrown up is the restrictive Amateur Radio License conditions in the USA. Here in the UK we are used to the "Technology Neutral" approach adopted by our regulator Ofcom. This permits us to devise and use any mode we like with any bandwidth as long as the transmission fits within the Amateur band.
The United States is not so fortunate, there the FCC specifies which modes Amateurs can use and where. Some Amateurs in the States are concerned that FCC regulations appears to prohibit the use of Spread Spectrum below 420 MHz and ROS is a Spread Spectrum mode.
To be fair to the FCC they did try back in 1977 to change from a mode based band plan to one based on bandwidth. At the time the ARRL opposed the change and was successful in defeating it, as a result the development of digital modes was crippled for decades to follow.
In recent years the ARRL has been trying to get the FCC to re-introduce band planning by bandwidth and hopefully they will be successful.
You can
download ROS from
http://rosmodem.wordpress.com/
________________________________________________________________________Icom has moved!!!
see Adobe pdf files below:
icom_letter
icom_uk_on_the_move
__________________________________________________________________________
Posted: 12 December 2009
Wanted: 4m Tranceiver
Ted G3ISD Tel: 01795 477431
__________________________________________________________________
Wanted
Plessey IC's Sl1612 Sl1621 Sl1640 Sl1627 Sl6270
Contact David G8URC
01227 368803
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