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New SV1FOUR beacon
Published on 26 April 2007 by SV1DH
Since 24-Apr-2007 SV1FOUR beacon from Athens is licensed on 70.040 MHz at 5W RF to 5-ele yagi (~8dBd, -3dB & 50 deg az) beaming 315 deg (centered for UK). At the moment is running at ~1W RF, mode is CW (callsign followed by several dashes) and loc. KM27AW. Keeper SV1DH.

No 70 MHz in the Netherlands
Published on 10 February 2007 by PA2V

This week the Dutch AT authorities had a meeting with the VERON and VRZA (both represent the radio amateurs in the Netherlands).

The Dutch Telecom (AT) investigated the possibilities with the military service that still occupies parts of the 70 MHz spectrum. AT stated that the military service do not allow ham radio in their spectrum, so the AT is not able to give any permits to the Dutch ham community. They will not put this issue on the agenda so long as there are no other circumstances to do so.

I guess it will be an understatement to say that the Dutch ham community is very disappointed. 73, Peter PA2V

4 m modification kits for FT-847
Published on 10 February 2007 by G4FUF

FT847 owners are probably already familar with Keith G4FUF's article on modifications for this radio for use on 4 m, published elsewhere on this website.

Keith advises that the first fifty of his pre-amp kits have now been shipped and he is expecting the next batch of PCBs this week.
He is still unable to offer a complete assembled pre-amp as the labour would be excessive given the quantities anticipated, however if you have special needs, please contact him by email.

The ordering information and contact details are given in the article referenced above.

Keith is developing a second kit which adds a small switched 70 MHz BPF/Amp PCB at the TX output of the RF-UNIT at J3004. This addresses the very poor spurii from non-UK models in the TX range 54-76 MHz when used on 70 MHz. Please contact Keith if you have a non-C2 model and are interested in this item, which is expected to cost under £30.

4 m PA design feature
Published on 26 January 2007 by G6GVI

As promised, Geoff GI0GDP has provided full details of his design for a simple solid-state linear amplifier for 70 MHz.

This can be viewed in the Technical Features section, along with a number of other articles on antennas and transmitter equipment.

GB3CFG interruption in service
Published on 15 January 2007 by G6GVI

GB3CFG has been off-air since the start of the year due to problems with the mains supply.

Please do not adjust your sets!

Four Metres Site Ten Years Old!
Published on 22 December 2006 by gm4aff

Yes, incredible but true! The Four Metres Website is 10 years old on the 27 Dec!


Conversion of old multimodes to 4m
Published on 14 December 2006 by admin

The Equipment section of the 4m Forum contains some notes on the conversion of old 2m multimodes such as the FT221, TS700 and FT225 into dedicated 4m transceivers:

FM telephony channels
Published on 13 December 2006 by Nige-G7CNF

The last four years have seen a large influx of new users on 4m FM, but the present bandplan prescribes ten channelised frequencies to 'digital modes' and only five for telephony.
As we move into the new solar cycle, the Es season will bring more activity on 4m FM: will five channels be enough?

A new Topic (with an online poll) has been started in the Digital modes Forum:
Please take a look at the thread and cast your vote.

David G4ASR, the RSGB VHF Manager, will be pleased to receive constructive comments and suggestions on this matter.

The history of the Four Metre Band
Published on 11 December 2006 by Stewart G1HHO
In the January edition of Practical Wireless there is a interesting article by David Butler G4ASR on the history of the 4 metre band.

New feature on FT-847
Published on 14 November 2006 by G6GVI
A new feature article provided by Nige G7CNF has been added to the Technical Articles section:

This includes some detailed measurements on an FT847 operating on 4 m, and suggests a modification to reduce the high-level spurious signals found.

More recent information indicates that the UK "C-2" versions do not suffer from these problems: