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    Archived pages: 745 . Archive date: 2014-08.

  • Title: The Four Metres Website
    Descriptive info: .. The Four Metres Website.. Home.. Operating.. Firsts.. Equipment.. Technical.. Contests.. Photos.. Links.. Forum.. Login Panel.. Username (i.. e.. Callsign):.. Password:.. Remember Me.. Not registered?.. Register now!.. Forgot your password?.. Latest Articles.. New 4 m repeater ON0ABT on air.. German Class A access to 4 m.. Germany sets 4 m free.. Italy back on 4 m.. Montenegro on 4 m (since Apr 2012).. New 70 MHz CEPT Initiative by IARU.. Not yet 4 m in Bulgaria.. Finland expands allocation to include 200.. REF addresses 4 m with regulator.. Another 4 m operation from Sweden.. Previous.. 1.. 2.. 3.. 4.. 5.. 6.. 7.. 16.. 17.. Next.. Web.. 70mhz.. org.. Interested in advertising here?.. Over 3 million ham radio hits a year!.. Published on 14 July 2014 by.. Jean-Jacques ON7EQ.. Last weekend a new 4 m repeater has been activated with call sign ON0ABT on 70.. 3875 MHz, locator JO11PC, output 25 W on 5/8 antenna elevated 55 mASL.. The main purpose of setting up this repeater was to stimulate the activity on the 4m band, by providing a limited 'relay' function for the sparse stations active on this band, and on the other hand provide them a possibility to perform tests an optimization of their station.. Due to the limited bandwidth of the band and the IARU bandplan to which the UBA wants to adhere to, a full duplex was out of question to be achieved - therefore a simplex 'echophone' was provided as alternative.. FM signals modulated with a CTCSS tone of 79.. 7 Hz during at least 3 seconds will be recorded op to 60 seconds, and played back - if the frequency is clear.. After being repeated, the message will be followed by an accurate S-meter report in CW, this can be handly to adjust antenna, check propagation etc.. Every 20 minutes, when the frequency is clear, a beacon will be sent in CW.. As 70.. 3875 MHz is the 'standby' frequency in the Western part of Flanders, probably that signals from across the borders (Southern UK The Netherlands) can reach the locals ham's through the repeater.. Any reception report is mostly welcome!.. Published on 2 July 2014 by.. Bo OZ2M.. Today the.. German BNetzA.. has announced that German radio amateurs holding a Class A license are allowed to use 70,000 MHz to 70,030 MHz until the end of August 2014.. The other operating conditions are similar to those on 50 MHz, i.. 25 W EIRP, max 12 kHz bandwidth and horizontal antennas.. Last year DARC files a petition for 70,0 MHz to 70,2 MHz but this was not granted by BNetzA.. However, DARC will continue to work for a more permanent solution.. Please note: To minimize the interference to/from beacons it might be worthwhile considering if split operation will make sense for sked like QSOs.. Published on 27 June 2014 by.. Until now German operators have had access to 4 m after being granted a special permit.. But from 2 July 2014 the 4 m band should be free to everybody.. according to DARC.. and BNetzA.. However, the access and further  ...   through direct liaison by IARU with the regulators of those CEPT countries which have had some form of access to the band in recent years.. The latter has already commenced.. The document contains an appendix which is intended to be a multi-country and IARU proposal to the Frequency Management Working Group of CEPT which looks after the European Common Allocation (ECA) table.. The proposal is to modify the ECA and footnote EU9.. The support of at least 10 administrations is required to obtain an automatic modification to the table.. The document will be sent for comment and hopefully support to most of the 30 countries having provided some form of access to the 4m band.. In this regard a Spectrum Workshop will be held at Hamradio FHN on Saturday 28th June at 15:00 until 16:00 in - Room A , 5th floor, 'Verwaltungsgebaeude' (Messe Administration Building).. Topics will include presentations on 4 metre CEPT proposals by myself EI3IO and 5 MHz WRC-15 progress by Hans PB2T.. Other topics can also be discussed if time permits.. Because of the short notice of this workshop it will not feature in the Hamradio lecture programme.. Published on 29 May 2014 by.. George LZ1ZP.. 70 MHz band is still not allowed in Bulgaria!.. We are waiting for a "technical permissions" to be given by Bulgarian telecommunication authorities.. Then we will have to wait for a couple of months before this permissions will be publicly discussed and if there are no objections it is to be published in "Official Gazette of Bulgaria".. After that we will start to operate on 70 MHz.. Any previous transmission on 70 MHz can stop this process.. Please don't encourage peoples who are working against Bulgarian radio amateurs - just don't call him!.. Published on 2 April 2014 by.. OZ2M.. Finnish amateurs are now allowed to transmit in the segment from 70,175 MHz to 70,225 MHz also.. This means that the total Finnish allocation is now from 70,0 MHZ to 70,3 MHz.. Published on 1 April 2014 by.. REF of France informes.. that in a recent meeting between the French National Society (REF) and the French National Regulatory Authority (ARCEP), REF raised the issue of access to a number of frequency allocations, including 70 MHz.. ARCEP was informed that 15 European countries had provided access to 70 MHz.. The regulator agreed to review again the possibility of a 70 MHz allocation.. Published on 31 March 2014 by.. I will be doing a presentation about the.. Next Generation Beacons project.. and.. OZ7IGY.. at the.. ESR AGM.. at 12 April next to the.. Grimeton VLF transmitter.. PTS has granted me a permit to perform a live demonstration of 4 m.. The operating frequency is 70,1375 MHz, with a 25 kHz channel spacing and maximum power is 25 W ERP.. See more at VUSHF DX.. 8.. 9.. Site maintained by Stewart GM4AFF, Bo OZ2M and David G4ASR.. Login problems should be reported to.. 70mhz Webmaster.. The views and opinions expressed on this website are those of the authors only.. Website powered by Subdreamer CMS.. Designed by indiqo.. media..

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  • Title: The Four Metres Website
    Descriptive info: OPERATING.. IARU Region 1 bandplan.. Beacon list.. International 70 MHz allocations.. Unidentified Signal Sources on 70 MHz.. Distance records.. The NRRL 70 MHz bandplan for Norway.. The EDR bandplan for Denmark.. Regular net activity on 70 MHz.. Most Wanted VUSHF DX.. A Beginner's Guide to Four Metres.. Published on 20 July 2014 by.. Frequency.. Bandwidth.. Mode.. Usage.. 70.. 000.. 090.. 1000 Hz.. Telegraphy.. MGM.. Coordinated beacons.. 100.. Beacons.. Temporary and personal beacons.. 091 MHz +/- 500 Hz Personal WSPR beacons.. 250.. 2700 Hz.. SSB.. 185 Cross band calling.. 200 CW/SSB calling.. 250 MS calling..  ...   3125 Digital communications.. 325 Digital communications.. 450 FM calling.. 4875 Digital communications.. Beacon List.. Read More.. Published on 13 August 2013 by.. Unidentified Signal Sources on 70 MHz by you!.. 70 MHz Distance Records.. Published on 6 November 2012 by.. Published on 1 June 2012 by.. Ivan OZ7IS.. The EDR bandplan for Denmark from Ivan OZ7IS.. Published on 24 April 2012 by.. Published on 1 February 2012 by.. Most Wanted VUSHF DX including 70 MHz squares and DXCCs.. Published on 26 May 2011 by.. Ross G6GVI.. A Beginner's Guide to Four Metres by Ross G6GVI..

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  • Title: The Four Metres Website
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  • Title: The Four Metres Website
    Descriptive info: EQUIPMENT.. Transverters.. Linear Amplifiers.. 70 MHz Equipment.. Antennas.. Icom IC-E90.. Ascom SE550.. Published on 11 March 2014 by.. Published on 17 January 2014 by.. Published on 27 May 2011 by.. Allan GM4ZUK.. 70MHz Equipment.. Four into one will go! Icom's IC-E90 becomes a quad-bander..

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  • Title: The Four Metres Website
    Descriptive info: TECHNICAL.. 50 W power amplifier by Peter, SP2DMB.. FT-847 modifications by SP2DMB and SP3RNZ.. Diamond D-130N on 4 m.. Microwave Modules MML 144/100 mods for 4 m.. Comparison of commercial 4 m verticals.. 70 MHz low pass filter.. Improvements to the YG5-4 antenna.. 70 MHz Big Wheel.. MMANA analysis of the Trident TA4M4L antenna.. Interfacing Icom HF sets with the Spectrum transverter.. Published on 28 January 2014 by.. Peter, SP2DMB, has made a new.. power amplifier with 50 W amplifier for 4 m.. It uses a Mitsubishi mosfet - RD70HVF1.. Power supply is 13.. 8 V.. Published on 11 October 2013 by.. Greg SP3RNZ.. Part 1.. - description of modules, diagrams, mods and some measurements.. Part 2.. - "howto" do it in practice.. Published on 20 May 2012 by.. Marc PA1O.. Some time ago I have investigated the frequency adjustment of my Diamond discone antenna with the results in the below picture.. Frequency.. [MHz].. 35.. 50.. 75.. 80.. 85.. 90.. 95.. 100.. 105.. 110.. Length.. [mm].. 1270.. 820.. 380.. 310.. 257.. 215.. 185.. 163.. 122.. 82.. Standard there is a top rod with dimensions for 50 MHz operation, but it can easily be tuned up or down across a wide range.. There is a lot of D-130N discones around, and I think the information will be helpful for others who want to use this popular antenna on 4 m!.. Diamond D-130 datasheet.. Published on 6 February 2012 by.. Paul PA0OCD.. Modification at your own risk (yes!) of the Microwave Modules MML144/100 Linear to 70 MHz.. First I tested this (second hand) PA on 144 MHz and on 13.. 8 V it produced max about 60 W! Perhaps the SRF 1397 is not (and never was) up to 100 Watts hi.. This PA 144/100/1/2 is old and has no Preamp, so it can be that later produced PA's have a different PCB Layout.. I modified this 144 MHz PA to 70 MHz using from the “4 Meter Website” both the diagrams and remarks / description (Tnx!) given by SV1DH and GI0GDP.. This modification has now become a kind of mixture.. The result is a a 70 MHz PA which has about 10 dB gain and is up to 50 W reasonable Linear and can produce about max 70 W and 10 A at 13.. 8 V (saturation).. The idle current for the PA transistor on TX is about 250- 300 mA (see potentiometer A).. Using PSK31 to measure the third order IMD I found IMD-3 at -30 dB (good) at about 15 W output on a normal (slow) Watt-meter and about -20 dB at 20 W output.. The SWR at the input is about 1 to 1 when carefully adjusting the 60 pF Trimmers at No.. 2 and No.. Use at the output the 3 coil/2 Doorknob Capacitor Low-pass Filter described by OZ2M or the 3 Coil/ 2 PCB Capacitor Low-pass filter of IK0VAQ.. The Doorknob Filter I made here is up to 100 W easily.. I saw other filter on the 4 Meter website from G4CJZ and GI0GDP as well.. I made two photos of the modified PA with and without numbers at the places of the modifications:There is plenty of room in this PA!.. By the way: Before you start take good pictures of the original PA, I did not hi.. And while most of the radio-amateurs are human, like  ...   1.. 5 amp, by peeling 2/3 windings of.. 6 A: cut the PCB track under the coil at No.. No 6: Coil 2 turn 1.. 3 mm CuAg 8 mm Diameter, long 9 mm.. 7: 60 pF Trimmer Capacitor from PCB track to ground.. 8: just under and beside (left) of No.. 7, a 470 pF SMD 1206 from PCB track to ground or use the removed 470 pF ceramic C.. Leave about 25mm PCB track between Capacitors No.. 7 / 8 and the base of the PA Transistor.. 9: New collector coil 8 Turns 1.. 3 mm CuAg 6.. 5 mm diameter, long 18 mm.. 10: 2 x 100 nF SMD 1206 and 2x 4n7 SMD 1206, 50 volts Capacitors from collector-coil No.. 9 to ground.. No 11a: Cut the PCB track between the two sets of the original silver-mica capacitors (at the collector side of the transistor) and place here coil no 11.. 11: Coil 1 Turn 1.. 3 mm CuAg 1.. 3mm, about 5 mm long.. Leave between the end of Coil 11 and the capacitors at no 12 about 25 mm PCB track and cut it there at 13 A.. 12: 2 x 180 pF brown Silver-mica 500 volt from PCB track to ground.. 13 A: Cut PCB track under coil No.. 13.. 13: Coil of 4 turns 1.. 3 mm CuAg diameter 6.. 5 mm, long about 10 mm.. 14/14 A: Remove.. 14: Small low loss 10 pF Teflon trimmer from coil 13 to ground.. 15 A: cut PCB track under Coil 15.. 15 : Coil 4 turns 1.. 3 mm CuAg Diameter 6.. 5 mm, long 10 mm.. 16 : Small low loss 10 pF Teflon trimmer from coil No.. 15 to ground.. 17a: cut PCB track under 60 pF air-trimmer.. 17 : 60 pF air-trimmer.. 17 B: Originally there is after this coil No.. 17 an 470 pF capacitor place in series with the PCB track.. I removed this one and connected both sides of the PCB track with a piece of wire.. Perhaps this (original) capacitor can stay.. 18: Not (yet ?) solved, is the VSWR shut-down now, never tested it when the PA was still original though for the 2M Band.. Did a short test without a dummy connected at the output, but the shut-down did not work, but the PA is still ok though hi.. at A: Resistor trimmer for the Idle Bias current.. Fully Anti-clockwise first (lowest current without any RF drive) then move the trimmer a bit up clockwise so that there is an increase in current of 250-300 mA (at 13.. 8 V).. at B: Resistor trimmer for the Vox-delay.. Put it at about 2/3 clockwise, Delay is ok then.. When put to much anticlockwise, so with very short delay, I had problems that it would fall off.. sometimes.. Success, it looks a lot of work but it is not!.. Ian Hogan G6TGO.. A comparison of commercial 4m verticals.. Alex IK0VAQ.. A low pass filter for 70MHz by Alex IK0VAQ.. Published on 25 May 2011 by.. Marcel Pertus F5DQK.. Improvements to the YG5-4 antenna by Marcel Pertus F5DQK.. Peter OE5MPL and Rudi OE5VRL.. 70MHz Big Wheel antenna by Peter OE5MPL and Rudi OE5VRL.. Marcel F5DQK.. MMANA analysis of the Trident TA4M4L antenna by Marcel F5DQK.. Alex GD3UMW.. Interfacing Icom HF sets with the Spectrum transverter by Alex GD3UMW..

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  • Title: The Four Metres Website
    Descriptive info: VHF Contests including 70MHz in 2012.. Date.. Time (UTC).. Contest.. Sections.. Notes/Special Rules.. 19 Jan.. 1900 - 2300 CET.. NAC Contest.. 1 point/km + 500 bonus points per WWL.. 31 Jan.. 2000 - 2230.. 70MHz UKAC.. AO, AR, AL, AX.. UK QTH Locator mults.. 16 Feb.. 26 Feb.. 1000 - 1200.. RSGB 70MHz Cumulatives #1.. SF, O.. RSGB Cumulative Contest.. 11 Mar.. RSGB 70MHz Cumulatives #2.. 15 Mar.. 01 Apr.. 0900 - 1200.. RSGB First 70MHz Contest.. 19 Apr.. 13 May.. 70MHz CW Contest.. Postcode and country mults.. 17 May.. 27 May.. 1400 - 1600.. RSGB 70MHz Cumulatives #3.. 29 May.. 21 Jun.. 24 Jun.. RSGB 70MHz Cumulatives #4.. 7 -  ...   31 Jul.. 1000 - 2230.. 12 Aug.. RSGB 70MHz Cumulatives #5.. 16 Aug.. 09 Sep.. 0900 - 1200 local.. RSGB Second 70MHz Contest.. 20 Sep.. 23 Sep.. 1200 - 1600.. Practical Wireless 70MHz Contest.. Low Power, Open.. 1 point/QSO.. QTH locator multipliers.. 18 Oct.. 30 Oct.. 15 Nov.. 20 Dec.. 26 - 29 Dec.. RSGB Christmas Cumulative Contest.. Full details of all RSGB contests, and results of adjudicated events may be found at the.. VHF Contest Committee site.. Nordic Activity Contests on 70 MHz.. The Nordic Activity Contests on 70 MHz run every third Thursday in every month 19-23 Central European Time,.. www.. vushf.. dk.. 275 MHz is the activity centre..

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  • Title: The Four Metres Website
    Descriptive info: Image Gallery.. Sections:.. Images.. 10..

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  • Title: The Four Metres Website
    Descriptive info: 4m Users.. Some people who are QRV on the 4m band.. link(s).. Suppliers.. Suppliers who are known to offer 4m equipment.. 14.. 4m Equipment.. 4m equipment related links.. 20.. Operating on 4m.. These links are primarily concerned with operating..

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  • Title: The 4 m Forum • Index page
    Descriptive info: The 4 m Forum.. The Four Metre Message Centre.. Skip to content.. Advanced search.. Board index.. Change font size.. FAQ.. Register.. Login.. It is currently Sat 2 Aug 2014, 06:50.. View unanswered posts.. View active topics.. Welcome to the 4 m Forum area.. Topics.. Posts.. Last post.. General news, etc.. Use this forum for news, general chit chat and items of general interest to 4 m operators.. 252.. 1710.. by.. G4HTZ.. Sat 26 Jul 2014, 10:31.. Questions and answers.. Don't be afraid to ask any questions pertaining to the 4 m band.. 255.. 1502.. G7RWF.. Thu 24 Jul 2014, 18:40.. Questions and answers on 4 m transceivers, transverters, antennas, etc.. 619.. 3717.. GI0GDP.. Wed 30 Jul 2014, 07:41.. EMC issues.. For discussion of ElectroMagnetic Compatibility and RF interference on 4 m.. 57.. 377.. G3LVP.. Fri 25 Jul 2014, 21:53.. For sale, wanted, etc.. Use this forum to advertise gear related to the 4 m band, etc.. 31.. 49.. G1HHO.. Wed 23 Jul 2014, 09:32.. DX News.. Use this forum for items related to DX, international operations, etc.. 120.. 525.. G0NBD.. Thu 24 Jul 2014, 19:06.. DX Reports.. Reports of interesting DX  ...   Jul 2014, 21:00.. Digital modes.. For discussion of MGM (digimodes) on 4 m, e.. g.. PSK, FSK.. 23.. 147.. HA5CBM.. Fri 28 Mar 2014, 18:35.. History of the 4 m band.. News and views on the 50th anniversary of Four Metres in 2006, and recollections of the band in its early decades.. 12.. 63.. G6ZUV.. Mon 25 Feb 2013, 14:46.. Feedback on Four Metres Website.. Use this forum for comments and suggestions on the site.. 73.. G4IJE.. Tue 18 Mar 2014, 20:21.. Skeds, Operating notifications etc.. A section to post messages about skeds, operation notifications etc.. 118.. 469.. G4ZTR.. Mon 28 Jul 2014, 16:53.. Callsign:.. |.. Log me on automatically each visit.. Who is online.. In total there are.. users online :: 0 registered, 0 hidden and 2 guests (based on users active over the past 5 minutes).. Most users ever online was.. 142.. on Mon 6 May 2013, 16:05.. Registered users: No registered users.. Legend:.. Administrators.. ,.. Global moderators.. Statistics.. Total posts.. 9377.. Total topics.. 1694.. Total members.. 3340.. Our newest member.. DL4ZAB.. The team.. Delete all board cookies.. All times are UTC.. Powered by.. phpBB.. Forum Software phpBB Group..

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  • Title: The 4 m Forum • User Control Panel • Register
    Descriptive info: The 4 m Forum - Registration.. By accessing “The 4 m Forum” (hereinafter “we”, “us”, “our”, “The 4 m Forum”, “http://www.. 70mhz.. org/forum”), you agree to be legally bound by the following terms.. If you do not agree to be legally bound by all of the following terms then please do not access and/or use “The 4 m Forum”.. We may change these at any time and we’ll do our utmost in informing you, though it would be prudent to review this regularly yourself as your continued usage of “The 4 m Forum” after changes mean you agree to be legally bound by these terms as they are updated and/or amended.. Our forums are powered by phpBB (hereinafter “they”, “them”, “their”, “phpBB software”, “www.. phpbb.. com”, “phpBB Group”, “phpBB Teams”) which is a bulletin board solution released under the “.. General Public License.. ” (hereinafter  ...   slanderous, hateful, threatening, sexually-orientated or any other material that may violate any laws be it of your country, the country where “The 4 m Forum” is hosted or International Law.. Doing so may lead to you being immediately and permanently banned, with notification of your Internet Service Provider if deemed required by us.. The IP address of all posts are recorded to aid in enforcing these conditions.. You agree that “The 4 m Forum” have the right to remove, edit, move or close any topic at any time should we see fit.. As a user you agree to any information you have entered to being stored in a database.. While this information will not be disclosed to any third party without your consent, neither “The 4 m Forum” nor phpBB shall be held responsible for any hacking attempt that may lead to the data being compromised..

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  • Title: The 4 m Forum • User Control Panel • Send password
    Descriptive info: Send password.. E-mail address:.. This must be the e-mail address associated with your account.. If you have not changed this via your user control panel then it is the e-mail address you registered your account with..

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  • Archived pages: 745