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powabeam antennas g6hks vhf/uhf bands yagi kits & parts powabeam home build contact designs ldmos offers parts pics videos powabeam antennas g6hks vhf/uhf bands yagi kits & parts visitors online: total today: updated 25th april 2018... a warm welcome from richard g6hks - some of you may know me, i am a keen all mode vhf and upwards dxer but like many i have a less than perfect radio location – this has obliged me to optimise my station to the best of my ability – to this end i became a fan of dereks powabeam designs which are in my opinion the closest to perfection yagi designs – period. for example look at the antenna temperature of the waxxx10s compared to its competitors in the famous ve7bqh antenna tables , antenna temperature provides a good overall performance indicator and at 225 degrees kelvin is simply 'best in class'! in 2014/15 derek undertook some ground breaking work - q-factor analysis that calculates a figure of merit score against a designs all weather stability potential. all our designs take this work into account and are all weather performers – you wont miss any dx due to your yagi going off-tune (really quiet on receive sometimes confused with low noise performance!) or your pa protection tripping out due to high vswr. the heaviest rain or dew makes negligible impact (see g6hks wet weather test ). my goal is simply to make it as easy as possible for radio amateurs to construct their powabeam – whether it be for a local rag chew or some serious dx'ing. to this end i am happy to offer complete or part material kits which enable you to construct a powabeam design of your choice at a really competitive price and of course the added enjoyment of making your own antenna which really works. for 144 and upwards my choice is 4.76mm (or 5mm) parasitic elements combined with a 5/8ths (or 16mm) diameter co-axial driven element (using the unique paraclip solution and driven element rf transparent mouldings). the result is a really good looking low profile antenna handy for those winter storms. for 4 and 6 metres we move up to half inch two-piece parasitics with a 7/8th oversleeve centre joiner onto 2 bolt stauff clamps – being quite acceptable at these lower frequencies (see parts tab and kit proces for more details and feel free to contact me with any bespoke requests). i am also a big fan of ldmos sspa's and the benefits of ‘instant on’ capability which is great for those fleeting e's qso's while others are still warming their tubes (or face running a large noisy amplifier on standby all day ) plus of course the far better efficiency – 70% at 144 for example. check out the ldmos tab which is a photo file of my 432 500w pa project now completed and providing me with many eme contacts – about 350 watts make it into my new 4 x 18ele ws718562 's which provide a useful +1db compared to my previous 4 x 18ele cqm18uc low q eme array which are now under new ownership– work on a w6pql twin ldmos keeps getting deferred to other projects although i hope to get this finished in 2018, a new vhf designs 20db/0.4 db nf lna has made a significant difference compared to my previous 16db / 0.8 unit. 2017 general activity observations: for me 2017 was an improvement to 2016, given my limited availability i was lucky to catch 4 es openings on 144 including qsos with ik7lmx, sp8wjw, uw8sm, y05ohy, y08tk, us5rcw and ut9ur, no mega tropo openings caught. my real focus was 432 eme and starting to put a 1296 station together. 2017 432 eme observations: 432 eme has become my main pastime allowing me to continue optimising my mini station comprising the incredible ws718562 21dbd low noise array giving me qsos with 2 yagi 500w stations, this year ive heard a few single yagi stations however no qso completed yet fingers so lets hope 2018 is the year. as mentioned above a new vhf designs lna has made a noticeable difference with an extra 3dbs of usable gain and reducing my noise figure by another 0.4 of a db, using a trilithics notched attenuator i am getting about 10dbs of sunnoise but havent had the opportunity to check the level with the new lna. own echoes typically –24 area (350watts at the powersplitter feedpoint) and significantly better during the recent dec supermoon. i am not able to disconnect the agc on my ft847 nevertheless best signal strengths leaders observed in 2017 were hb9q -5, nc1i -5, dl7apv -6. check out my various youtube of some eme signals including from frank nc1i on 432 moving the s-meter several bars. activity on 432 continues to improve especially during contests where there are plenty of signals about with the occasional appearance of some astronomy dishes ‘temporarily’ adapted for 432. great qsos in 2016 include another with allan vk4eme –22 (-13 for me !!), i5cte, fr5dn (several qsos we seem to have a direct line always good signal for 4x21s), ea9lz (new dxcc excellent dxpedition by zdenek), sm7ths, early 2018 432mhz eme update: upgrading to the vhf design lna has made a significant difference to my receive capability, i had felt for some time the array could cope with another 3-4dbs of gain and the lower noise factor being an additional bonus. if you check my sun-noise video on youtube you can see for yourself how good the system performs, plus check out the echo test image under good conditions with my own echos visible down to 30 watts at the power splitter! ive recently completed 2 qsos with single yagi stations (ok1teh was –22 ! and ur3ee –27 both single yagis with admittedly 700 watts+ to hand) ea8/g4rgk was a solid –26 using a single 21ele tonna but only one way this time. other notable recent qsos include eb5eeo –21, 4z5cp -27, s51lf –20, w5lua –15, jh7opt –18, ua4aav –20, nc1i –6 (thats up to almost s3 on the ft847 truly amazing). resources for constructors: sdr capability is like being blind and given sight – with a decent antenna it takes away the reliance for spotting sites (although these remain great resources). during e's it gets you to the dx quickly. if you dont have a commercial sdr set up using a g4hup pat board allows you to take an if tap into a dongle of your choice (i use the pro-plus) getting into ldmos sspa's construction check out rfham and w6pql sites. personally jim w6pqls website and kits are outstanding – i was originally drawn to jims site needing an effective sequencer – his kits are great and the sequencer is a good starter kit for those new to smd construction. jim also has many useful video clips to help you. i opted to get the heatsink from rfham for my single 432 ldmos but have used kuehne electronics for the twin and they have some great options, italabs also similar – take your pick. ancilliary stuff from ebay, rs components. if needed i can provide hard to get qro hardline coax and appropriate dins/ntypes to match that are essential for your amplifier internal qro feeds – check the parts and price list for more details / just ask. back to powabeam antennas: i had the privilege to speak at the 2017 rsgb convention talking good design practice for home yagi construction – not my most comfortable place speaking in front of 100++ delegates although i hope the message was well received. i still see there is a desire for gimmick driven elements and matching systems which do nothing more than complicate construction and help push people to a commercial purchase. eme remains the testing ground for good designs and assure that maths cannot be deceived. if you do not receive signals at a similar level to similarly equipped and proven stations over a period of time then you have a problem. for example let me put this scenario to you – during good tropo conditions the difference between 59 and 59+10dbs doesnt count for much and you might not think much about it especially as ducting and locality make it exceptionally difficult to determine benchmarks to other locals. the only way to gauge yagi performance is to check for sunnoise or see how well you can receive a eme signal. designs up to 144 are most

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