Давненько еще, я спрашивал у Криса про его антенну. В прошлом году он вполне успешно принимал на неё и наших отсюда, и VO1NA, и прочих американцев и всю Европу.
Меня основательно удивили возможности столь простой и низко подвешенной конструкции на таком количестве диапазонов.
Безусловно, свою лепту вносит факт того, что живёт он в сельской местности и нигде рядом не видно мощных источников помех или стоящих рядом домов соседей с китайскими зарядниками.
На днях, дело у него дошло до передачи....
Я поинтересовался у него, безусловно, на какую антенну он передавал - так оказалось, что на свою волшебную всеволновую рамку!
Итак - получается работает она от 136 КГц до 50 Мгц без каких-либо перестроек и дополнительных согласующих устройств!UPD - ввёл вас всех тут в заблуждение.
на приём он действительно использовал её с ШПТ и на ДВ, в том числе.
А на передачу - закоротил питающую линию и использовал её как очень короткий вертикал 5-6м высотой с емкостной нагрузкой в виде этой самой рамки сверху.
От души поздравляю Криса с оглушительно успешным
дебютом в качестве "передатчика" на ДВ!
А так же прилагаю его письма с пояснениями и картинку со схемой рамки.
Hi, I was using my big horizontal quad loop, about 25 to 30 feet off
the ground, two corners are higher than the other two. Corner fed with
ladder line. TX is a Kenwood TS-590, running its 5 Watt minimum, but
would be lower outputs as i reduce the audio drive in WSPR. My
Wattmeter is not accurate that low, but definitely LESS than 5W out.
The quad loop is about 380 feet in circumference. See attache.
Сегодняшнее письмо про детали по части передачи:
Thank you all for the congratulations and reports. Very early days
yet, and many improvements need making. The aerial is my HF horizontal
quad wire loop, up about 25 feet max, fed in a corner by my bungalow,
(its lowest point too, so not ideal...), using the shorted windowed
ladder line as the vertical. A six foot long ground spike near the
feed point is the only earth. I want to raise the loop higher, add a
ground wire under the perimeter, and add more ground spikes too. I may
try using a grounded electric fence as an addition too, it runs almost
underneath one leg of the loop.
As this is also my HF aerial I need to add some sort of relay to
disconnect the shorted feeder from the LF matching coil and connect to
a balun for feeding my HF stuff. Right now I can either use HF or LF
and changing means a trip outside and much fiddling about. I am
thinking of using an active whip and separate receiver for LF
reception and a grabber though.
I need to improve matching and resonance slightly, but intend changing
the feeder co-ax to the aerial for something less temporary. I built a
scopematch and see the following right now, so room for improvement I
feel:
http://www.chriswilson.tv/scopemeter-tx-full-power.jpgThe driver is the DRV output at 1mW from my TS-590 feeding a W1VD pre
amp and W1VD frequency doubler, then running a G3YXM FET amp.
I noticed a hot smell from it last night, then it blew the RCD trip on
the house electric panel. It ran again, but again on higher power
ranges it did the same again. as it has over current and high SWR and
drive loss safety cut outs I suspected something in the power supply,
and indeed, it seems the toroidal mains transformer was getting hotter
than I would have liked. I am wondering it it has an internal
intermittent short? I may high pot test it later.
My other issue is I have modded my TS-590 to use a VK3HZ GPS locked
master oscillator, fed from my Trimble Thunderbolt GPS.
http://www.vk3hz.net/XRef/XRef_Home.html#XRef-VxIt has worked perfectly for months. But now I am TX'ing on 136kHz it
is picking up RF, either into the Thunderbolt GPS itself, or a divider
board that offers divisions of 10MHz for other uses in the shack. I
see the square wave at 10MHz from the divider go crazy on my scope
when I TX, so I am not using the GPS locked oscillator and find my
signal is 3Hz off without it running. I am trimming on the actual rigs
frequency setting to compensate.
So a few improvements to play with, and the issue of the GPS locked
oscillator to fix. But I am over the moon to be finally able to TX
rather than just listen.
A big step for me has been taken though! All the best.
--
Best regards,
Chris mailto:chris@chriswilson.tv
