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Re: wire
K9UDX
N4JTE has written an article describing how to make a 6 band version for around $35. The article can be found on at . Bob loves experimenting with antennas.
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vk2dmh wrote: You can make a FAN multiband antenna with several sets of wire, for example set up dipoles for 80m, 60m and 17m then see if the tuner will find a happy setting for all your frequencies. In the HFLINK group, which is about HF radios that use Automatic Link Extablishment (ALE) they have several auto-tuner broadband antenna designs like this. --
Bob Harris (K9UDX) Bath, NH |
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Re: wire
vk2dmh
You can make a FAN multiband antenna with several sets of wire, for example set up dipoles for 80m, 60m and 17m then see if the tuner will find a happy setting for all your frequencies. In the HFLINK group, which is about HF radios that use Automatic Link Extablishment (ALE) they have several auto-tuner broadband antenna designs like this.
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Good luck! de David, VK2DMH PS: Since this group is now being spammed, I have switched off receiving emails from here. Sorry. Email me direct if you need to. --- In YaesuTuner@..., "raimo" <oh6bi@...> wrote:
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Re: AH3 vs FC40
fil_jds
Hi J-C,
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sorry to reply this late, as usually this group was not very much "alive" I did not visit it for quite a while. Unfortunately, on the topic of sloping wire antennas and RF ground on a sailbout, you will find 99 different opinions and views. Look up on eHam forum, you will find the same comments stating that the impedance matching range of the FC40 is unfortunately a bit narrow, hence it is quite picky and sensitive to wire length. Even in the home QTH, trying out inverted-L wire antennas WITH a large RF ground system (2.4 m long earthing rod, with several radial wires about 5 cm buried in gravel, with lengths ranging from 20m,15m,10m,7.5m,5m to at elast cover most of the HAM bands, it was still rather difficult to find a wire length offering all-band tuning with the FC40. About 23m was OK, and also around 9.6 m. On the boat, I've tried a lot. As RF ground I have 4 inch wide copper straps, running from the FC40 ground lug to both sides of the pulpit bases, and from there also connected to the lower S/S lifelines of my Jeanneau 37 ft. From the tuner RF ground lug also 2 sets of radial wires, 10m and 5m long, tied with tie-wraps to inside of the aluminium toe-rails (le rail qui court le long des c?t¨¦s du pont, entre pont et cocque). Furthermore copper tape to the bronze underwater strut supporting the propeller axle. Since originally the boat also had a woven tinned copper strap running from engineblock (also the DC negative ground), and to prevent potential galvanic corrosion issues due to ground loops or high voltages pumped into this strut, I blocked the DC with about 0.15 microF of high voltage caps. I do think I have quite some RF ground availbale with this. I never did run copper tape to the iron keel bolts. That would be at least 5m of copper tape which for the higher frequencies is just too long. Antennas: I tried all lengths between 14m and down for the sloping backwire antenna (of course I do not use the backstay but a sloping wire parallel to the backstay running to the starboard side of my pulpit ("balcon arri¨¨re"). No length was ok for 80m-40m-20m-17m and 15m allband, except around 9.6m. Length is very critical. Sometimes adding a little "pigtail" extension at the point where the bottom of the antenna wire is bolted to the isolated through-hull helped 80m tuning. After that Greg on the SSCA forum talked me into a parallel multiwire system, with 13m, 6.5 and 3.75m parallel wires with 10cm spreaders in between, but all connected together at the base, and with a 1:1 current balun at the bottom (derived from K9YAM antenna). That tunes quite OK on all those freq's,theory says every freq will choose maximal current in the optimal choice of wire, and still offering low-angle radiation. Others critised this heavily, saying that its radiation angle behaviour would be very unpredictable. It tuned well but DX results were bad. So I took it down... Now I have a wire of about 10.5m, connected to the isolated through hull. Directly connected to the underside of the through hull, inside the back lazarette ("coffre arri¨¨e tribord") I have the HD 1:1 current balun (13 turns of teflon coax around a Amidon T300A core) and 40 cm of teflon coax from the balun to the FC40. I did this to avoid 45cm of antenna wire running inside the "coffre" to the FC40. I now have the RF ground system connected to the balun ground output. I have no idea of losses in this balun + short coax system to the atu, but it does tune well on all my wanted frequencies, even on 12 Mhz marine SSB freq. I had DX contacts to Japan with this on 17m and 20m, from the sea. Does that prove anything? Not really....I guess a more standardised test with a fixed receiving station and also field strength measurements and antenna modeling would tell me more. The 10.5m wire length should give low angle take off from 40m till 17m (really the limit for 17m since 10.5m is just a triffle more then 0.625 Lambda) So far my story. Jan ON3ZTT --- In YaesuTuner@..., JD Baillie <tisvcs@...> wrote:
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Re: wire
raimo
Hi Scott.
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I am sorry, but there is no such "all band wire" !! I have tried many lengths with different grounds and counterpoises. It is allways compromise with other things. Try to read group messages and files , then compare members results with your possibilites. 73s es GL de rami, oh6bi --- In YaesuTuner@..., "ve3wwt" <ve3wwt@...> wrote:
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Windom Test
raimo
Hi All.
I made Single Line Feeder Windom Last weekend. Matching (tuner) Unit: FC40 Yaesu endfed tuner, Radio Yaesu FT897. Antenna was working against ground system, tuner at 3 m height. Antenna was inverted V position, highest point 11m from ground, hanging from feeder connection. Angle abt 120 gedrees. Wire ends more than 5 meters from ground. Dimensios at start: Longer wire 28m (91.8 ft), Short Wire 14 m (45.90 ft) , Feeder 8.2 m (26.90 ft) First I got good match all HF bands 1.8 MHz to 29 MHz except 7 MHz. After some calculations I shortened longer wire 75 cm and I got perfect 7 MHz tune, But same time I lost 3.5 to 3.6 Mhz match. After many canges I finally got this windom working at all HF bands: Dimensions at the end: Longer wire 27.35 m (89.7 ft) , Shorter wire 13.45 m (44.10 ft) , feeder 8,2 m (26.90 ft) . It was not enough time for DX testing, but local (10 to 300 miles ) QSOs at 80 and 40 m Gave similar reports between horisontal full size G5RV and this Windom. I did good experiment, easy, cheap and fast made antenna giving OK results. 73s de rami, oh6bi |
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Re: 148 ft wire testing
raimo
Hi All.
I copy here a messge I wrote in another group, maybe it is intresting also here : ' ' ' Hi BoB and All. Thanks. Yes I have somtimes red those stories, this 90 meters is new to me. There is plenty of info, but mainly idea with these kind of tuners is that operator has to know what he is trying. As well as normal dipoles etc. These are not any magic boxes, just simple LC tuners. (with CPU and other clewer stuff) This morning here in Vaasa area temp was minus 2 celsius, needed to skratch ice from windscreen, the sea is getting soon ice cover and not so much time anymore at summercottage. I already brought some radios to town and next random wire tests starts again in May. Next eperiment with FC40/FT897 is "original" windom with single line feeder. I made original windom some yaears ago with AH3/IC706 and that was working very well. Hopefully I get this tested next weekend. My target with all these testings is to find good travelling wires, so that I dont need to use time to search the lenghts. At "permanent" QTHs it is different, as I have had some antennas many years in same place.. 73 se GL QRP DX de rami, oh6bi --- In CW-Code-Warriors@..., MAXXOUT2@... wrote:
--- In YaesuTuner@..., "raimo" <oh6bi@...> wrote:
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Re: 148 ft wire testing
raimo
I made a mistake: copying partly from old message:
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119 wire first ... should be 148 wire. --- In YaesuTuner@..., "raimo" <oh6bi@...> wrote:
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148 ft wire testing
raimo
Hi All.
I made 148 feet wire test last weekend. FC40 is abt 10 ft from ground, 119 wire first straight up 20 feets, to highest point at 30 feets, after that horisontal and straight until it ends at 20 ft height. Radio FT897 and FC40. Just fast test: tune or not.. 1810 to 2000 kHz: Tuned 3500 to 3740 kHz: No Tune 3745 to 3800 kHz: Tuned 7000 to 7200 kHz: Tuned 10100 to 10150 kHz: Tuned 14000 to 14350 kHz: No Tune 18068 to 18168 kHz: Tuned 21000 to 21450 kHz: Tuned 24890 to 24990 kHz: Tuned 28000 to 29700 kHz: Tuned 50000 to 52000 kHz: Tuned 73s es gl de rami, oh6bi |
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119 ft Wire testing
raimo
Hi All.
I did some testings with 119 foot wire at cottage. Radio: FT897, Ant Tuner: FC40, end fed tuner. Ground: one 20m long 16sqmm copper loop buried in ground 2 feets, two 10 ft copper/steel ground rods. Distance between each ground component abt 15 feets. all connected together with 25sqmm copper and to electrical ground. Soil conductivity not known. FC40 is abt 10 ft from ground, 119 wire first straight up 20 feets, to highest point at 30 feets, after that horisontal and straight until it ends at 20 ft height. I didnt do impedance measuring, forgot Analyser at home... Just trying to tune with FC40. 1815 kHz to 1999 kHz: perfect tuning. 3500 kHz to 3800 kHz: no tune 7000 kHz to 7150 kHz: no tune 7151 kHz to 7200 kHz: tuned (not perfect) 10100 kHz to 10149 kHz: tuned 14000 kHz to 14350 kHz: tuned 18100 kHz : band was not tested 2100 kHz to 21450 kHz: not good, some frgs tuned 24900 kHz : band was not tested 28000 kHz to 28600 kHz: perfect tuning, I didnt test higher. Next weekend maybe trying 148 feets. 73s es gl dx de rami, oh6bi |
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VE3EED's intresting Link
raimo
Hi All.
I got intresting link from other Yahoo group (() ( there is good info abt MagLoops, even some my loop photos)) Try the Group, I like it.. VE3EED has done some maths for endfed wires. List of useful lengths. I copied result to excel and converted feets to meters : ft m 29 8,85 35,5 10,83 41 12,51 58 17,69 71 21,66 84 25,62 107 32,64 119 36,30 148 45,14 203 61,92 347 105,84 407 124,14 423 129,02 Goeing to test at least one of these with FT897/FC40. At the moment I dont have good wire for 160m , thinking to test 107 or 119 at cottage next weekend. 73s es GL de rami, oh6bi |
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Re: AH3 vs FC40
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Re: AH3 vs FC40
GUILLOT JC
My backstay is 13.7 meter long which puts limits to my isolated backstay, I thought to 12.5 meter as the 20 meter band will be my favourite band (mostly digital traffic with Pactor modem but also SSB operation on various sailors Pacific nets).
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As counterpoise I plan to link my keel and diesel engine by wide (around 1 inch wide) flat copper ribbon to the FT897D tranceiver and the FC40 ATU. The keel is about 1.85 meter deep, made of steel covered by epoxy and weights about 1 300 kilograms, between 2 and 3 square meter area. I think this should work well by capacitive effect with the surrounding salt water, for the moment I do not intend to have a grounding brass plate outside but I can change my mind. Any comments will be appreciated. 73s to all. FK8IH --- In YaesuTuner@..., JD Baillie <tisvcs@...> wrote:
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Re: AH3 vs FC40
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Re: AH3 vs FC40
GUILLOT JC
Thanks for your interesting post. I want to use my FT897D with a FC40 on board my sailboat and I read many proposals for the "good length" of the isolated backstay, I had thought to 12.5m but as you say it does not work I shall keep your suggested 9.6m length BUT what do you call a 0.4m pigtail ? Could you explain lease, I would like to have the system working well on all HF bands.
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73s and best regards from FK8IH The wire antenna is 9.60m long, and tunes all freq but only upper |
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New file uploaded to YaesuTuner
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the YaesuTuner group. File : /FC40 and 3 Wires.xls Uploaded by : oh6bi <oh6bi@...> Description : Testing some wires and FC40 You can access this file at the URL: To learn more about file sharing for your group, please visit: Regards, oh6bi <oh6bi@...> |
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