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16
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eHam Forums / Mods And Repairs / RE: MFJ 986
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on: April 24, 2012, 12:41:37 PM
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Hi James WD5,thanks for replying,yees I do have 2 antennas connected to the tuner and it blanks any signal when I go to coax2 or coax2 direct,yes I have had to change the plugs on the rear of it a few times,I will open it and look at the switch,I rarely go between antennas and would never hot switch it but you could be right about the lightning strikes,im using a new 20 metre loop here at 70 feet and its working well for DX all round,thanks again James I will let you know what I find,cheers Richard
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17
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eHam Forums / Mods And Repairs / RE: MFJ 986
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on: April 23, 2012, 11:52:59 AM
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hi K8AXW,Richard here,no its not an antenna prob as i have just spent 2 months finding out,when I put antenna in coax1 plug it is fine,will have to take it apart and chect it out,you could be right about the switch but i rarely go between 2 antenna so I doubt it was hot switching,thanks again,cheers Rich
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18
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eHam Forums / Mods And Repairs / RE: MFJ 986
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on: April 22, 2012, 06:54:58 AM
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hi by dead i mean if i use an antenna in coax1 signal will be fine but switch to coax2 and al signal is gone just like if no antenna is plugged in,i got fooled by it and have just replaced a load of RG-213 cable to a 20 mtr loop
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19
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eHam Forums / Mods And Repairs / MFJ 986
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on: April 22, 2012, 05:44:24 AM
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Hi im using an MFJ-986 tuner,when I switch to coax 2 the radio goes dead,do they give trouble inside,I only run 400 watts into it and use a carolina windom and a loop antenna on it,any ideas,cheers EI5GUB
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20
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eHam Forums / Antennas and Towers and more / RE: 20 meter loop
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on: April 18, 2012, 01:28:23 PM
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Hello Dale WB6BYU,I looked you up,thanks for all the info and doing modeling for me,I was away working the last few days,yes 7 mtrs a side is to small,I made it that size and anaylsed it and it showed reonance around 14,400 so I need to add a bit to it,I got 75 ohm cable and used analyser to get 1/4 wave electrical length,it brought down swr alot,will have to add wire to it this weekend,it should work well as it will be 70 feet high,im also replacing the feeder with a shorter length of RG213,let me know what you thinkalso do you have any information on 2:1 baluns,thanks again Richard
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22
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eHam Forums / Antennas and Towers and more / RE: 20 meter loop
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on: April 12, 2012, 12:10:13 PM
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hi i got some 75 ohm coax and am making a 1/4 wave matching section,when I have it connected to the antenna and go analysing will I see 50 ohms at the end of the 1/4 wave or does it need to fed into 50 ohm cable also and then then checked
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23
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eHam Forums / Antennas and Towers and more / RE: 20 meter loop
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on: April 11, 2012, 02:33:45 PM
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yes Dale it is vertical and will be 70 feet high between 2 big fir trees,I know you can feed them at different points so they are either vetical or horizontal,but will stick with bottom corner,Iwill stick with a triangle loop rather than a circular one as it seems they have not much gain
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24
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eHam Forums / Antennas and Towers and more / RE: 20 meter loop
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on: April 11, 2012, 02:30:14 PM
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Hi WB6BYU thanks for alot of info,I was using 1 foot of coax to analyser,the loop is triangular and is equal sided,7 mtrs a side and was tested horizontal,I will have to find a 1/4 wave piece of 75 ohm coax and try it.
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25
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eHam Forums / Antennas and Towers and more / RE: 20 meter loop
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on: April 11, 2012, 12:34:11 PM
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Hi K0ZN,thanks for replying,yes I was thinking a 2 to 1 would do the job but they are impossible to get here in Ireland and I would build one no problem if I could get some instructions,9 6 and 4 to 1 seem quiet common but 3 to 1 or 2 to 1` seem scarce,im putting this loop up at 70 feet pointing north west /south east out of central Ireland so will be good for USA and down into Asia
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27
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eHam Forums / Antennas and Towers and more / 20 meter loop
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on: April 11, 2012, 11:46:10 AM
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Hi everyone,Richard EI5GUB here,Ive just put a 20 mtre loop up and fed it into a 4:1 balun,it shows 50 ohms at 14.185 but has an SWR of 3 to 1,how can I get this down,also when I removed the Balun and fed direct to the Anaylser it shows an impedeance of around 75 to 80 ohms which probably puts a 4:1 balun out of the picture,the antenna was 4 feet off the ground when tested and the cable from balun to anaylser was 1 foot longim planning a complete circular loop if I can get this delta working right,any advice please,cheers Richard Gorman.
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29
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eHam Forums / Mods And Repairs / Yaesu FT 2000
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on: November 02, 2010, 12:40:13 PM
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Hi I have a Yaesu FT2000 and use one of the sockets at the back that has 12 volt output to power a light in an swr metre,it seems the fuse has blown but the book says it has a separate fuse but I cant find it,anyone have any ideas please.
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30
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eHam Forums / DXing / RE: K4MDX
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on: September 14, 2010, 02:09:10 PM
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Hi thanks lads,he was shown on a few clusters as Midway Is. but I guess it is wrong,I thought I was lucky until I read his card in the post,thanks again.
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