W2PFY
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« Reply #25 on: December 23, 2010, 01:38:12 PM » |
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Don, did you ever try that tower on 75 meters?
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The secrecy of my job prevents me from knowing what I am doing.
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KA2DZT
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« Reply #26 on: December 23, 2010, 02:10:12 PM » |
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Steve,
To increase the bandwidth, use a larger diameter wire. Or, use a multi conductor cable. I use phone wire for antennas. Six conductors tied together, it works fine and it is stronger than one might think.
Not sure how much increased bandwidth can be achieved with this method on 160M.
Fred
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KM1H
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« Reply #27 on: December 24, 2010, 11:55:38 AM » |
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Any ATU is an added pain in the butt if you like to move around a lot. I could be up on AM one minute and then see a CW DX spot. All I do is double time the xcvr dial down and hit the amp dials using the preset numbers on a cheat card above them.
Fast in and fast out and Im not losing dB in the average low C ATU on 160. I had tried a HB roller inductor ATU with 500pf caps but the tuning was too touchy with wide grid current excursions. It was easier to modify the amp.
My feedline for 80/160 is 450' of 3/4" CATV line that has been up for 20 years. Curves run at the top of the tower a few months ago match whats down in the shack....feedline loss is out of the equation...there aint none of any consequence.
If you spend too much time reading Maxwell you will never get on the air. Its too deep and fussy to be of much pratical use. KISS
Carl
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k4kyv
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Don
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« Reply #28 on: December 24, 2010, 02:06:30 PM » |
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Any ATU is an added pain in the butt if you like to move around a lot. I could be up on AM one minute and then see a CW DX spot. All I do is double time the xcvr dial down and hit the amp dials using the preset numbers on a cheat card above them.
If you spend too much time reading Maxwell you will never get on the air. Its too deep and fussy to be of much pratical use. KISS I guess that is true for the modern-day appliance operator. But many here in the AM community run homebrew, converted broadcast or vintage ham transmitters that have to be tuned to frequency, stage at a time. This includes even the class E guys. The ATU is a minor inconvenience if you have 3 or 4 other stages to re-tune when you QSY. You will learn a lot more from reading Maxwell than from giving out five-nines to contesters or hello-g'by 73 pse QSL QRZ? DX contacts. Most AM operation is laid back enough that everyone has time to manually tune up. |
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Don, K4KYV AMI#5 Licensed since 1959 and not happy to be back on AM... Never got off AM in the first place.- - - This message was typed using the DVORAK keyboard layout. http://www.mwbrooks.com/dvorak |
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KM1H
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« Reply #29 on: December 24, 2010, 08:44:00 PM » |
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I guess then that my fault Don is having too much gear to play with which ranges from late 20's to a mid 90's top of the line TS-950SDX.
However Im far from just an appliance operator, I even do my own repairs including SS surface mount. Can you claim the same?
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WA1GFZ
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« Reply #30 on: December 24, 2010, 09:05:11 PM » |
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16 pin dips have gone the way of the octal.
Now how do you replace a BGA
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Steve - K4HX
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« Reply #31 on: December 24, 2010, 09:08:23 PM » |
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BGA? That's old school. 16 pin dips have gone the way of the octal.
Now how do you replace a BGA
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WA1GFZ
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« Reply #32 on: December 24, 2010, 09:23:57 PM » |
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Yea, when we homebrew hybrids and all have our own wire bond welders
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Steve - K4HX
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« Reply #33 on: December 24, 2010, 09:41:05 PM » |
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And an electron microscope. Yea, when we homebrew hybrids and all have our own wire bond welders
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KM1H
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« Reply #34 on: December 25, 2010, 03:32:07 PM » |
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I had to give up my wire bonder for more space and thats at a friends down the street where he and I still use it. I still have and use the B&L microscope here.
At one point in my employed life I was working up to 75GHz. At home I stop at 24GHz.
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K1JJ
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"Let's go kayaking, Tommy!" - Yaz
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« Reply #35 on: December 25, 2010, 04:04:42 PM » |
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I'm still trying to figure out how Santa can fly upside-down in Australia without his toys falling out.
T
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Use an "AM Courtesy Filter" to limit transmit audio bandwidth +-4.5 KHz, +-6.0 KHz or +-8.0 KHz when needed. Easily done in DSP.
Wise Words : "I'm as old as I've ever been... and I'm as young as I'll ever be."
There's nothing like an old dog.
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Steve - K4HX
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« Reply #36 on: December 25, 2010, 08:59:49 PM » |
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Did you work DXCC at 75 GHz? I had to give up my wire bonder for more space and thats at a friends down the street where he and I still use it. I still have and use the B&L microscope here.
At one point in my employed life I was working up to 75GHz. At home I stop at 24GHz.
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KB2WIG
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« Reply #37 on: December 26, 2010, 09:11:07 PM » |
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"
I'm still trying to figure out how Santa can fly upside-down in Australia without his toys falling out. "
T,
Obviously, he uses magic dust .................
piker
klc
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What? Me worry?
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flintstone mop
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« Reply #38 on: December 27, 2010, 09:30:35 AM » |
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Can I join the fray?
Tom things are upside down in China. Remember the old cartoons??
Some folks are a little too concerned about losses. There's more to Amateur radio than 1880 and 3705 or 3885.
I'm using PSK31 on 40M and it's nothing but 'canned' responses and reports and I have been giving greyline a workout on 40M. It's a self-rewarding thing that I made contact with someone half a world away from my little station. The 599 reports are usually not given using greyline.
I was on 1885 on my vertical and the SWR was almost equal to my forward and there were decent reports. I discovered my bad, that a relay had not been activated to get the tuner at the base of the vert to switch in and give 1.5:1 SWR. The others only saw a slight increase of less than a S- unit. BTW Carl, those elevated radials are FB OM
QIX may have an advantage with his antenna, as there is a very long downward slope moving away from his antenna field.
enuf from MOP
Happy NEW YEAR
fred
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Fred KC4MOP
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ke7trp
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« Reply #39 on: December 27, 2010, 02:16:59 PM » |
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The losses of 2 to 1 are minimal. The tuner is there to make the transmitter happy. This thread has really wandered off path. To increase bandwidth he needs more wires. Larger wire will help a bit but not much. I say put a tuner inline and relax and enjoy the radio
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flintstone mop
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« Reply #40 on: December 27, 2010, 04:10:58 PM » |
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The losses of 2 to 1 are minimal. The tuner is there to make the transmitter happy. This thread has really wandered off path. To increase bandwidth he needs more wires. Larger wire will help a bit but not much. I say put a tuner inline and relax and enjoy the radio
I'll quote Alfred E Neuman...What Me Worry?.......you are right we drifted off freq here. |
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Fred KC4MOP
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KM1H
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« Reply #41 on: December 27, 2010, 09:04:41 PM » |
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Did you work DXCC at 75 GHz? I had to give up my wire bonder for more space and thats at a friends down the street where he and I still use it. I still have and use the B&L microscope here.
At one point in my employed life I was working up to 75GHz. At home I stop at 24GHz.
No just a back up radar detector, it was for Mercedes, does that count as a seperate country? Fred, Im glad the elevated radials are working for you. |
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Steve - K4HX
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« Reply #42 on: December 27, 2010, 09:45:03 PM » |
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It's German, right?
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WD8BIL
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« Reply #43 on: December 27, 2010, 10:51:56 PM » |
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The losses of 2 to 1 are minimal. 2:1 VSWR= 11% reflected power 1.5:1 = 4% Ref. Power Take ur pick. |
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K1JJ
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« Reply #44 on: December 27, 2010, 11:15:39 PM » |
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1:1 = 0% reflected power 1,000,000,000,000 : 1 = .99999999999% reflected power Now pick your nose, caw mawn...  |
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Use an "AM Courtesy Filter" to limit transmit audio bandwidth +-4.5 KHz, +-6.0 KHz or +-8.0 KHz when needed. Easily done in DSP.
Wise Words : "I'm as old as I've ever been... and I'm as young as I'll ever be."
There's nothing like an old dog.
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Steve - K4HX
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« Reply #45 on: December 27, 2010, 11:24:59 PM » |
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Reflected power and loss are not equal. Steve's loss at 2:1 SWR will be about 0.07 dB more than if the SWR was 1:1. Doesn't seem worth worrying about.
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ke7trp
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« Reply #46 on: December 27, 2010, 11:35:37 PM » |
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Exactly .
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flintstone mop
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« Reply #47 on: December 28, 2010, 05:19:36 AM » |
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Reflected power and loss are not equal. Steve's loss at 2:1 SWR will be about 0.07 dB more than if the SWR was 1:1. Doesn't seem worth worrying about.
AAAmen brotha and pass the poke chops. |
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Fred KC4MOP
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W3SLK
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« Reply #48 on: December 28, 2010, 07:35:12 AM » |
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Steve said: Reflected power and loss are not equal. Steve's loss at 2:1 SWR will be about 0.07 dB more than if the SWR was 1:1. Doesn't seem worth worrying about. Yes it is. It helps promote the sale of watt/SWR meters!  |
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Mike(y)/W3SLK
Invisible airwaves crackle with life, bright antenna bristle with the energy. Emotional feedback, on timeless wavelength, bearing a gift beyond lights, almost free.... Spirit of Radio/Rush
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WA1GFZ
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« Reply #49 on: December 28, 2010, 08:13:38 AM » |
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A class e transmitter is easier to tune into a flat antenna. I use a tuner on 160 so my class e output circuit is just a series tuned circuit with 1 cap and 1 inductor. A second cap is required if the load isn't flat to get the best power transfer and a bit more complicated to tune.
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