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eHam Forums / Elmers / IC718 Filters
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on: May 15, 2008, 11:36:14 AM
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Has anyone REMOVED the Murata filter (2.1 kHz) and replaced it with 1.8 kHz filter?
I plan to put a 400 Hz filter in the optional slot.
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7
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eHam Forums / Elmers / rf overload?
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on: February 19, 2008, 02:49:43 AM
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Sean,
An inverted Vee antenna, with slopping down legs does NOT exhibit a 300 ohm impedance. The impedance more approximates 50 ohms with the legs at approx 45 degrees.
Sounds like you might have a mismatch problem.
The feed-line run of a little more than 35 feet, using coax, NOT RG58, but something along the lines of 9913. Has such a LOW loss at 40 meters it is not worth talking about...
My suggestion is to replace the twin-lead with 9913...
Good Luck
73 Charlie, WA2HMM
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eHam Forums / Elmers / Reported RF.......What to do?
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on: February 19, 2008, 02:31:55 AM
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"says I have bad RF.... ", is that anything like bad breath?? I know my RF bites me occassionaly.
In all seriousness Steve, I think you probaly mean the audio sounds ratty. That might be caused by a few things.
Is the Mike Gain set to high???
Are you OVER-driving the amplifier, causing flat-topping???
How is your ground system???
As you say, "Bad RF", RF getting back into the audio???
Get into a QSO with someone, who can copy you good enough to give to a audio report.
Then try to crank the mike gain lower, see if that fixes the problem.
Try to low the drive to the amplifier, either manually by turning the drive control down, of connecting up the ALC to the amplifier, and adjusting that.Is it only on one band??? Check your ground system, try shortening the ground bus, or lenthening it, see if the problem goes away. Make sure the connections are good both mechanicaly as well as electricaly. Keep in mind, you are working with RF not DC. If you are checking your grounding with an ohm-meter; zero ohms DC is not zero ohms at say 20 meters...The ground bus should be the bigest wireS you can find, copper braiding . Yes wireS, keep in mind certain lengths will be resonant at some frequency, so multiple wires work best.
Good Luck Steve, Hope this helps, 73 Charlie, WA2HMM
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eHam Forums / CW / I am taking my code test this weekend...any advice
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on: March 21, 2003, 06:04:11 AM
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Listen to the sounds and write it down, if you miss a letter DO NOT go back, it will slow you down. Continue on. Most people can comprehend the meaning of a sentence with multiple letters missing. The test is multiple choice.
If you miss a few letters: B AM an enn here, running
5 0 wat s. Now the test: His antenna is A) vert
B)Beam C) dipole, was he running A) 100 watts B) 200 Watts C)500 watts. Got the idea???
Relax, and enjoy your NEW license, or UpGrade. GUD LK
73 Charlie
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13
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eHam Forums / Mobile Ham / Taurus wagon Coax exit
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on: March 11, 2003, 09:01:12 PM
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I have a 1991 Taurus Station Wagon, need to get coax out to mag-mount, any Ideas??? would rather not use Glass mount, nor drill hole in roof.
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