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Type: Posts; User: Psi*

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  1. Replies
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    I wonder if the isolator has DC ground. Maybe Ohm...

    I wonder if the isolator has DC ground. Maybe Ohm it to check. If so, make sure it has a resonable ground.

    I have become a fan of 1:1 baluns in general specifically for this feature. Draining off...
  2. Thread: Just Joined

    by Psi*
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    321

    Hi AA ... what are interested in ... ham and...

    Hi AA ... what are interested in ... ham and maybe not so ham?
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    2,808

    Skin effect is not what causes RF current to stay...

    Skin effect is not what causes RF current to stay inside coax shield. First, RF current passes thru woven coaxial shield because it leaks. It is not a perfect shield. Double shielded ... still leaks,...
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    2,632

    Hi Rich, my property has a shelf 4' down and I...

    Hi Rich, my property has a shelf 4' down and I used a hammer drill. New building up the street had a jack hammer on a tractor to chip out the rock for a partial basement. I hammered the 8' rods down...
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    Driving ground rods at an angle, even a steep...

    Driving ground rods at an angle, even a steep one, is about all that you can do. And, best not disturb the soil by digging a trench. But, you can only do what you can do. Maybe a few more rods 20' or...
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    2,882

    I think that is a bazooka balun sans the other...

    I think that is a bazooka balun sans the other half of the dipole
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    2,882

    First, this is a monopole. As a result it must be...

    First, this is a monopole. As a result it must be installed on a ground plane, aka a sheet of metal as might accurately remember 1/4 wavelength or maybe it is a 1/2. Without which, performance sucks....
  8. Define what you consider effective? For me, the...

    Define what you consider effective?
    For me, the answer is that using antennas with design would be an exceptionally poor match. Meaning very little power delivered to the antenna and not effective...
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    456

    Eventually you will need a balun to get to the...

    Eventually you will need a balun to get to the coaxial input of your transceiver. Many commercial baluns have a ground terminal that provides a DC connection to both sides of the dipole. And that...
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    Pat is correct about accuracy. When digital...

    Pat is correct about accuracy. When digital multimeters came out it was a standing joke that it took much longer to set a voltage because people were determined to get that last insignificant digit...
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    A few years ago I got a great deal on 2 Bird...

    A few years ago I got a great deal on 2 Bird wattmeters with a large assortment of elements covering all ham bands and power levels. Sort of the go to package, but I was starting to investigate...
  12. I have a grid dish for 2.4GHz. Guessing that it...

    I have a grid dish for 2.4GHz. Guessing that it is ~2' diameter ... something like this but not that exactly tho pretty close. At the moment, I forget exactly where I bought, but is was inspired by...
  13. what 5b4ajb says

    what 5b4ajb says
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    I had not heard of this. The fellows at fmt-nuts...

    I had not heard of this. The fellows at fmt-nuts might have some info.

    I have read about H or V polarized HF signals changed to circular polarization after ionosphere bounce. After a move in the...
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    There are a few hard to find test reposrt on the...

    There are a few hard to find test reposrt on the Chinese radios. I can't find one now to help. Generally, the results show pretty lousy selectivity and ample sideband noise. A conclusion is ... so...
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    Sticky: THAT works ...

    THAT works ...
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    Handheld Radios You might be listening to the input side of the...

    You might be listening to the input side of the repeater and directly receiving that ham's transmission. Find the repeater's tx freq and set your baofeng's rcvr to that.
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    Not sure what Top Band means, but for Ohmic...

    Not sure what Top Band means, but for Ohmic resistance a 1000' #13 is ~2 Ohms ... at 68 deg F

    Yes, for 160m it would have to be at least 130'.

    There were plenty of nulls predicted off my loop...
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    I had a horizontal loop similar to JohnD. I made...

    I had a horizontal loop similar to JohnD. I made a computer model before I put it up which guided me to how much ladder line to drop for the feed. The total loop was probably ~270' & the dropped...
  20. Thread: Hams and 11m

    by Psi*
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    6,286

    I am too lazy to research this for actual links...

    I am too lazy to research this for actual links ... 11 meters is the CB band and usable with only properly certified radios which are not any ham radios. Once upon a time (and maybe still) getting...
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    I am guessing that this amp was found not...

    I am guessing that this amp was found not operating. Not necessarily not operable.

    So, any documentation of any kind available?
  22. Thread: SDR - darn it!

    by Psi*
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    4,122

    At my request several months ago, they added the...

    At my request several months ago, they added the ability (a "button" push) to separate CW signals to left & right headphone speakers. Basically, the rcvd signals above the the rcvr tuned freq and in...
  23. Thread: SDR - darn it!

    by Psi*
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    4,122

    Ots ... I took your approach. Doing actual...

    Ots ... I took your approach. Doing actual research before buying something and then asking everyone what I had bought. A bit scarcastic, but it seems to happen a lot.

    I am also a born again ham...
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    The idea of grounding for direct lightning...

    The idea of grounding for direct lightning strikes is to divert as much energy as possible. THAT is all that can be done and you do not want it to find a path thru your home. You want a direct...
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    Having a SDR with a waterfall spectrum display...

    Having a SDR with a waterfall spectrum display saves a lot of that. But, I'm not really into contesting. Feels like a drive by shooting ... feels like what it must feel like:smilet-digitalpoint
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