Dan KD2EE
  • Member for 8 years, 3 months
  • Last seen more than 7 years ago
How to calculate power loss between radio and antenna
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4 votes

There are a few possibilities. First of all, in larger assemblies (mostly important in repeater design) each component will have a parameter called insertion loss. This is the loss, in dB, through ...

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What are CQ/ITU zones used for?
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4 votes

Many contests use them as a convenient measure of how many different "regions" you've managed to contact. Since using countries as a contest multiplier isn't necessarily very accurate (within a ...

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GNU/Linux contest logging software?
4 votes

I've used CQRLOG which is built on MySQL but otherwise has many of the same features as other loggers and is fully customizable. If that's too much and you're looking for a simpler solution, Xlog is a ...

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What antenna to use for medium frequencies in an apartment building?
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4 votes

So it sounds like you want to do everything. There's nothing wrong with that, but there's no single answer of one antenna that can do everything. You are going to hit a certain wall at either 40 or 80 ...

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How do I find a frequency to call CQ on during a contest?
3 votes

You can also use anything with a waterfall display to help you find open space. If you're set up for digital mode operation, you can run fldigi even for CW contests, use that to find the best "gap", ...

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Buddipole model comparison
3 votes

All of the buddipoles appear to be electrically the same antenna. The mini takes the two longest parts and puts a joint in the middle, so instead of having two 22" parts, you have four 11" parts, so ...

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When should an adapter be used to marry a coax to a connector?
3 votes

Always use a connector intended for the size of coax you are using. Every adapter has a certain insertion loss - a cost, in decibels, of "inserting" it into the line. It's best to use the correct ...

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Understanding "ground" in ham radio
2 votes

There are two traditional meanings of an electrical "ground". In DC systems, we often refer to the return conductor (the negative lead) as "ground". You won't encounter that meaning very often in ...

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What are the electrical differences between smaller and larger coaxial cables?
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2 votes

There are three basic electrical characteristics: characteristic impedance, loss per unit distance, and velocity factor. Most amateur radio rigs and antennas expect to see a characteristic impedance ...

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Do electronic ballasts for fluorescent tube lamps cause HF interference?
2 votes

To the question in your title - do they cause interference - the answer is absolutely yes. However, it's hard to answer which causes more simply because there is a lot of variation between ...

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Will anodizing or powder coating or wetcoating (painting) antenna elements affect performance?
2 votes

It almost definitely won't - but there are effects that could be some coatings that would cause problems. It isn't just metal content, there's also the possibility that some coatings could absorb RF ...

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How can one convert from Lat/Long to Grid Square?
2 votes

You can start by using a map, but that gets out of hand once you get beyond the second set of digits. There are calculators online, like this one from QRZ or this map-based locator. It's possible to ...

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Metal for antenna construction?
2 votes

Yes, but unless you get really carried away it doesn't matter. The amount of metal being used, whether it be a bar, pipe, or sheet, is enough to make any concerns about resistive losses meaningless.

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Is there a way to modify my Yaesu FT-60 to transmit on all 4 ham bands it can receive?
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2 votes

No. You likely would need to build two new transmit stages and rewrite the firmware. Each transmit stage uses a precise final oscillator and mixer which is specific to the frequency band as well as a ...

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Has a vehicle magnetic antenna mount ever caused a road accident?
1 votes

They can absolutely come off. Here is a forum thread with numerous posters reporting antennas falling off from the wind of passing a semi - it's a storm chaser forum, but the storms weren't even ...

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How to improve VHF/UHF Baofeng UV-82 HT reception in vehicle
1 votes

Mag mounts really aren't all they're cracked up to be. You'll see some improvement just because the antenna is outside of the car, but a through-roof mount gives you a good ground connection and no ...

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How do I evaluate the features and performance of radios?
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1 votes

You're getting a better warranty and the ability to send it for repair if you have issues. You get a better manual, a programming and operation experience that has been improved based on the feedback ...

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