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Search found 5758 matches

by 'Doc
Friday, 25 April 2014, 8:58 AM
Forum: ANTENNA HELP
Topic: Field Antenna
Replies: 6
Views: 193

Re: Field Antenna

Has your radio been modified in any way? If not, then it's about as normal as it can get. I wouldn't worry about it a lot, really. You may not sound like anyone else, but you're doing about normal as far as output power is concerned.
- 'Doc
by 'Doc
Tuesday, 22 April 2014, 22:43 PM
Forum: JOKES & HUMOR
Topic: RedNeck holidays
Replies: 0
Views: 294

RedNeck holidays

This should work for almost any holiday,
not just birthdays...
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by 'Doc
Tuesday, 22 April 2014, 22:39 PM
Forum: GENERAL DISCUSSIONS
Topic: What wire can I use to extend my power cable?
Replies: 2
Views: 185

Re: What wire can I use to extend my power cable?

What size wire? That depends on how long of an extension you'd need. The longer the run the larger the wire to reduce resistance losses. What kind of wire? Very basically is should be insulated and fairly flexible. Almost anything you find at an automotive parts house should work. Solid wire is hard...
by 'Doc
Tuesday, 22 April 2014, 10:37 AM
Forum: ANTENNA HELP
Topic: Field Antenna
Replies: 6
Views: 193

Re: Field Antenna

I don't see any reason it couldn't be made to work.
- 'Doc
by 'Doc
Monday, 21 April 2014, 9:20 AM
Forum: ANTENNA HELP
Topic: My car install didn't go as planned
Replies: 9
Views: 346

Re: My car install didn't go as planned

The additional feed line length should have nothing to do with it. Sure, it'd affect it a little, but nopt to that extent.
- 'Doc
by 'Doc
Monday, 21 April 2014, 3:24 AM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: D&A PDX400
Replies: 13
Views: 392

Re: D&A PDX400

As old as that amplifier is and from the number of apparent modifications done to it, it'd be a very good idea to trace -all- the circuits to see what was done.
Personally, I don't think you got a bargain.
- 'Doc
by 'Doc
Monday, 21 April 2014, 3:21 AM
Forum: ANTENNA HELP
Topic: My car install didn't go as planned
Replies: 9
Views: 346

Re: My car install didn't go as planned

Actually, the original numbers indicate that the antenna is fairly well 'centered' between ch1 and ch40. By shortening it the SWR on ch40 went down but the SWR on ch1 went up. If you lengthened it then ch40 would go up and ch1 would go down. Seems like something else is affecting it, not the antenna...
by 'Doc
Monday, 21 April 2014, 3:15 AM
Forum: ANTENNA HELP
Topic: making a directional beam with 2 102" SS Whips
Replies: 7
Views: 405

Re: making a directional beam with 2 102" SS Whips

Yes, it'll work. Not real well, but certainly more directional than a single antenna.
- 'Doc
by 'Doc
Sunday, 20 April 2014, 19:20 PM
Forum: ANTENNA HELP
Topic: My car install didn't go as planned
Replies: 9
Views: 346

Re: My car install didn't go as planned

Is this a new antenna or one you've used before?
- 'Doc
by 'Doc
Sunday, 20 April 2014, 5:58 AM
Forum: ANTENNA HELP
Topic: The Imax 2000, and maybe some extra support
Replies: 9
Views: 311

Re: The Imax 2000, and maybe some extra support

It sounds like you don't plan to get the thing above the eaves of your house. That means that it's just not going to be exposed to much wind, so I doubt if any swaying would be a problem. Putting the antenna inside a PVC pipe means that you also have to deal with supporting that PVC pipe just to kee...
by 'Doc
Saturday, 19 April 2014, 18:14 PM
Forum: JOKES & HUMOR
Topic: Removing distractions?
Replies: 3
Views: 218

Re: Removing distractions?

Or maybe competition??
by 'Doc
Saturday, 19 April 2014, 18:12 PM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: matching amp impedance to radio
Replies: 5
Views: 348

Re: matching amp impedance to radio

That impedance matching device can be a tuner, a fixed circuit, same basic circuit. Most multiband amplifiers usually have a separate tuned input circuit for each band. They are slightly adjustable. Or, a smallish tuner placed between the amplifier and the transmitter will do the same thing. If you ...
by 'Doc
Saturday, 19 April 2014, 7:26 AM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: matching amp impedance to radio
Replies: 5
Views: 348

Re: matching amp impedance to radio

If the radio's output impedance isn't the same as the amplifier's input impedance you will have some SWR between the two. Getting those two devices to match isn't a bad idea at all. There are two basic ways of curing that mismatch, change the input circuit of the amplifier, or put an impedance match...
by 'Doc
Friday, 18 April 2014, 19:13 PM
Forum: JOKES & HUMOR
Topic: Removing distractions?
Replies: 3
Views: 218

Removing distractions?

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by 'Doc
Tuesday, 15 April 2014, 5:34 AM
Forum: ANTENNA HELP
Topic: double bazooka antenna By radiowavz
Replies: 13
Views: 604

Re: double bazooka antenna By radiowavz

Another fairly simple solution is to just make one yourself. Basically the cost of the coax used and some time to do some measuring and soldering. It really isn't that difficult.
- 'Doc
by 'Doc
Monday, 14 April 2014, 9:37 AM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: Adding a second battery
Replies: 22
Views: 572

Re: Adding a second battery

You're gonna love this... The battery in a vehicle is only for supplying enough power to start the engine. From there, the whole electrical system is powered by the alternator/generator (or should be ideally). The battery only is supposed to supply short, occasional, spurts of power when the source ...
by 'Doc
Monday, 14 April 2014, 9:28 AM
Forum: ANTENNA HELP
Topic: double bazooka antenna By radiowavz
Replies: 13
Views: 604

Re: double bazooka antenna By radiowavz

A double bazooka antenna is typically a 1/2 wave length at it's design frequency. There's some slight '+/-' to that, but it's a 1/2 wave antenna. If the actual length isn't something at least 'close' to a 1/2 wave length then it's not for that particular band. A bazooka antenna isn't 'miraculous' in...
by 'Doc
Monday, 14 April 2014, 9:22 AM
Forum: ANTENNA HELP
Topic: Coax length & pieces parts?
Replies: 5
Views: 277

Re: Coax length & pieces parts?

I may be misunderstanding what was said, but, an electrical 1/4 wave length (or any multiple there of) is just as susceptible to CMC as any other length of feed line. There's no 'magical' benefit to that length as far as CMC is concerned. If you happen to have some 'extra' feed line length and want ...
by 'Doc
Sunday, 13 April 2014, 20:25 PM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: Adding a second battery
Replies: 22
Views: 572

Re: Adding a second battery

I'm not sure I can say that 'PowerWerx' makes one.
- 'Doc
by 'Doc
Sunday, 13 April 2014, 9:23 AM
Forum: JOKES & HUMOR
Topic: Tank-tops
Replies: 0
Views: 281

Tank-tops

Now this is a real tank-top...
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And I got this nice soft fluffy towel...
by 'Doc
Wednesday, 09 April 2014, 15:04 PM
Forum: ANTENNA HELP
Topic: Grounding to tool box?
Replies: 8
Views: 200

Re: Grounding to tool box?

Very simply, no.
- 'Doc
by 'Doc
Tuesday, 08 April 2014, 22:32 PM
Forum: ANTENNA HELP
Topic: Grounding to tool box?
Replies: 8
Views: 200

Re: Grounding to tool box?

FWIW
"reverse modulation" is never the result of antenna or antenna 'grounding'.
- 'Doc
by 'Doc
Tuesday, 08 April 2014, 19:53 PM
Forum: ANTENNA HELP
Topic: Question about antenna degradation...
Replies: 9
Views: 298

Re: Question about antenna degradation...

Sounds like it might be time to change that coax cable. Keeping it sealed/'closed' really is important, things change with that sort of degradation. May not be a huge change though.
- 'Doc
by 'Doc
Tuesday, 08 April 2014, 19:45 PM
Forum: ANTENNA HELP
Topic: 2 102" whips as a dipole?
Replies: 11
Views: 586

Re: 2 102" whips as a dipole?

Will it work? Yep, sure will. One of the 'catches' is that you'll have to adjust the length to tune it, that's not always very easy with a 102" whip. Would it be better than a wire antenna? Not really, they would both be the 'same' antenna just in a different form. If you can mount that wire dipole ...
by 'Doc
Tuesday, 08 April 2014, 8:31 AM
Forum: JOKES & HUMOR
Topic: A 'Quicky'!
Replies: 0
Views: 237

A 'Quicky'!

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by 'Doc
Monday, 07 April 2014, 18:46 PM
Forum: ANTENNA HELP
Topic: Question about antenna degradation...
Replies: 9
Views: 298

Re: Question about antenna degradation...

It's not a bad idea to clean that antenna up a bit. The connecting points are the biggies, the surface isn't really a biggy except for 'looks'. After doing that 'cleaning' it isn't unusual to have to make some adjustments to get the thing in-tune again. Usually not any worse than when it was new, bu...
by 'Doc
Saturday, 05 April 2014, 20:45 PM
Forum: ANTENNA HELP
Topic: Question about SWR and external meter vs internal meter
Replies: 10
Views: 227

Re: Question about SWR and external meter vs internal meter

Yes it can.
- 'Doc
by 'Doc
Saturday, 05 April 2014, 19:32 PM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: RFX-75 ON COBRA 29 LXBT
Replies: 5
Views: 325

Re: RFX-75 ON COBRA 29 LXBT

The quick-n-dirty answer is that, no, you can't do anything with just an SWR/power meter. Just from the sound of it, it sounds like it wasn't installed correctly. Can it be corrected? No idea, but you'd better take it to someone who really does know what they are doing.
- 'Doc
by 'Doc
Saturday, 05 April 2014, 19:27 PM
Forum: ANTENNA HELP
Topic: need some antenna advice
Replies: 11
Views: 395

Re: need some antenna advice

What you are talking about is a basic two element beam, and yes, it would be directional. Not a lot of gain but certainly more than just a single dipole. There are a couple of requirements to get the most out of such an antenna. One of those two dipoles needs to be a little longer/shorter than the o...
by 'Doc
Friday, 04 April 2014, 10:05 AM
Forum: JOKES & HUMOR
Topic: A Mix
Replies: 0
Views: 268

A Mix

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Go ahead, I dare you...

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My gardener has a
green thumb, and
other things.
by 'Doc
Friday, 04 April 2014, 7:09 AM
Forum: ANTENNA HELP
Topic: No Ground Plane Antenna Help...
Replies: 25
Views: 761

Re: No Ground Plane Antenna Help...

:) If you find one'a them 'antenna stretchers', get two and give the other one to me! That wire 'extension' you made is the easiest way of making an antenna longer without making some huge or expensive modification, and it works just fine. Now all you have to do is figure a way of 'adding' that leng...
by 'Doc
Thursday, 03 April 2014, 10:20 AM
Forum: ANTENNA HELP
Topic: No Ground Plane Antenna Help...
Replies: 25
Views: 761

Re: No Ground Plane Antenna Help...

I have no idea what kind of coax cable you have, so, if it's a 50 ohm characteristic impedance cable it should work fine. How long does it have to be? It has to be long enough to get from the antenna to the radio with a little left over (couple of feet isn't going to make any significant difference....
by 'Doc
Thursday, 03 April 2014, 2:59 AM
Forum: MOBILE SETUPS
Topic: Radio causeing a short?
Replies: 13
Views: 308

Re: Radio causeing a short?

... and to cover the rest of those 'bases', try your buddy's radio in your setup. See what happens that way. I think you will find that there's something 'wrong' with your system.
- 'Doc
by 'Doc
Thursday, 03 April 2014, 2:53 AM
Forum: ANTENNA HELP
Topic: No Ground Plane Antenna Help...
Replies: 25
Views: 761

Re: No Ground Plane Antenna Help...

"Does this mean if I just change out the cable and throw on a SWR meter and ground the rail I have it mounted to, I will be golden?" You might be, but I wouldn't count on it. I probably missed the part about why you would want to change the coax, it there's a good reason for it, then change it. Any ...
by 'Doc
Tuesday, 01 April 2014, 13:07 PM
Forum: MOBILE SETUPS
Topic: Radio causeing a short?
Replies: 13
Views: 308

Re: Radio causeing a short?

The most probable cause of what's happening is the antenna/mount isn't assembled correctly, or maybe the connector you put on the feed line.
- 'Doc
by 'Doc
Tuesday, 01 April 2014, 8:17 AM
Forum: CURRENT EVENTS
Topic: What is the best cb antenna for a pickup
Replies: 11
Views: 582

Re: What is the best cb antenna for a pickup

Maybe this will help a little. Antennas would rather be above metal than beside metal. Why? It deals with several things, impedance matching (SWR) and radiation efficiency or resonance. Anything/everything around an antenna will affect it to some degree so if you can get the thing 'away' from stuff,...
by 'Doc
Monday, 31 March 2014, 1:41 AM
Forum: GENERAL QUESTIONS
Topic: filters
Replies: 4
Views: 205

Re: filters

A typical low pass filter (or a high-pass) won't 'cure' RFI. The only sure 'cure' for that is distance. That usually means that whatever is getting interfered with can also -be- the problem, everything isn't designed to handle strong RF. A low-pass filter shouldn't hurt anything but don't count on i...
by 'Doc
Monday, 31 March 2014, 1:36 AM
Forum: BASE SETUPS
Topic: Probably a silly newb question, but here goes...
Replies: 8
Views: 288

Re: Probably a silly newb question, but here goes...

Metal roofs do pretty good under an antenna (works on your truck, right?). Don't know about a mag-mount, depends on what kind'a metal roof it is. 'Hard' mount the thing, then you won't have to worry about it.
- 'Doc
by 'Doc
Sunday, 30 March 2014, 0:05 AM
Forum: TUBE RADIO EQUIPMENT
Topic: top of tube blowout
Replies: 10
Views: 737

Re: top of tube blowout

The 'quick-n-dirty' way of doing it is by shorting a screwdriver from the chassis to the tube plate cap. That's gonna 'eat' a speck out of the screwdriver blade, probably, but it's about the most common way of dong it. It's chasis contact FIRST, then the plate cap! Otherwise be prepared for a nasty ...
by 'Doc
Saturday, 29 March 2014, 1:33 AM
Forum: GENERAL QUESTIONS
Topic: a HAM with a new CB with some questions.
Replies: 15
Views: 409

Re: a HAM with a new CB with some questions.

Don't get too tied up with that 'swing' thingy, it's much over rated. Keep in mind that you are dealing with AM mode, not SSB too. Different modes have different 'needle wiggly', none are the same amount. Having too much 'swing' is as bad, if not worse, than hot having enough. It directly affects th...
by 'Doc
Saturday, 29 March 2014, 1:25 AM
Forum: ANTENNA HELP
Topic: Totally new to all this, but looking at a simple homemade
Replies: 5
Views: 374

Re: Totally new to all this, but looking at a simple homemad

"...the way i see it is they are mostly made all the same way as far as dimensions, but structually different." That's basically true. Length does play an important part in antennas because of it's electrical characteristics. The same basic 'style' or type of antenna are the same lengths to a close ...
by 'Doc
Wednesday, 26 March 2014, 18:55 PM
Forum: ANTENNA HELP
Topic: Neutralizing adjacent antennas?
Replies: 8
Views: 421

Re: Neutralizing adjacent antennas?

I'm afraid 'JJD' is right, your only resort would be to take'em down. They shouldn't have a humongus affect on antennas that far away, but will surely have some.
- 'Doc
by 'Doc
Wednesday, 26 March 2014, 7:56 AM
Forum: BASE SETUPS
Topic: My first base set-up
Replies: 11
Views: 411

Re: My first base set-up

At this point I don't think it makes a huge difference what antenna you decide on. I think any choice will work. Find something that is mechanically sound, won't fall apart, get bent, that sort of thing. And then you get to decide on a vertical omnidirectional antenna or a directional antenna. Those...
by 'Doc
Monday, 24 March 2014, 10:09 AM
Forum: JOKES & HUMOR
Topic: Animal Opinions
Replies: 0
Views: 254

Animal Opinions

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Image

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Coffee not ready?
by 'Doc
Sunday, 23 March 2014, 10:29 AM
Forum: JOKES & HUMOR
Topic: 2 Cows and a Chicken
Replies: 0
Views: 244

2 Cows and a Chicken

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by 'Doc
Thursday, 20 March 2014, 5:54 AM
Forum: BASE SETUPS
Topic: RM Italy KL 200P Mobile CW Transmitter
Replies: 26
Views: 2013

Re: RM Italy KL 200P Mobile CW Transmitter

:)
It's a 'black market' thing, if you can't (afford) to dazzle'em with brilliance then baffle'em with lower quality, double talked B.S. Sound familiar?
- 'Doc
by 'Doc
Wednesday, 19 March 2014, 16:49 PM
Forum: MOBILE SETUPS
Topic: Ok what am I doing wrong????
Replies: 11
Views: 430

Re: Ok what am I doing wrong????

Foliant, Yes you can match impedance with that device, it's an impedance matching device, right? It does the same thing a couple of section of 75 ohm coax does (conjugate matching), and probably has the same limitations too. The only benefit from using dual antennas is that they become directional t...
by 'Doc
Wednesday, 19 March 2014, 9:38 AM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: At what point does wattage have minimal gain? Clarity?
Replies: 14
Views: 596

Re: At what point does wattage have minimal gain? Clarity?

Something I wonder about, if a fan is required to keep the thing cool enough to live longer than one or two transmissions, why doesn't the manufacturer put that fan on there to start with? Extra cooling never causes problems, but not enough cooling always causes problems. Something a bit 'off' with ...
by 'Doc
Tuesday, 18 March 2014, 16:59 PM
Forum: ANTENNA HELP
Topic: Ant. for 136-174MHZ
Replies: 8
Views: 316

Re: Ant. for 136-174MHZ

I tried searching for that 'Tram' part number, couldn't find it. So, I have to think that it's a fairly 'simple' antenna if it has that '136-174Mhz' range. In most cases, that range is just the spread of frequencies that the antenna can be adjusted for, not that it will cover that whole range at one...