VHF Radio Installation w/ Pics

[jhebert]

Re: VHF Radio Installation w/ Pics

Excuse me! Look in the mirror bud.

I don't understand your comment. You have suggested that my responses are not appropriate because you have judged them to violate some threshold that you have established regarding what can be discussed. I have not imposed any such limit on other participants.

 

[sweet addiction]

Re: VHF Radio Installation w/ Pics

I don't understand your comment. You have suggested that my responses are not appropriate because you have judged them to violate some threshold that you have established regarding what can be discussed. I have not imposed any such limit on other participants.

Yup you're right. I'm done. Have a nice day cupcake.

 

[jhebert]

Re: VHF Radio Installation w/ Pics

geez, thats my point. what you posted is the same thing I said before you posted.

I don't think you made your point very well. By not attributing that long passage you gave (without any quotation) it was not particularly clear who said it.

go pick on someone else.

You should not consider that you have been "picked on." When you quote the writing of someone else you should enclose it in quotation marks or otherwise indicate the source.

Again, if your point was to show you and I were saying the same thing, it is hard to make that point unless you attribute what I said to me, rather than to you.

And, by the way, I have not disagreed with your comments about measuring the resistance. However, you must agree, as demonstrated by the rather queer reply someone gave ("How could the resistance be less than 1-ohm") that there seems to be some confusion in the minds of boaters about resistance measurements of antenna inputs.

 

[jhebert]

Re: VHF Radio Installation w/ Pics

Yup you're right. I'm done. Have a nice day cupcake.

Is "cupcake" some sort of insult. I think you are trying to leave and make an insult on the way out. Why do you find it necessary to insult me?

 

[sweet addiction]

Re: VHF Radio Installation w/ Pics

:tape::tape::tape:

 

[sweet addiction]

Re: VHF Radio Installation w/ Pics

:facepalm:

 

[tpenfield]

Re: VHF Radio Installation w/ Pics

You never know where a thread will go as you post it. . . I guess radios are a hot topic.

This has been informative as I have some approaches to take in testing the radio installation, etc. I should probably test it periodically . . .

I am still looking for that box wrench, beacuse I am sure there will come a time when it is needed at the other end of the boat

 

[bruceb58]

Re: VHF Radio Installation w/ Pics

Never knew I could ask a queer question!

 

[sweet addiction]

Re: VHF Radio Installation w/ Pics

Never knew I could ask a queer question!

:rofl::rofl::rofl:

 

[jhebert]

Re: VHF Radio Installation w/ Pics

Never knew I could ask a queer question!

Your question, "How could [the measured resistance] be less than 1-ohm" seemed differing in some odd way from what is usual, as it seemed to suggest that resistance below a value of 1.0 could not be measured. This struck me as indicative of a misunderstanding of what the unit of resistance, an Ohm, actually is. Ohms are not some indivisible unit. It is quite common to have resistances less than 1-Ohm. To suggest otherwise seemed extremely odd and unusual.

M-W.COM defines "queer" as "differing in some odd way from what is usual." So I don't think there is anything odd or unusual about my usage.

 

[bruceb58]

Re: VHF Radio Installation w/ Pics

Your question, "How could [the measured resistance] be less than 1-ohm" seemed differing in some odd way from what is usual, as it seemed to suggest that resistance below a value of 1.0 could not be measured.

I am an EE with a masters degree. I know what the measurement of Ohm means. The question was why he was thinking he was going to be getting that low of a reading on a working antenna. I realize now he was checking for a shorted connector.

I still don't understand why my question is queer. Maybe more queer that you called it queer since I wanted to know why he was expecting less than 1 ohm. How would you phrase the question differently?

 

[tpenfield]

Re: VHF Radio Installation w/ Pics

Is there a Moderator in the house . . .

 

[tpenfield]

Re: VHF Radio Installation w/ Pics

Since this thread . . . now many of my Google "adchoices" are coming up with radio and PL-259 connector suppliers.

A few weeks ago, I couldn't even spell "PL-259" :noidea:

 

[sweet addiction]

Re: VHF Radio Installation w/ Pics

Since this thread . . . now many of my Google "adchoices" are coming up with radio and PL-259 connector suppliers.

A few weeks ago, I couldn't even spell "PL-259" :noidea:

HAHA!!! Oh geez. :laugh:

 

[NYBo]

Re: VHF Radio Installation w/ Pics

Is there a Moderator in the house . . .

I sure hope so.

 

[jhebert]

Re: VHF Radio Installation w/ Pics

The question was why he was thinking he was going to be getting [a 1-Ohm] reading on a working antenna. I realize now he was checking for a shorted connector.

Use of a shorted stub as an impedance matching device is rather common in VHF Marine Band radio antennas, and I think it is reasonable that the resistance measured would be very low. Of course, depending on the device being used to take the resistance measurement, it might be hard to get a reading below 1.0-Ohm unless the meter compensates for its own lead resistance. The shorted stub is sometimes made with a short length of brass tubing and the center conductor portion of RG-58C/U transmission line.

The reason I thought your questions was unusual was it seemed to suggest there was a lower bound for the DC resistance of an antenna. As I suggested, the DC resistance may be very low, less than 1-Ohm, and that may be completely normal for an antenna.

As you mention, such a low resistance might also be representative of a badly installed connector. As I suggest in my artlcle on this topic, a resistance check may be used to verify the connector installation but only if a previous measurement of the antenna DC resistance has been recorded so a comparison can be made. Just measuring the resistance cannot reveal much about the connector installation if there hasn't been a previous measurement made of the transmission line before installation.

 

[bruceb58]

Re: VHF Radio Installation w/ Pics

Use of a shorted stub as an impedance matching device is rather common in VHF Marine Band radio antennas,

True. Too be honest, I am a digital design engineer so the closest I get to calculating impedance is stripline on our SERDES lanes on circuit boards.

 

[tpenfield]

Re: VHF Radio Installation w/ Pics

I'll be testing the radio tomorrow to see if I am getting decent trx and rcv . . .

We shall see how it goes . . .

 

[tpenfield]

Re: VHF Radio Installation w/ Pics

I'll be testing the radio tomorrow to see if I am getting decent trx and rcv . . .

We shall see how it goes . . .

Quick update . . .

infinity ohms from the antenna lead to ground, so no shorts, etc at the connector . . .

I got the Cape Cod Wx station (15 miles away), and the Providence and Boston WX stations (about 50 miles away).

I tested the nearest SeaTow Automated Radio Check station (about 5 miles away) . . . it was not great, but audible, however the signal has some terrain to go through/up/over, etc. So, I should probably re-try once I am out on the water.

I think I'll start work on the engines now instead of the radio . . .

 

[sweet addiction]

Re: VHF Radio Installation w/ Pics

Quick update . . .

infinity ohms from the antenna lead to ground, so no shorts, etc at the connector . . .

I got the Cape Cod Wx station (15 miles away), and the Providence and Boston WX stations (about 50 miles away).

I tested the nearest SeaTow Automated Radio Check station (about 5 miles away) . . . it was not great, but audible, however the signal has some terrain to go through/up/over, etc. So, I should probably re-try once I am out on the water.

I think I'll start work on the engines now instead of the radio . . .

Congrats!! :joyous: