Coax Cabels and Earthing Cabels

[A71AN]

I have all of the coax cabels and the earthing cabels running into my room tied together, I used a cabel tie in order to avoid cabels running all over the place, do they cause RF problem, or feed back ?

Would also this be on a specific band while other are not effect , for example like the 20M, only ?

Would also this be more serious when the Processor is switched on and less other wise?

I have been told this morning that my voise on 20 is not very clear and it did improve by switching off the processor.

I also notice this when I am on transmitting mode, I hear some sort of noice, like electrical noise when some of your equipment is not been clean or dusty.

This was also using the yagi antenna and not the CP-6 vertical, and only on 20 meter where I had all of the problem before.

This was also creating the TV sorround amplifier picking up my transimssion very loudly which I have discconected and removed from the next room to my place.

I have a note book on the same disk of my radios, did remove it away but no changes noticed.

I have 3 other PC'S on the other side of the same room of my radios and 3 different LCD'S, is this also a risk of RF problem ?

Thank you all

73

[ky5u]

First, there is a section on QRZ for these these questions (http://www.qrz.com/ib-bin/ikonboard.cgi?act=SF;f=5). This is a forum for Opinions on topics.

But to try to answer your question, NO there is no problem bundling ground and coax cable together. The first question back to you is do you have any of the ferrite type beads on your coax cable? You can buy them at most Amateur dealers and they are little pieces of a ferrite material that clamp around your antenna coax to block RF. Two or three on the coax end that comes into your shack should help. A lot of people also use several loops of coax at the antenna end as a choke. I use about 5 coil loops on my antennas. I Don't know if it really helps but it doesn't hurt.

Next, how do you know your transmit audio has a noise on it? What are you using to monitor?

[A71AN]

Quote[/b] (AG4YO @ Dec. 07 2007,03:27)]First, there is a section on QRZ for these these questions (http://www.qrz.com/ib-bin/ikonboard.cgi?act=SF;f=5). #This is a forum for Opinions on topics.

But to try to answer your question, NO there is no problem bundling ground and coax cable together. #The first question back to you is do you have any of the ferrite type beads on your coax cable? #You can buy them at most Amateur dealers and they are little pieces of a ferrite material that clamp around your antenna coax to block RF. #Two or three on the coax end that comes into your shack should help. #A lot of people also use several loops of coax at the antenna end as a choke. #I use about 5 coil loops on my antennas. #I Don't know if it really helps but it doesn't hurt.

Next, how do you know your transmit audio has a noise on it? #What are you using to monitor?
First of all, thank you for your repsonse

Second I do not have the ferrite type beads, I heard of them for the first time.

This morning my friend on the same frequency told me there is very strange auido with my transmission but for a while now, I hear some sort of hashing noise when I transmit, its along with the transmission, just now on 17 meter and a different antenna, I also heard like a repeat for my cw sending, slight but like a noking of a dram.

Thank you
73

[VK2AKG]

Quote[/b] (a71an @ Dec. 07 2007,10:13)]I have been told this morning that my voice on 20 is not very clear and it did improve by switching off the processor.

I also notice this when I am on transmitting mode, I hear some sort of noise, like electrical noise when some of your equipment is not been clean or dusty.

This was also using the yagi antenna and not the CP-6 vertical, and only on 20 meter where I had all of the problem before.
(1) many people overdrive speech processors. IMHO their utility is somewhat exaggerated.

(2) possibly your "electrical noise" is arcing within the final or tuner due to maladjustment or attempting to match an impedance well beyond design limits (eg output pi coupler flash over when end feeding a half wave wire)

[n4bfd]

How high from the ground is your radio station? How far to actual ground in height?

[ky5u]

Well you have the experts helping you now. Good luck.

[K9STH]

The problem with grounding cables is that they have to be very short in relation to the wavelength of the signal. Anything that even approaches a quarter-wavelength places the equipment "way" above ground and that can cause all sorts of problems.

On the 17 meter band a quarter-wavelength is going to be just over 4 meters long and that means that your ground lead is going to have to be much shorter than 4 meters long to get a good ground. In the "real world" this means a length of probably no longer than 2 meters. For the 10 meter band a length of 2 meters is pretty close to a quarter-wavelength and will cause problems. That means a length of about 1 meter or less.

There are ways to have longer lengths for your ground including use of what in this country is called "flashing" (a wide width of metal usually aluminum or copper) which is used when buildings are "roofed" (means have the roof material installed). For some examples of this go to

http://k9sth.com/Page_2.html

and scroll down to the heading "Grounding Articles". There are instructions for getting a good r.f. ground in the first four articles.

Glen, K9STH

[VK2AKG]

Quote[/b] (AG4YO @ Dec. 07 2007,18:50)]Well you have the experts helping you now. Good luck.Golly Charlie, I thought he had that support from the very first answer - yours.

I note that your earlier question to him Quote[/b] ]Next, how do you know your transmit audio has a noise on it? What are you using to monitor? has not yet been answered. I assumed that Quote[/b] ]I hear some sort of noice, like electrical noise when some of your equipment is not been clean or dusty. meant that he could hear it with his unaided ears (viz sound in the shack not necessarily on his transmission). It would be nice to have that clarified.

73 Frank

[A71AN]

Quote[/b] (n4bfd @ Dec. 07 2007,08:45)]How high from the ground is your radio station? #How far to actual ground in height?
Good morning my friend.

The station is around 8 meters above the ground, in the second floar, the antennas around 14 meters for the yagi and the vertical is around 16 meters. I could not have more hight for the antenna than this because I only used to pieces of the tower, the other 2 pieces I like to use them for 30 meter antenna

Thank you my friend, best regards to you and yours.

73