I thought I would start a discussion about hiss. Assuming an electrically quiet location away from manmade sources of electromagnetic interference I have noticed significant difference in noise pick between my Gain Master and my IMAX2000 (no radials)
When I use the IMAX2000 I notice the noise floor is higher by some margin. I still have a S0 noise floor like the Gain master but I find the hiss level is much louder on the IMAX meaning that I do not need to have the volume up as high as the Gain Master to experience the same noise level.
I imagine that RX hiss is simply listening in to the background radiation of energy from in essence the universe. I imagine much born from stars and endless decay of electromagnetic ejection of "space bodies"
So I am trying to understand if simply the IMAX2000 is a more efficient receiver of all signals or just noise.
I find something in this article of interest and have never seen anything written about this before.
http://www.copperelectronics.com/discus4/messages/7750/20506.html?1023340740
"Since most man-made interference received during the day is sky-wave, and usually high angle sky-wave, an Imax 2000 with the GPK installed will likely experience the 'noise floor' reduced by as much as 12 dB. This is quite significant if you are trying to carry on local communications when sky-wave noise is very high."
After mentioning this perceived different in hiss RX between the GM and the IMAX2000 a French station that I spoke to suggested it was because the IMAX was a signal hoover and was very good at RX. I said I felt the GM was also a very good antenna (responsible for my most distant and impressive contacts) and seemed to have a quieter RX. It made me think could it be the IMAX has a much better RX or is it just a better transducer of some form of noise ?
I would like opinions and educated responses related to RX of noise of 2 antennas of comparable size. i.e. 5/8 wave long one being a ground plane type (or at least a basic radial less 5/8 wave) and the dipole like GM.
Could it be the IMAX does have a 6-10 dB (estimated by ear) better receive (highly doubtful) or does it just pick up this sky born man made noise or just general "cosmic" noise better than an IMAX. I cannot recall what some of the plots Marconi/The DB has made for the GM and IMAX and whether they relate to those in this web page with regards to this pick up of noise. I have seen some horrendous looking IMAX2000 plots with very high angle lobes when a bad mast and coax length is chosen which badly effects the pattern due to high CMC presence (though I understand it could not be replicated here by the 2 best know antenna modellers The DB and Marconi)
I hope this is of interest.
When I use the IMAX2000 I notice the noise floor is higher by some margin. I still have a S0 noise floor like the Gain master but I find the hiss level is much louder on the IMAX meaning that I do not need to have the volume up as high as the Gain Master to experience the same noise level.
I imagine that RX hiss is simply listening in to the background radiation of energy from in essence the universe. I imagine much born from stars and endless decay of electromagnetic ejection of "space bodies"
So I am trying to understand if simply the IMAX2000 is a more efficient receiver of all signals or just noise.
I find something in this article of interest and have never seen anything written about this before.
http://www.copperelectronics.com/discus4/messages/7750/20506.html?1023340740
"Since most man-made interference received during the day is sky-wave, and usually high angle sky-wave, an Imax 2000 with the GPK installed will likely experience the 'noise floor' reduced by as much as 12 dB. This is quite significant if you are trying to carry on local communications when sky-wave noise is very high."
After mentioning this perceived different in hiss RX between the GM and the IMAX2000 a French station that I spoke to suggested it was because the IMAX was a signal hoover and was very good at RX. I said I felt the GM was also a very good antenna (responsible for my most distant and impressive contacts) and seemed to have a quieter RX. It made me think could it be the IMAX has a much better RX or is it just a better transducer of some form of noise ?
I would like opinions and educated responses related to RX of noise of 2 antennas of comparable size. i.e. 5/8 wave long one being a ground plane type (or at least a basic radial less 5/8 wave) and the dipole like GM.
Could it be the IMAX does have a 6-10 dB (estimated by ear) better receive (highly doubtful) or does it just pick up this sky born man made noise or just general "cosmic" noise better than an IMAX. I cannot recall what some of the plots Marconi/The DB has made for the GM and IMAX and whether they relate to those in this web page with regards to this pick up of noise. I have seen some horrendous looking IMAX2000 plots with very high angle lobes when a bad mast and coax length is chosen which badly effects the pattern due to high CMC presence (though I understand it could not be replicated here by the 2 best know antenna modellers The DB and Marconi)
I hope this is of interest.