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I am getting good reception from my rhombic antenna aimed at a
transmitter group with a number of stations. However, I hear
static from the classical station that is main reason for the
antenna. For lack of a better description I would call it a
frying egg type of noise. I hear this for blocks of time most
days, other times I do not hear it. I have not come up with a
noise source in the house so far. I am using twinlead for
the downlead and will be changing to RG59 for the downlead. I do
not hear the noise on any other frequency. Specifically the noisy
frequency is 88.7MHz and on 90.5 I do not hear this. I have
also noticed that the 88.7 station will be off the air for an
hour or more several times a week.
Any thoughts on this? Do you think the rg59 downlead will make a
difference?
Follow Ups:
Always a good idea.Note that IF you have tried switching to mono and the noise didn't go away then it isn't caused by HD.
IF they do also broadcast in 'Hybrid Digital' - and it goes in mono. Then? I'd pay someone to add a sharper filtering regime to your tuner's RF/IF section to get rid of those sidebands so you can listen in stereo.
If it turns out - not - to be caused by HD - for either reason above - I'd also ask them are there any arc-lights near that antenna that faces towards your area. Why? IF the several transmitters are on a shared tower/s there are very likely some arc-lights which come on at night.
If any one of those is close to an antenna - and it's in decline - you will get crackle.
Warmest,Tim Bailey
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 01/25/14 01/25/14 01/25/14 01/25/14 01/25/14 01/25/14
I guess I'm a crackpot whiner. I should log the problems and times.
I don't expect the RG6 downleads will help with the noise, but they will plug into the 3 way antenna switch I have ordered. Also I will switch to
RG6 with F connectors for the 2 tuners I'm currently using.
;-)!
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Does your tuner have a signal strength meter? If so how do the readings vary between both times of day and other stations? Reception can change with conditions. Also what happens if you switch from stereo to mono? Is it quiet in mono? Switching to coax may or may not help. Coax will help with noise generated within your building but "generally" twin lead w/o a balun will get more of the signal to the tuner. Adding that switch may detract. Let us know what happens.
ET
Twisting the twin-lead could also help with shielding but it will shorten it a bit.It comes and goes? That's why I don't think it is your set-up.
See below.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 01/23/14
I mis-remembered. I have a 3 way coax antenna switch ordered
with F connector adapters. I'll pull the RG6 with the twinlead and cut to
fit. I want to clean up the hole in the wall that lets the antennas in.
And have a handy switch for the antennas. ( 2 rhombics and a dipole)
If the station is broadcasting in HD,,,Your tuner is picking up an artifact called SELF NOISE....
The station would have to be transmitting only occasionally with the HD stuff turned on, for it to be the cause.
I would think that was highly unlikely. Unless they are currently just testing it.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
To see whether they are broadcasting HD, contact the station or look at the web site below. If it is intermittent, they may indeed be testing or installing it. Good luck!
I used the national stations tab, and searched on 'All' and on 'Classical' - with no result.
I may not have exhausted the search options.
One of them could still be testing HD and hasn't yet committed.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
hdradio.com is out of date. Several listed stations in my area dropped HD years ago.
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