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Old 05-17-2016, 08:29 PM
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Rezarf Rezarf is offline
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Default Eliminating white noise on my mobile

I got to contact Nakman the other night, we live max 2 miles apart on my mobile unit in the 100 to his 100% working system on his 100. Our transmission was filled with "noise" in the background.

I swapped antenna for another both Comet antennas (SBB5 & SBB1) on a Diamond NMO mount.

I get similar noise when monitoring on the road. Also, no one Has responded to my contact attempts which could be 100% user error, but I'm using Brian's old radio with his memory channels and I can hear people fine.

My first guess is it is a grounding issue? I'm going to add a grounding strap from my lift hatch to the main body as maybe Toyota's hinges are so good they don't ground well

Any tips would be great.
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Old 05-18-2016, 11:37 AM
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Drew, you may first want to try hooking your HT up to your mobile antenna and see what you hear. This way you can isolate the tranciever v. the antenna system and see which component the noise follows.

Last fall while out with Tim I decided I had some problems as I couldn't hear him where I thought we should have it easy. In Moab, I was across a small valley and Tim and Terry could both hear me but I could not hear Tim so Terry was relaying for him (they were with a trail group and I was buggin out for the raffle). Just trying to say that you need to get a good feel with several other users or it can be hard to nail it down. So many directional and reflection issue come up. Maybe you could call into a repeater with both your radios while listening on the computer (broadcastify or similar) and see what you hear that way until you have another fixed contact to talk to? I generally find the repeaters are a good measure as they have such great receivers and coverage it's also pretty easy to get a response on the Colorado connection vs simplex. When I first started I also thought my stuff didn't work because I almost never got a simplex response.

Grounding can only help and you should do that either way.
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Old 05-18-2016, 11:54 AM
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Is the noise present only with the engine running or is it there regardless of the engine running? If it's there with the engine on does it change with engine speed?

A recording would be highly useful.

Would you call it pulsing, static, white noise? Does the noise ever go away? What is the received signal strength (indicated by the S-meter bar)?

Have you tried listening to the NOAA weather stations? One of them will be very strong and is a good omnipresent way to test your RX.

They are 162.400, 162.425, 162.450, 162.475, 162.500, 162.525, 162.550. In Denver you should get 162.550 (Glendale) or 162.500 (Deer Trail) but 162.475 (Longmont) may be very strong for you. If none of these are received with low noise and at least S7 or higher then you have an antenna issue for sure.
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Old 05-18-2016, 10:17 PM
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It is just background hiss. Sounds like a weak signal, but you can tell the signal is strong there is just the qrn.. I think it's an antenna/HT issue.
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Old 05-24-2016, 05:59 PM
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Yeah, I might need to have someone else look over my shoulder on this one. I just picked up some ground strap and I am going to try that first. My hand held Yeasu is clear as a bell on transmissions so that is what got me thinking. Well, that and Tim said my radio sounds like crap
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My rig... "Maude"
1976 FJ40 with some stuff and some leaks

My 100 Series Land Cruiser Build Thread

My camping trailer build up thread.

2012 Toyota Sienna Minivan, fastest Toyota in the stable.


"You 80 guys are just a Sawzall away from nirvana." -Red Chili
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Old 05-24-2016, 06:00 PM
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Is the HT clear through the same external antenna?
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Old 05-26-2016, 02:24 PM
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Hey Drew, I heard last Saturday morning there is a Simplex Net, run by a guy in Broomfield actually, on Wednesday evenings at 7:30. I forget the frequency.. in the 145-147 range though I bet you could scan for it. But it sounds like he's the man in terms of on air diagnosis, and usually has a topic of interest to share also. I couldn't do it last night, but will try to catch it in the future.

if you want the frequency, it was announced during the Preparedness net on the Colorado Connection, which is Saturday mornings at 9:30, 145.310 if you're on the front range. I suspect it will be announced again this weekend.
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  #8  
Old 06-08-2016, 09:44 AM
leiniesred leiniesred is offline
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Default 146.550 Wednesday nights at 7:30

It is a preparedness simplex net usually hosted by K0BUM on Wednesday nights at 19:30 local time. 146.550 FM phone.

The 'net starts out with an equipment check opportunity. VERY useful to see if you have made things better or worse. Usually you will get a signal report back from about 5 guys around the area.

Typically, I hear folks between Bailey-Aurora, Boulder-Castle Rock.
Sometimes Cheyenne,WY will check in and Simla, CO out east.
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