Noise blankers also target broadband noise. If some computer is dumping right
on your intended receive frequency, you're out of luck.
73,
Paul, AE4KR
----- Original Message -----
From: Chuck Kelsey
To: Repeater-Builder@yahoogroups.com
Sent: Monday, August 30, 2010 3:10 PM
Subject: Re: [Repeater-Builder] DB212-3
The radio I'm using in the mobile is a GE Orion with a noise blanker.
However, a noise blanker is designed to help with impulse-type noise.
Microprocessor hash and similar noise sources are continuous, so I doubt a
blanker is very effective. The problem, in my mind, is the huge increase in
this type of noise compared to 20 or 30 years ago.
Chuck
WB2EDV
----- Original Message -----
From: Oz-in-DFW
To: Repeater-Builder@yahoogroups.com
Sent: Monday, August 30, 2010 5:00 PM
Subject: Re: [Repeater-Builder] DB212-3
On 8/30/2010 2:08 PM, Chuck Kelsey wrote:
Doug, what were the State Police using for mobile radios back when you
were involved? I'm finding that the newer, wider front end, radios don't hear
as well as the old 0.5-1 MHz wide receivers did. I can hit my 6-meter repeater
full quieting, yet sometimes can hardly hear it due to mobile environment noise
that you can't avoid driving past (computers, LAN equipment, etc., etc.)
Chuck
WB2EDV
I'll bet 99-44/100% of this is the lack of an effective noise blanker. I
was running a LB SyntorX 9000 at the peak of the last cycle and it ran rings
around everything else. It ran FULL band 10 and 6. Bench sensitivity of all
the radios were pretty close, but the moto mobile noise blankers were a major
(>> 10 dB) advantage. I'll bet those 'old' radios have good noise blankers.
--
mailto:o...@ozindfw.net
Oz
POB 93167
Southlake, TX 76092 (Near DFW Airport)
