SDS100 Extreme Noise on UHF & VHF While Driving

[royldean]

Something to consider for "moving only" rf - TPMS sensors. They only start Tx'ing when the car is moving.

 

[Ubbe]

If they have RF transmitters they also have batteries and need battery save technology and then they only transmit if they sense a change in preassure or temperature after the initial transmit when the wheel start turning after a parking period.
I.E. a short RF burst when you start rolling and then nothing until something happens with the tyre.

But it could be some sort of sensor as those give pulses like a machine gun when the wheels start to roll.

Good to know that the analog audio are clearer from the SDS100 than other scanners but that might also make you notice all the little things in the audio that you had difficult in hearing with other scanners. Jack up the driving wheels and put the car in drive and secure the other wheels and try and pinpoint the source using AM mode on your scanner and then evaluate if there is a solution to the problem or if it's best to just getting used to it.

/Ubbe

 

[srpawski]

Attached are pictures of the window mount antenna units I was talking about a couple days ago. The one with the SMA antenna and adaptor is an MFJ-310S. It is intended for amateur radio HT broadcasting. The other with the BNC adaptor is the Opek AM801. Note that both units come in BNC and SMA versions. The Opek is tagged for scanner use, however, I would feel that either the MFJ or the Opek could be used interchangeably for receive with a scanner and HT broadcast.

MFJ is right and Opek is left hand

 

[Robertolson]

Today was my first day taking the SDS100 mobile in my big rig, Los Angeles to San Diego and back to L.A . I noticed San Diego CHP was noisy / static transmissions, which I found to be odd, because San Diego CHP normally comes in Crystal clear with all my other scanners.

tomorrow will be day 2 , by the end of the week I will have 900 MILES on my new sds 100, just love the display screen and 99 quick keys.

 

[richee2000]

i just got my SDS100/// p25 trunking sounds GREAT! , but... analog sounds horrible ...audio very tinny, way too much treble....and much noise with every transmission....unless its full quieting.... MY 436/536 sounds SO much better on all analog channels.. very unhappy with this.. but thrilled with the p25 performance. Any Ideas? Help?

 

[jasonhouk]

We're you running on battery or external power source?

Houk

i just got my SDS100/// p25 trunking sounds GREAT! , but... analog sounds horrible ...audio very tinny, way too much treble....and much noise with every transmission....unless its full quieting.... MY 436/536 sounds SO much better on all analog channels.. very unhappy with this.. but thrilled with the p25 performance. Any Ideas? Help?

Sent from my Moto G (4) using Tapatalk

 

[richee2000]

Running on Strictly battery power and it's happening in my home... And walking around...

Sent from my SM-N960U using Tapatalk

 

[maus92]

Reading people's problems with VHF/UHF, I'm relieved that just about every public safety entity in the Baltimore / Washington megalopolis and surrounding suburban-to-rural counties are some flavor of trunked P25 700/800 simulcast systems - the SDS100 works fantastically on those system types. I've never had a reception-related issue that wasn't either a system issue or operator error, while mobile or at home. Basically my experience mirrors the notion that this radio was optimized to perform on simulcast systems, and particularly in the 700/800 public safety band. If your area doesn't have *a lot* of these systems (like my area,) you might be better off with a 436. Note that the 436 did not work well for me, but the 536 does a good job decoding in a stationary operational environment with a stock antenna.

 

[pb_lonny]

My work van is really band in the 156-174MHz band, to the point that I have a bank on my UBC126AT of just the frequencies that work with CTCSS tones, just for when I am driving my van.

 

[scanmanmi]

This may be a dumb question but have you tuned close around that station's freq with the squelch completely off? May be birdie or other signal interferring?