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[aprssig] GPS interference?

KB0NLY kb0nly at mchsi.com
Thu Nov 24 16:00:58 UTC 2011


We had the same problem with the deluo GPS units. So much so that when we had a local repeater on 147.315 nobody could use it and aprs at the same time. We ended up changing the repeater to a new frequency.
73,

Scott KB0NLY 

-- 
Sent from my Android phone with K-9 Mail. Please excuse my brevity.

Steve Noskowicz <noskosteve at yahoo.com> wrote:

 

FWIW, 

My GPS-V puts out a pretty strong signal (spur) on 147.315, the frequency of a repeater in the Chicago area.  I could, but haven't put it on an analizer to look for more.


-- 
73, Steve, K9DCI USN (Vet) MOT (Ret) Ham (Yet)

--- On Wed, 11/23/11, Earl Needham <earl.kd5xb at gmail.com> wrote:

Just had another incident of the same, about 8 miles south of Melrose, New Mexico.  Since there isn't much there, on a hunch I decided to turn off the GPS-V.  IMMEDIATELY the truck computer found the sats again, so --

My GPS-V has an external amplified antenna on it.  It's about 7 or 8 years old, and has been through a lot of rain & snow.  Is itpossible the antenna has some corrosion somewhere, such that it might oscillate and cause interference in the GPS band?

Vy 7 3
Earl
KD5XB


On Wed, Nov 23, 2011 at 6:10 PM, Earl Needham <earl.kd5xb at gmail.com> wrote:

I can be fairly specific about where I had the problem in Denver -- I was on I-225, headed north, about a mile south of I-70. I guess I'll have to check a map to locate Federal Heights. 


Earl

KD5XB -- Earl Needham http://groups.yahoo.com/group/cw_bugs Quoting from the Coast Guard: ZUT Posted via Blackberry

_____________________________________________

From: david vanhorn <kc6ete at gmail.com> 

Date: Wed, 23 Nov 2011 17:48:49 -0700

To: <earl.kd5xb at gmail.com>; TAPR APRS Mailing List<aprssig at tapr.org>

Subject: Re: [aprssig] GPS interference?


I have a suspiciously low number of reports in the federal heights area, but other than that it looks ok.
This is an old Trimble yellow thing, not Earthmate, but similar.  Needed a mod to run from 12V and has to hear "ASTRAL" before it will work.


On Wed, Nov 23, 2011 at 5:39 PM, david vanhorn <kc6ete at gmail.com> wrote:

Interesting..  I can check my tracks.  I get thru Denver pretty often.
You know it's all our fault for using their spectrum for all these years, right? (wink wink wink)
 
BTW: I'd like to meet you in person one of these days..  :)  



On Wed, Nov 23, 2011 at 1:19 PM, Earl Needham <earl.kd5xb at gmail.com> wrote:

Anybody know if Lightsquared is testing in Colorado?

Last night, while driving the 18-wheeler up I25, my old Garmin GPS-V (for APRS) lost the sats 6 or 8 times -- in Trinidad, Pueblo, and Denver.  I first thought my GPS-V was dieing of old age -- but then I noticed the truck computer was losing the GPS signal at the same time. My Dezl 560LMT didn't seem to be affected.

I called my company this morning and they told me that some of our drivers had reported similar problems in the Southeast.

Anybody know what's going on?

Thanks,
Earl


KD5XB -- Earl Needham http://groups.yahoo.com/group/cw_bugs Quoting from the Coast Guard: ZUT Posted via Blackberry

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