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My 10m/20m buildout and installing the FTM400XDR.


kidphc
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The Burb decided to become damn near dangerous to drive. Most of the possibilities for repair were going to cost what I paid for the truck. So I gave up on her.

Enter 200 Land Cruiser.

Got the FTM 400 installed. However, on GMRS frequencies I get hash. Even with squelch all the way up it breaks the squelch. So far with the engine off all accessories on no hash. Engine running is when it occurs. I even took out the BF8hp and can hear it when the engine is running and all the ham gear (radio, power pole distribution and Cell phone chargers unplugged).  Was trying to use the BF8HP as a locator but eh probably not the best radio for it. So the noise is not entering through the power leads, since it can be heard by the Baofeng.

Kinda, lost as where to go to find the source of this noise. Never thought I would have to do a fox hunt on my truck.

Any suggestions.

 

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Does baofeng hear the hash with antenna removed? Maybe create a really poor receiving antenna out of piece of wire, that will receive the hash only when close to the source.
I'm curious, is the interference only in 462 MHz range, or on 70 cm as well?
Will try without the antenna. Only the gmrs frequencies. 70cm seams to be clear of the issue. Bounces around also so a chore to chase down.

Sometimes on channel 4 then channel 6 then it will be on 19 or 22. Killing me. Can be heard outside of the vehichle also with the radios.

Probably one of the modules probably a pwm module failing.

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Being GMRS channels are outside the amatuer band and the FTM is not certified for use I'd just use a dedicated GMRS radio . I dont seem to have that issue on RX only in my JT but YMMV.
 
It wouldn't matter if it is certified for gmrs when listening. The Baofeng gmrs v1 hears it as well.

It's more of trying to find the offending source of the rfi.

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Could be anything. Brake system, injectors, PCM, even just running lights. It could also be any screens (radio, dash, etc)
Can the noise be heard on a permeant installed antenna on the roof, or is it just an HT inside the car?
Both. Fender mount antenna, ht inside and outside the truck.

Might have to pull fuse to find the offending system. Think I might pull out the sdr to see the spectrum a bit better then chasing channels.

Oh. Sigh.



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  • 4 months later...
On 8/9/2021 at 8:57 AM, kidphc said:

Using stock, design the enclosure so everything was inside of 12" of each other.

Did you check to see if you have loose power connections?

Also make sure to run the firmware updates before install. I have been having issues with aprs, sometimes doesn't beacon. I see the packet in aprsdroid, just not on aprs.fi. starting to think it maybe a GPS lock issue on cold start.

The tarheel is what I had looked at for hf. Just with the controller and the antenna it would cost almost as much as say a ft917. So we'll outside of my budget especially as a tech with no hf privelages.

Would love a scorpion antenna, actually may die for one.....

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Figured out my issue with the APRS not beaconing. DISCLAIMER> I do not have the latest firmware update. I think it is about 2 years old. Yaesu makes it a pain to update. In the sense you need to open the radio and flip DIN switches. Currently, the way the body is mounted in the Land cruiser, it would take some time to get the radio out.

HERE IS THE SHORT FIX CURRENTLY. I simply remove ALL power from the radio for a few seconds. Luckily, I installed quick disconnect breakers on the power lines from the aux battery to auxiliary (fused power pole box) distribution box. Because reaching the andersons power poles beneath the radio would be just as bad as removing the radio.

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It's been a while. How did you fix your antenna bracket, and how has it been holding up?

 

I did a thing, Tarheel + Autocontroller + IC-705 got added to the wife's vehicle for vacation and trips.

 

PXL_20220430_181838836.jpg

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It's been a while. How did you fix your antenna bracket, and how has it been holding up?
 
I did a thing, Tarheel + Autocontroller + IC-705 got added to the wife's vehicle for vacation and trips.
 
PXL_20220430_181838836.thumb.jpg.4eb3811893a784be657a6162286469f0.jpg
Bought a newused truck. A 2000 landcruiser. Been swallowing all my time.

Tough moving all the radio gear and such over. It is so much smaller then the burb, with very little space to mount anything.

Congrats on getting the tarheel installed.

Switched to a Comet 2x4sr, on Marc's comments about the antenna. Probably going to switch the pod light and antenna location. The Larsen was better on the inside and got less interference on the GMRS frequencies there.

Bit bummed the wife bought me a Hustler 102" whip and hd spring. Had to return it, turns out the hatch mount was designed for 3-4 ft fiberglass whips. The mount is fine front to back but rocks side to side. So I think a 102" might be asking for torn sheet metal.a6d4bf640fc12666eeeed415a751aa69.jpg2f3794a49722bacfee0eff08a0f8241e.jpg

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