Big Truck Radio 12V Source Upgrade

[slowmover]

This monster ferrite is one I obtained from Palomar to quiet a portable NORCOLD 12V refrigerator/freezer that — when the compressor kicked in — completely blanked RX. (Zero, Nada, as if the radio had failed).

Didn’t matter if I ran it on 12V or from the inverter on 120VAC.

That’s about 11-12/turns, the maximum I could allow.

Barely heard it afterwards.

CORNELL-DUBILIER and NEWMAR are industry sources for various applications of devices to treat RF offenders.

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[slowmover]

Post in thread 'New to CB and New to the Forum...'
New to CB and New to the Forum...

A post much too good not to include.
Any mobile installation.

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[slowmover]

3% Volt Drop is maximum allowable.

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[W8HDU]

View attachment 179749
3% Volt Drop is maximum allowable.

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Never forget when a new employee tried hooking up a 60 watt mobile with lamp cord (18g). Could not figure out why things dimmed when the radio went to transmit. I had to explain to him the resistance with amp draw.

 

[slowmover]

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[slowmover]

I’ve learned with big trucks:

30A @ 25’ total circuit length
6-AWG

Runs a mobile radio rig pulling a temporarily steady 20+ Amps just fine. Leaves room for resistance hiccups (ambient heat, splices, etc). Length isn’t always this great, but “Six” will get the job done somewhat shorter & longer.

“Six” is also easy to work with unlike anything larger.

In the same way:

100-150W per antenna (mobile) gets the RX/TX “equal distance match” done given NRC-radio.

I use this as goal. Might get over/under on either, but it’s million-mile true for reliability over time.

3% = 1/2V

Quiet. The truck doesn’t know it’s there.

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[slowmover]

Didn’t take notice that an Iowa-Class DC Noise Filter was hidden in these pages:

Chasing ignition noise! Anybody up for helping me diagnose?

I think you may have this backwards. My factory plugs are “R” plugs. No, worked in automotive industry for 15 yrs, not backwards. Around the early 80's or before due to engine management and better circuitry R type plugs were not in the vehicles from the factory. For the Op's application...

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Impressive, @prcguy.

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[prcguy]

Didn’t take notice that an Iowa-Class DC Noise Filter was hidden in these pages:

Chasing ignition noise! Anybody up for helping me diagnose?

I think you may have this backwards. My factory plugs are “R” plugs. No, worked in automotive industry for 15 yrs, not backwards. Around the early 80's or before due to engine management and better circuitry R type plugs were not in the vehicles from the factory. For the Op's application...

forums.radioreference.com

Impressive, @prcguy.

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It’s only got an 8.3 Farad capacitor across the choke, what’s the problem?

 

[slowmover]

It’s only got an 8.3 Farad capacitor across the choke, what’s the problem?

There’s more THERE there than I’m used to seeing. Plus your quote “nothin gets past”. Kinda big for mobile, but I’ll bet someone will want to try to duplicate that.

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[prcguy]

There’s more THERE there than I’m used to seeing. Plus your quote “nothin gets past”. Kinda big for mobile, but I’ll bet someone will want to try to duplicate that.

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I don’t use it mobile as I don’t have any noisy vehicles. I built it mainly because I had the parts laying around. Just another one of those things here looking for a purpose.

 

[slowmover]

View attachment 166644

This monster ferrite is one I obtained from Palomar to quiet a portable NORCOLD 12V refrigerator/freezer that — when the compressor kicked in — completely blanked RX. (Zero, Nada, as if the radio had failed).

Didn’t matter if I ran it on 12V or from the inverter on 120VAC.

That’s about 11-12/turns, the maximum I could allow.

Barely heard it afterwards.

CORNELL-DUBILIER and NEWMAR are industry sources for various applications of devices to treat RF offenders.

I’ve had the above to contend with. In the truck, but not of it.

I’ve also wind of a project where what’s below isn’t up to the task.

 

[jcrmadden]

I’ve also wind of a project where what’s below isn’t up to the task.

🙋‍♂️

 

[jcrmadden]

"...my ultimate DC line filter I built from scratch using a 40 amp rated 41.7uh choke and an 8.3 Farad 16 volt capacitor as a choke input filter with overvoltage and spike protection. Nothing gets through that filter and it has four 45A Anderson Power Pole connectors on the output side and a 40A aircraft circuit breaker."

Can you make it bigger?

 

[slowmover]

https://www.repeater-builder.com/antenna/site-stuff/are-fifty-six-mobile-man.pdf

 

[slowmover]

https://www.repeater-builder.com/antenna/site-stuff/are-fifty-six-mobile-man.pdf

 

[RFI-EMI-GUY]

https://www.repeater-builder.com/antenna/site-stuff/are-fifty-six-mobile-man.pdf

Thanks!

 

[slowmover]

Associated truck thread:

Say Again Driver...

Couldn't quite make out what you said...

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