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Re: [RFI] Automobile RFI

To: Diane and Edward Swynar <deswynar@xplornet.ca>
Subject: Re: [RFI] Automobile RFI
From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Fri, 17 Dec 2010 15:38:45 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>

On 12/17/2010 3:15 PM, Diane and Edward Swynar wrote:
> Hi Roger,
> Your experience with automobile interference is certainly a far cry from
> days of old, when we got our first television set (i.e. 1957)...
Ah, yes that sure brings back memories.
Remember what those things cost.  Early sets were several thousand 
dollars.  In today's dollars that'd get you a 60" wide screen, home 
entertainment center AND a top end computer.
> Every time a Ford would cruise past our house, the picture would get all
> staticky,&  there'd be a raucous noise coming out of the TV's speaker in
> sync with the revving of the engine...!
I drove one of those Fords, but to make maters worse it had a "full 
house" under the hood.
That thing could block out the video and sound from a quarter mile away. 
Course you could hear the exhaust farther than that<:-))  The thing 
sounded like a Johndeer tractor at idle. Course I now have an old 
airplane (even older) from 1959 with a 471 Cu in 6 cylinder, 260 HP 
engine that sounds the same other than there is no ignition noise and 
not nearly as loud.
> As kids we'd jump up&  look out the window to confirm the make of the
> 4-wheeled culprit---but after awhile, we'd simply shout out in unison,
> "Ford!" until the RFI had thankfully gone up the street...
> I guess they never used shielded ignition / spark cables in those vehicles
> back in the day...
They did in the 50's but it was common for people to remove the resistor 
wiring harness, resistor plugs and go with HV wire and regular plugs.


Roger (K8RI)
> ~73~ de Eddy VE3CUI - VE3XZ
> ****************************************
> ----- Original Message -----
> From: "Roger (K8RI)"<k8ri@rogerhalstead.com>
> To:<rfi@contesting.com>
> Sent: Friday, December 17, 2010 3:07 PM
> Subject: Re: [RFI] "Inverter Technology" microwave ovens
>> On 12/17/2010 2:34 PM, KD7JYK DM09 wrote:
>>> : makes for lighter less expensive power supplies and I do have a light
>>> : weight microwave oven of several years. It may very well have an
>>> : inverter power supply.
>>> The transformer in my last microwave could provide 7.6KV @ 1A, these new
>>> inverters must be pretty hefty!
>>> : As an aside. A friend does county hunting from a Honda hybrid. I asked
>>> : about the RFI from the motor control. He said it is manageable. He
> does
>>> : operate his HF rig while in motion.  I have yet to talk to a HAM who
>>> : owns a Toyota hybrid or all electric who can operate an HF radio in
>>> I work with Class C Telemetry on HF and I can hear those %#(*&%(*%!!!
>>> Toyotas for a quarter mile radius, heck, they can be on the next block
> and
>>> wipe me out!
>> I don't operate HF from it, but My wife's Prius gets parked right under
>> one the 75 meter dipoles. Before the balun failed (and I could use the
>> antenna) I never heard a peep out of that car, when started, backing
>> out, or coming in. I hear nothing on 40 as well but the only antenna I
>> have working right now is in the back yard (bout 50 - 75 feet more
>> distant)   Having operated HF mobile in the past I realize that even
>> close to the antenna is not the same as operating *from* the car. OTOH
>> we live about 300 feet from a very busy road and I've never noticed
>> anything from traffic on 75 or 40.
>> 73
>> Roger (K8RI)
>>> Kurt
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