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Re: [RFI] Grow light RFI

To: rfi@contesting.com
Subject: Re: [RFI] Grow light RFI
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Fri, 2 Dec 2016 09:47:59 -0800
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Hi Scott,

I suggest that you get advice from ARRL and W1RFI on the wording of your ordinance. I suspect that they will advise you to avoid suggesting any specific products, and also that they will advise you to require compliance with Part 15 Class B for residential use. Or it may be that these products fall within Part 18.

73, Jim K9YC

On Fri,12/2/2016 5:30 AM, nm8rmedic via RFI wrote:
Ed,

Understood, and thank you.  The metodology is not my question, though.

I still ask: what was the lowest frequency swept?  I infer from the tiny graph 
it was around 300 khz, but did not catch any numerical data at that point or 
outside of the points you mention.

I ask b/c as a city manager we adopted an ordinance regulating marijauna grow 
operations and included a provision of local license approval based upon also 
meeting FCC regulations regarding RFI emissions.  We recommend an outboard 
filter for noisy ballasts, but I would like to also be able to make a 
recommendation for an effective and clean ballast from LF to VHF.

Is this the one?

Scott



Scott


Sent via the Samsung Galaxy Note® II, an AT&T 4G LTE smartphone



<div>-------- Original message --------</div><div>From: "Hare, Ed  W1RFI" <w1rfi@arrl.org> </div><div>Date:12/01/2016  4:14 PM  
(GMT-05:00) </div><div>To: nm8rmedic <nm8rmedic@rocketmail.com>, Tom Thompson <w0ivj@tomthompson.com> </div><div>Subject: RE: [RFI] Grow 
light RFI </div><div>
</div>It looks like they swept the entire frequency range with a spectrum 
analyzer in peak-detection mode, obtained the 6 highest values and frequency, then 
went back and measured just those frequencies in quasi peak detector mode.  This is a 
common test practice.

Ed, W1RFI



-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of nm8rmedic via RFI
Sent: Thursday, December 01, 2016 4:09 PM
To: Tom Thompson; rfi@contesting.com
Subject: Re: [RFI] Grow light RFI

Tom,

It looks like there were three test runs conducted. The tabular data shows the 
lowest frequency tested was 14 megahertz, in runs 1 and 2. The graphic data 
results show lower frequencies though. Can you verify the lowest frequency at 
which these were tested?  Scott


Sent via the Samsung Galaxy Note® II, an AT&T 4G LTE smartphone

<div>-------- Original message --------</div><div>From: Tom Thompson <w0ivj@tomthompson.com> </div><div>Date:12/01/2016  1:32 PM  
(GMT-05:00) </div><div>To: Roger D Johnson <n1rj@roadrunner.com>, RFI <rfi@contesting.com> </div><div>Subject: Re: [RFI] Grow light 
RFI </div><div> </div>Roger,

Here is an independent lab evaluation of a Galaxy ballast the may be a good bet.

http://tomthompson.com/radio/GrowLight/RFI_Tests_Galaxy_902220_FCC-Report.pdf

Tom   W0IVJ


On 12/1/2016 11:27 AM, Roger D Johnson wrote:
Is there a list of ballasts that Don't cause RFI?

73, Roger

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