Good Sam Club Open Roads Forum: Tech Issues: RF getting into Winnebago Furnace!!
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > RF getting into Winnebago Furnace!!

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
whizbang

Kenmore, WA

Senior Member

Joined: 08/20/2003

View Profile



Good Sam RV Club Member


Posted: 10/23/21 11:49am Link  |  Quote  |  Print  |  Notify Moderator

I have a Hi-Q antenna mounted on the ladder of a 24 foot Winnebago Minnie. Keying up 17 meters at 100 watts momentarily starts the RV's furnace, even with the furnace in the off position. The other bands seem to be okay.

Obviously, I need some combination of ferrites, shielding or grounding. I took the outside cover off the furnace, but, I am stumped and have no idea where to begin.

(FYI -- This is my second RV installation. 13 years ago, we had a 38 foot diesel pusher with an aluminum framed body. I ran 400 watts on 80 thru 10 meters. Good matches and no RFI. Our Minnie Winnie has a wood frame. I have poor matches and RFI to the furnace. The installation on both is identical --- chokes and bypass capacitors at the screwdriver motor feeds and plenty of clip on chokes. The Minnie install initially had good matches on 40 and 80, but 20meters and up were 3:1 SWR or worse. I added a shunt coil. 20 Meters thru 12 meters are now 1.2:1, but 40 and 80 are useless (and I don't care. The antenna is too short for 40 and 80 anyway.)

Suggestions???


Whizbang
2002 Winnebago Minnie
http://www.raincityhome.com/RAWH/index.htm


MT BOB

Montana

Full Member

Joined: 03/02/2021

View Profile


Offline
Posted: 10/23/21 03:12pm Link  |  Quote  |  Print  |  Notify Moderator

Don't do HF on the road, but I would say ferrites and perhaps chokes on the furnace power wires, and on the t-stat wires. A wireless t-stat would be a no-no. You could consider adding metal to the roof for better propagation, like sheet,fencing or strands of cable.

wa8yxm

Davison Michigan (East of Flint)

Senior Member

Joined: 07/04/2006

View Profile


Offline
Posted: 10/23/21 04:08pm Link  |  Quote  |  Print  |  Notify Moderator

and/or bypass caps on the furnace wires

Chokes on the coax to the HI-Q and on the radio's power lead.


Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times


whizbang

Kenmore, WA

Senior Member

Joined: 08/20/2003

View Profile



Good Sam RV Club Member


Posted: 10/23/21 07:32pm Link  |  Quote  |  Print  |  Notify Moderator

Sounds like I need to invest in a bunch of chokes.

I bought some wire wound ones from DigiKey for the T stat wires. I will get assorted clip on for the rest.

Bypass caps are a good idea too.

Harvard

51.6N 114.7W

Senior Member

Joined: 12/24/2005

View Profile



Posted: 10/23/21 09:53pm Link  |  Quote  |  Print  |  Notify Moderator

Your furnace and transmitter DC negatives are probably daisy chained. Tie the DC negative supply to the chassis and then run separate DC(-) wires individually from there. One wire to the furnace and one wire to the transmitter.

OkieGene

oklahoma city

Senior Member

Joined: 01/06/2004

View Profile



Posted: 10/23/21 10:07pm Link  |  Quote  |  Print  |  Notify Moderator

Go to QRZ.com and to the forums section, the Mobil subsection or others you'll figure out which one, and ask your question there.

Skibane

San Antonio, TX

Senior Member

Joined: 11/09/2005

View Profile


Offline
Posted: 10/24/21 03:10am Link  |  Quote  |  Print  |  Notify Moderator

Don't overlook the wall-mounted thermostat wires. You might try temporarily disconnecting them from the furnace to see if the problem goes away.

Chokes work OK sometimes, but ordinary bypass capacitors (0.1 uF) can also be effective. They're also much cheaper ( which means that you can install a lot more of them), and will fit in much tighter spaces, too.

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 

Open Roads Forum  >  Tech Issues

 > RF getting into Winnebago Furnace!!
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2021 CWI, Inc. © 2021 Good Sam Enterprises, LLC. All Rights Reserved.