VAL Digest V2 #75

VAL Digest         Tuesday, November 23 2004         Volume 02 : Number 075




-----------------------------------------------------------------
When replying to a message, please delete all unnecessary Digest text

To unsubscribe or change to an e-mail format, please go to
http://www.tompatterson.com/VAC/VAList/listoffice.html

Topics in Today's Digest:

Re: [VAL] Toilet gasket.
Re: [VAL] toilet gasket
[VAL] Hum
Re: [VAL] Hum
Re: [VAL] Hum
Re: [VAL] Hum
Re: [VAL] Hum

----------------------------------------------------------------------

Date: Mon, 22 Nov 2004 08:35:52 -0600
From: "Chaplain Kent" <Chaplainkent@xxxxxxxxxx.rr.com>
Subject: Re: [VAL] Toilet gasket.

Ed, with your credentials who can argue with you but can you explain what that
had to do with toilet gaskets?
Chaplain Kent

------------------------------

Date: Mon, 22 Nov 2004 10:30:28 -0600
From: "Dr. Gerald Johnson" <geraldj@xxxxxxxxxx.com>
Subject: Re: [VAL] toilet gasket

In the 2001 RV catalog here by the computer I see three gaskets in the 
same column. One foam rubber, two wax. The wax come with and 
without a center polyethylene sleeve.

The rubber is listed as CP Products, 9/16" thick foam rubber. CP #02125. In 
this Byerely RV catalog its their catalog number 20676 and they ask $2.99. 
800-876-2627 From catalog edition #0157. Whether they actually have it, I 
don't know and they are 400 miles from here so I can't handily drop in and 
check. They also have other gaskets for specific toilets that may not 
connect to the standard closet flange.

I have no interest in the place, just picked up a catalog three years ago, 
it find useful things in it at times.

Gerald J.

- -- 
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.

------------------------------

Date: Mon, 22 Nov 2004 13:03:43 -0800 (PST)
From: Duane Middlebrook <middledn@xxxxxxxxxx.com>
Subject: [VAL] Hum

Hello All!

 

I recently bought a 1976 Argosy 24 footer that Im quite pleased with because 
everything works.  Well, almost.  Im a music lover with sensitive ears.  The 
radio has a pronounced (60 cycle?) hum when running off the Univolt.  If the 
radio is the only thing on, the hum is almost imperceptible, but as the Univolt 
takes on more load (lights, electric cooler, etc) the hum grows louder with 
each additional device that is switched on.  Its not broken, just annoying.  
Does anyone have a fix for this? Maybe some type of filtration?  The radio is 
not the original 8-track.

 

Thanks,

Duane Middlebrook

76 Argosy 24


		
- ---------------------------------
Do you Yahoo!?
 Meet the all-new My Yahoo!  Try it today! 

------------------------------

Date: Mon, 22 Nov 2004 13:16:15 -0800 (PST)
From: Uwe Salwender <salwender@xxxxxxxxxx.net>
Subject: Re: [VAL] Hum

- --- Duane Middlebrook <middledn@xxxxxxxxxx.com> wrote:

> Hello All!
> 
>  
> 
> I recently bought a 1976 Argosy 24 footer that Im
> quite pleased with because everything works.  Well,
> almost.  Im a music lover with sensitive ears.  The
> radio has a pronounced (60 cycle?) hum when running
> off the Univolt.  If the radio is the only thing on,
> the hum is almost imperceptible, but as the Univolt
> takes on more load (lights, electric cooler, etc)
> the hum grows louder with each additional device
> that is switched on.  Its not broken, just
> annoying.  Does anyone have a fix for this? Maybe
> some type of filtration?  The radio is not the
> original 8-track.
> 
>  
> 
> Thanks,
> 
> Duane Middlebrook
> 
> 76 Argosy 24


Duane,
Make sure that the Radio's chassis is grounded. Make
sure teh Antenna is grounded securely. Aluminum has a
tendency to corrode, and if the radio's metal chassis
is not grounded properly, it will seek it's negative
potential through the antenna shield, which will
decrease the shield's function.
Another possible problem might be a defective or about
to be defective Univolt. 
It's supposed to deliver 12VDC, which shouldnot be
humming! There might be an A/C content in the voltage.
Also, make sure the Univolt itself is grounded
properly. 
Best wishes!
Uwe Salwender
Orange, CA

------------------------------

Date: Mon, 22 Nov 2004 15:57:19 -0600
From: "Dr. Gerald Johnson" <geraldj@xxxxxxxxxx.com>
Subject: Re: [VAL] Hum

Most battery chargers add some AC ripple depending on the battery to 
clean it up enough for most uses. Radios are most sensitive to that ripple. 
The classic Univolt also has an acoustical hum that annoys many, 
especially when its under their bed at night.

Both hums should be 120 Hz. One from ripple, the other from 
magnetistriction of the Univolt transformer's core.

It may be possible to filter the power to the receiver. I'd suggest a series 
diode, good for at least 10 amps, then a monster filter capacitor of the 
type sold in car ear blaster audio shops. The anode of the diode 
connects to the raw 12 volt supply, the cathode of the diode connects 
to the positive on the monster capacitor, then to the + power to the 
radio. The negative of the capacitor returns to the supply -. Can probably 
be the smallest available "monster" capacitor.

Otherwise check to be sure the Univolt isn't failing by over charging the 
battery (its common failure mode). Then its time to look at a more modern 
battery charger and monitor that lacks the ripple and treats the battery 
nicely. Look for the water level in the battery going down. A sure sign of 
overcharge.

60 or 120 Hz is C half flat. Modern music only!

Gerald J.

- -- 
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.

------------------------------

Date: Mon, 22 Nov 2004 19:19:15 -0500
From: "Tom" <thomm@xxxxxxxxxx.rr.com>
Subject: Re: [VAL] Hum

You need a filter on the radio.

Tom

- ----- Original Message ----- 
From: "Duane Middlebrook" <middledn@xxxxxxxxxx.com>
To: "VAL" <valist@xxxxxxxxxx.com>
Sent: Monday, November 22, 2004 4:03 PM
Subject: [VAL] Hum


> Hello All!
>
>
>
> I recently bought a 1976 Argosy 24 footer that Im quite pleased with 
> because everything works.  Well, almost.  Im a music lover with sensitive 
> ears.  The radio has a pronounced (60 cycle?) hum when running off the 
> Univolt.  If the radio is the only thing on, the hum is almost 
> imperceptible, but as the Univolt takes on more load (lights, electric 
> cooler, etc) the hum grows louder with each additional device that is 
> switched on.  Its not broken, just annoying.  Does anyone have a fix for 
> this? Maybe some type of filtration?  The radio is not the original 
> 8-track.
>
>
>
> Thanks,
>
> Duane Middlebrook
>
> 76 Argosy 24
>
>
>
> ---------------------------------
> Do you Yahoo!?
> Meet the all-new My Yahoo!  Try it today!
>
> -----------------------------------------------------------------
> When replying to a message. please delete all unnecessary original text
>
> To unsubscribe or change to a digest format, please go to
> http://www.tompatterson.com/VAC/VAList/listoffice.html

------------------------------

Date: Mon, 22 Nov 2004 20:01:38 -0500
From: "Tom" <thomm@xxxxxxxxxx.rr.com>
Subject: Re: [VAL] Hum

What about installing a set of noise canceling headphones to your head? :)

Tom

- ----- Original Message ----- 
From: "Dr. Gerald Johnson" <geraldj@xxxxxxxxxx.com>
To: <valist@xxxxxxxxxx.com>
Sent: Monday, November 22, 2004 4:57 PM
Subject: Re: [VAL] Hum


> Most battery chargers add some AC ripple depending on the battery to
> clean it up enough for most uses. Radios are most sensitive to that 
> ripple.
> The classic Univolt also has an acoustical hum that annoys many,
> especially when its under their bed at night.
>
> Both hums should be 120 Hz. One from ripple, the other from
> magnetistriction of the Univolt transformer's core.
>
> It may be possible to filter the power to the receiver. I'd suggest a 
> series
> diode, good for at least 10 amps, then a monster filter capacitor of the
> type sold in car ear blaster audio shops. The anode of the diode
> connects to the raw 12 volt supply, the cathode of the diode connects
> to the positive on the monster capacitor, then to the + power to the
> radio. The negative of the capacitor returns to the supply -. Can probably
> be the smallest available "monster" capacitor.
>
> Otherwise check to be sure the Univolt isn't failing by over charging the
> battery (its common failure mode). Then its time to look at a more modern
> battery charger and monitor that lacks the ripple and treats the battery
> nicely. Look for the water level in the battery going down. A sure sign of
> overcharge.
>
> 60 or 120 Hz is C half flat. Modern music only!
>
> Gerald J.
>
> -- 
> Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
> Reproduction by permission only.
>
> -----------------------------------------------------------------
> When replying to a message. please delete all unnecessary original text
>
> To unsubscribe or change to a digest format, please go to
> http://www.tompatterson.com/VAC/VAList/listoffice.html

------------------------------

End of VAL Digest V2 #75
************************


-----------------------------------------------------------------
When replying to a message, please delete all unnecessary Digest text

To unsubscribe or change to an e-mail format, please go to
http://www.tompatterson.com/VAC/VAList/listoffice.html