Polystyrene sheets, also good for building model railroad accessories.


-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]] On Behalf Of Steve Dresser
Sent: Saturday, December 12, 2015 5:43 PM
To: [log in to unmask]
Subject: Re: Re-thinking New RS35 Power Supply Issue Again

Steve,

This morning, I heard someone mention something he called "foam board," 
which he said was available at Home Depot and was an effective cure for mechanical hum of the type Tom describes.  Apparently, the stuff comes in 4-foot sheets and is about an inch thick.  Of course, another solution for the hum is to hire a rock band and have them play at full volume whenever the supply is turned on, at which point the hum will be a very minor concern.

Steve

----- Original Message -----
From: "Steve Forst" <[log in to unmask]>
To: <[log in to unmask]>
Sent: December 12, 2015 16:38
Subject: Re: Re-thinking New RS35 Power Supply Issue Again


> Tom,
>
> Best cure for odd noises in the shack is a good pair of headphones.
>
> It won't kill you to check  and see if things are tight inside,  unless
> you leave it plugged in while  waving a screwdriver around in there,
> then it just might kill you.
>
>
> Just getting the cover off and back on may  change things, maybe even
> for the better.
>
> I would also follow the earlier suggestion of putting something under
> the feet.   It doesn't have to be a big thing, just little  circles of
> whatever under each foot.    Little half dollar size pieces of carpet
> padding or whatever you can swipe  when your wife isn't looking.
>
>
> Hum seems to be the nature of the beast with the Astron's, and some seem
> to be worse than others.
>
> 73, Steve KW3A
>
>
>
>
>
> On 12/12/2015 4:23 PM, Tom Behler wrote:
>> Steve:
>>
>> I guess I'm a bit puzzled as to why I didn't hear it with my older RS35, 
>> and
>> other supplies I've used.
>>
>> All that aside, I think that tonight, I might take the cover off, and try 
>> to
>> re-tighten all the screws to be sure everything is firmly in place.
>>
>> Then, I'll see if I can make some sort of a wedge out of folded Braille
>> paper or something like that to insulate the top and sides of the cover 
>> from
>> the main unit to cut down a bit on the vibration hum.
>>
>> Thanks for your patience with this, everyone.
>>
>> Tom Behler: KB8TYJ
>>
>>
>> -----Original Message-----
>> From: For blind ham radio operators 
>> [mailto:[log in to unmask]]
>> On Behalf Of Steve Dresser
>> Sent: Saturday, December 12, 2015 3:50 PM
>> To: [log in to unmask]
>> Subject: Re: Re-thinking New RS35 Power Supply Issue Again
>>
>> Tom,
>>
>> The increase in hum is normal.  It happens when you draw more current 
>> from
>> the supply, and it happens with all power supplies.  As long as the 
>> supply
>> is delivering the right voltage under load, you have no real basis for
>> returning it.
>>
>> Steve
>>
>> ----- Original Message -----
>> From: "Tom Behler" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: December 12, 2015 15:01
>> Subject: Re-thinking New RS35 Power Supply Issue Again
>>
>>
>>> Hello, again, everyone.
>>>
>>>
>>>
>>> I am now beginning to wonder if today is my day for Murphy to make a 
>>> visit
>>> here, or just what exactly the deal is.
>>>
>>>
>>>
>>> I was working a bit of the 10-meter contest today, and noticed a further
>>> problem with the hum issue on my new Astron RS35 power supply.
>>>
>>>
>>>
>>> I'm not sure why I didn't notice it last night when I did my testing, 
>>> but
>>> now, I find that whenever I transmit in CW at any power level-i.e. 5 
>>> watts
>>> or 100 watts, the hum on the RS35 slightly increases.  In other words,
>>> when
>>> I key down, I hear a slight, but noticeable increase in the hum at any
>>> power
>>> level.
>>>
>>>
>>>
>>> So, now, I'm trying to decide whether I actually should return the 
>>> supply
>>> to
>>> H R O.
>>>
>>>
>>>
>>> I have my receipt and all other documentation, but I'm wondering whether
>>> the
>>> folks at HRO would see this as a significant enough of a problem for a
>>> product return.
>>>
>>>
>>>
>>> The supply still seems to carry the load ok, and does put out what I 
>>> would
>>> expect in terms of output power readings, but the hum issue is a
>>> noticeable
>>> one now, on several counts.
>>>
>>>
>>>
>>> I don't mean to be obsessive about this, but I wouldn't expect to be
>>> dealing
>>> with this sort of issue with a newly-purchased power supply like this.
>>>
>>>
>>>
>>> I'd continue to be interested in anyone's thoughts.
>>>
>>>
>>>
>>> Tom Behler: KB8TYJ
>>>
>>>
>>