Bob:
I have done this, and it has reduced the hum to some degree.
But, the hum still gets slightly but noticeably louder when I transmit at
any power level.
I don't recall having this problem with other similarly rated power
supplies.
Do you think this is normal; I just wasn't expecting it, I guess.
Tom Behler: KB8TYJ
-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Bob Tinney
Sent: Saturday, December 12, 2015 3:17 PM
To: [log in to unmask]
Subject: Re: Re-thinking New RS35 Power Supply Issue Again
Tom,
As others have said, the hum is probably coming from a vibration in the
steel cover. When I had an Astron RS35, I stuck a folded file card between
the top edge of the front panel and the top cover and that really reduced
the transformer hum that I could hear.
Bob, K8LR, [log in to unmask]
On 12/12/2015 3:01 PM, Tom Behler wrote:
> 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
>
>
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