[Amps] Topband: Elimination of Treadmill RFI on 160 meters

[Gary Schweitzer]

Gary,
I would replace the bulbs with LEDs. I've done that in both my AL-811H 
and my tuner with a dropping resister and the new bright white LEDs and 
I"ll probably never have to touch them again.

--

Thanks,

Gary Schweitzer

KF7BS  | KF7BS at comcast.net <mailto:KF7BS at comcast.net>

-- 
On 1/27/15 10:43 PM, Gary Smith wrote:
> I have two Astron power supplies; a VS-35M & a RS-35M. The RS-35M has
> stopped working & I have to track down that issue. While I'm in
> there, are there any known mods I should do to either of these?
> Sounds like I should remove the paint under the lug and attach the
> green wire properly to the chassis.
>
> Anything else that's suggested?
>
> An aside, the lamps in these meters are terrible, both of these
> supplies are fairly new and all four of the  meter lamps are dead and
> absolute buggers to get at. Several calls to the company were met
> with indifference and no replacement lamps.
>
> If there's known mods, I'm always keen on upgrading my station.
>   
> 73,
> Gary
> KA1J
>
>> On Tue,1/27/2015 4:08 PM, Tom W8JI wrote:
>>> The flaw in this system is that differential voltages between current
>>> carrying wires are not measured, and anything on the safety ground
>>> isn't measured.  Noise voltage is only measured from individual
>>> current carrying conductors to ground, and the safety ground is
>>> grounded and not measured.
>> Exactly right, Tom. A common design/manufacturing defect is that the
>> green wire fails to make contact with the shielding enclosure, but
>> instead goes to common on a circuit board, which may or may not ever
>> find the chassis. This defect, which is the power system equivalent of a
>> Pin One Problem, puts noise on the green wire. You may remember that we
>> corresponded several years ago about Astron power supplies, in which a
>> very common defect is that the green wire is soldered to the mounting
>> lug of a terminal strip, which is insulated from the chassis by paint.
>> The same mounting lug is the point where V- is bonded, so it never finds
>> the chassis either. AND, wiring for both V- and the green wire act as
>> antennas for both TX and RX.
>>
>> I have long suspected that similar defects are at least partially
>> responsible for noise conducted onto coax and AC lines from consumer
>> products of all sorts.
>>
>> 73, Jim K9YC
>>
>>
>> _________________
>> Topband Reflector Archives - http://www.contesting.com/_topband
>>
>
>
>
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