Hi Tom.
If you can listen to yourself on a receiver without an antenna (so you
don't overload the frontend), put the receiver in AM mode and tune in your
carrier. See if you can hear either 60 Hz or 120 Hz modulation on the
carrier. If you can't, I probably wouldn't worry much about it. If you
can, then you might want to look for a different supply.
73, de Lou K2LKK
At 10:56 PM 12/26/2007 -0500, you wrote:
> John:
>
>The fan in the radio does come on every so often, after I've transmitted for
>a while, but the hum I'm hearing is definitely coming from the power supply.
>It occurs whenever I transmit in CW on 100 watts. It actually corresponds
>with the dits and dahs that I send. If I then go to RTTY mode, and use the
>PTT on the stock mic, the hum is continuous. It starts when I key the
>transmitter, and ends whenever I unkey.
>
>And, it sounds very much like the kind of 60-cycle hum that you can hear if
>you listen very closely to a transformer-type power supply like my RS35.
>
>Again, in the Samlex, it happens when I key up, and ends when I unkey.
>
>73 from Tom Behler: KB8TYJ
>
>----- Original Message -----
>From: "John Miller" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Wednesday, December 26, 2007 9:46 PM
>Subject: Re: using TS480 with 35-amp Samlex switching power supply
>
>
> > I've never run CW on my 706, but I've run everything else at about full
> > power and even a second radio some times, VHF, for some events, pulling a
> > pretty good 21 to 23 amps from that power supply and never heard a thing.
> > That's not to say my fan doesn't work though, that's possible. I also
> > wonder
> > if that could be the fan in the radio you're hearing? It could be that
> > your
> > fan does come on then, mine has never once come on so I have no clue when
> > it
> > comes on or what it sounds like. I can't get that power supply warm for
> > anything.
> > ----- Original Message -----
> > From: "T Behler" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Wednesday, December 26, 2007 9:41 PM
> > Subject: Re: using TS480 with 35-amp Samlex switching power supply
> >
> >
> >> John:
> >>
> >> Do you get any of the hum I'm speaking of when in CW mode on 100 watts?
> >>
> >> 73 de KB8TYJ
> >>
> >> ----- Original Message -----
> >> From: "John Miller" <[log in to unmask]>
> >> To: <[log in to unmask]>
> >> Sent: Wednesday, December 26, 2007 9:08 PM
> >> Subject: Re: using TS480 with 35-amp Samlex switching power supply
> >>
> >>
> >>> My samlex power supply fan takes a lot to come on, that or it doesn't
> >>> work.
> >>> ----- Original Message -----
> >>> From: "Colin McDonald" <[log in to unmask]>
> >>> To: <[log in to unmask]>
> >>> Sent: Wednesday, December 26, 2007 9:02 PM
> >>> Subject: Re: using TS480 with 35-amp Samlex switching power supply
> >>>
> >>>
> >>>> probably the fan.
> >>>> that's about all that can make any noise inside a switching power
> >>>> supply.
> >>>> The bigger supplies will have a fan that comes on automatically when
> >>>> allot
> >>>> of current is being drawn.
> >>>> 73
> >>>> Colin, V A6BKX
> >>>> ----- Original Message -----
> >>>> From: "T Behler" <[log in to unmask]>
> >>>> To: <[log in to unmask]>
> >>>> Sent: Wednesday, December 26, 2007 6:48 PM
> >>>> Subject: using TS480 with 35-amp Samlex switching power supply
> >>>>
> >>>>
> >>>>> Hi, all.
> >>>>>
> >>>>> I have noticed something when using my TS480 with my 35-amp Samlex
> >>>> switching
> >>>>> power supply.
> >>>>>
> >>>>> When I transmit with 100 watts, in CW mode or in RTTY mode using the
> >>>>> stock
> >>>>> mic, I notice a slight but audible hum coming from the switching power
> >>>>> supply. The hum stops when I stop transmitting. I had my XYL take a
> >>>>> look
> >>>>> at the meters on the front of the supply, and they say I'm running at
> >>>>> 13.8
> >>>>> volts, and drawing about 19 amps, which is about what I'd expect.
> >>>>>
> >>>>> And, just for the record, I'm doing this with a resonant antenna, and
> >>>>> just
> >>>>> using the auto-tuner to be sure I have a perfect match.
> >>>>>
> >>>>> Is this slight but noticeable hum when transmitting normal?
> >>>>>
> >>>>> Thanks, and 73 from Tom Behler: KB8TYJ
> >>>>>
> >>>>>
> >>>>>
> >>>>> --
> >>>>> No virus found in this incoming message.
> >>>>> Checked by AVG Free Edition.
> >>>>> Version: 7.5.516 / Virus Database: 269.17.9/1197 - Release Date:
> >>>> 12/25/2007 8:04 PM
> >>>>>
> >>>>>
> >>>>
> >>>
> >>>
> >>
> >
> >
>
>
>
>
>--
>No virus found in this incoming message.
>Checked by AVG Free Edition.
>Version: 7.5.516 / Virus Database: 269.17.11/1200 - Release Date:
>12/27/2007 1:34 PM
Louis Kim Kline
A.R.S. K2LKK
Home e-mail: [log in to unmask]
Work e-mail: [log in to unmask]
Work Telephone: (585) 697-5740
|
