[Lowfer] " XR's " first WSPR weekend

[Andy - KU4XR]

I haven't tried that yet, but will tonite If nothing gets in the way.
 
Andy - KU4XR - EM75xr - Friendsville, TN. USA




--- On Mon, 12/6/10, John Andrews <w1tag at charter.net> wrote:

> From: John Andrews <w1tag at charter.net>
> Subject: Re: [Lowfer] " XR's " first WSPR weekend
> To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands" <lowfer at mailman.qth.net>
> Date: Monday, December 6, 2010, 4:35 PM
> Andy,
> 
> OK. If you terminate the input to the amp (left side of the
> 180 Ohm 
> resistor) with 50 Ohms (maybe like two 100 Ohm 2 watt
> resistors in 
> parallel), and then connect the transceiver, what happens
> with the 
> antenna current as you bring up the transceiver output?
> 
> John A.
> 
> On 12/6/2010 4:10 PM, Andy - KU4XR wrote:
> > John:  Link to the PA schematic:
> >
> > http://ku4xr.webs.com/apps/photos/photo?photoid=108936955
> >
> > I'm sorry, when I try to explain what I'm doing, it's
> all too
> > easy to get mW, and mA interchanged in my typing.
> >
> > As it should be, the reference is to MilliAmps of RF
> Current,
> > and not MilliWatts...slip up on my part;
> >
> >
> >
> >
> > Andy - KU4XR - EM75xr - Friendsville, TN. USA
> >
> > LOWfer Beacon " XR "
> >
> > --- On Mon, 12/6/10, John Andrews<w1tag at charter.net> 
> wrote:
> >
> >> From: John Andrews<w1tag at charter.net>
> >> Subject: Re: [Lowfer] " XR's " first WSPR weekend
> >> To: "Discussion of the Lowfer (US,
> European,&  UK) and MedFer bands"<lowfer at mailman.qth.net>
> >> Date: Monday, December 6, 2010, 4:02 PM
> >> Andy,
> >>
> >>> *** How ever accurate the power test may be;
> the meter
> >> shows
> >>> 1-1/2 watts output into the 50 Ohm dummy load
> MAX, and
> >> distorted,
> >>> using a 1500 cycle tone. For a clean output,
> it shows
> >> .75 watts .
> >>
> >> That's 17 volts peak to peak across 50 Ohms.
> That's more
> >> than enough to
> >> drive any 1 watt Class D. PA. Did you have a 50
> Ohm
> >> termination at the
> >> input of the PA? Is there a schematic of the PA
> available?
> >>
> >>> I can connect the radio directly to the 50 Ohm
> LPF,
> >> and see
> >>> 60 mW of RF current on the RF ammeter running
> wide
> >> open........
> >>> I connected the radio output thru a .33µF cap
> to the
> >> input of the
> >>> Class " D " amp, and got 90 mW of RF thru
> it..
> >> Disappointment !!
> >>
> >> Are you doing a calculation to get those mW
> readings from
> >> the antenna
> >> ammeter, or are you talking about the antenna
> current in
> >> mA?
> >>
> >> John, W1TAG
> >>
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