[Lowfer] Class D high Vdd level

jrusgrove at comcast.net jrusgrove at comcast.net
Wed Apr 23 09:24:44 EDT 2014 

Pat

Adding turn(s) to the 50 ohm side of output transformer will decrease drain voltage / increase drain 
current ... for the same output power.

Jay W1VD  WD2XNS  WE2XGR/2


----- Original Message ----- 
From: "pbunn" <pbunn at matrixei.com>
To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands" <lowfer at mailman.qth.net>
Sent: Wednesday, April 23, 2014 8:35 AM
Subject: Re: [Lowfer] [EXTERNAL]Re: WG2XSV running wspr-15 tonight on 630m


> Lawrence,
>
> I can push it to 1000 watts but the voltage is over 60 and the FETs don't like it. I am using the 
> 79 material. It doesn't even get warm. I'll keep it at 900. I have another one with two FETs that 
> does over 500 watts with 55 volts - so I am not sure what is happening. I was just wondering. 
> Thanks for the data. Hope to work you sometime. I have been real busy and not too active in the 
> last month.
>
> Pat
> WG2XCT
>
> -----Original Message-----
> From: Lowfer [mailto:lowfer-bounces at mailman.qth.net] On Behalf Of Laurence KL7 L
> Sent: Tuesday, April 22, 2014 5:41 PM
> To: lowfer at mailman.qth.net
> Subject: Re: [Lowfer] [EXTERNAL]Re: WG2XSV running wspr-15 tonight on 630m
>
> Sorry 52V
>
>> From: L.Howell at conocophillips.com
>> To: lowfer at mailman.qth.net
>> Date: Tue, 22 Apr 2014 13:28:41 -0800
>> Subject: Re: [Lowfer] [EXTERNAL]Re:  WG2XSV running wspr-15 tonight on
>> 630m
>>
>> pat - around 500 with the two devices but im a little power starved -
>> ill check again with the scope using the 79 material... :-)
>>
>> > On Apr 22, 2014, at 8:39 AM, "pbunn" <pbunn at matrixei.com> wrote:
>> >
>> > Laurence,
>> >
>> > How much voltage are you running on yours? I max out at about 900 watts at 55 volts DC.
>> >
>> > Pat
>> > WG2XCT
>> >
>> > -----Original Message-----
>> > From: Lowfer [mailto:lowfer-bounces at mailman.qth.net] On Behalf Of
>> > Laurence KL7 L
>> > Sent: Tuesday, April 22, 2014 11:54 AM
>> > To: lowfer at mailman.qth.net
>> > Subject: Re: [Lowfer] WG2XSV running wspr-15 tonight on 630m
>> >
>> > thanks Neil - no decodes from anyone on any mode last nite on 600m,
>> > but again JA1CGM on 137.7784 (with a little long term wobble) was
>> > good on QRSS60  or a little faster from 1035-12Z
>> >
>> > Yes Ive had the the W1VD for a number of years but just changing out the core material to 79 to 
>> > reduce a little heat at full whack key down..
>> >
>> > Cheers
>> > Laurence KL7L
>> > Sunny morning  - lake ice looks like its thawing...a bit.
>> >
>> >
>> >
>> >> Date: Tue, 22 Apr 2014 09:32:07 -0600
>> >> From: lowfer.nklagge at gmail.com
>> >> To: lowfer at mailman.qth.net
>> >> Subject: Re: [Lowfer] WG2XSV running wspr-15 tonight on 630m
>> >>
>> >> Laurence, thank you for looking.
>> >>
>> >> That 500w w1vd amp will surely help ur sigs.
>> >>
>> >> I got decodes from xjm and ac0zl last night as well as a screen
>> >> shot from Garry, SIW who could not decode me because of a 10 hz
>> >> drift on my
>> >> wspr15 signal during the 15 minute segments. I gotta tame that drift !!
>> >>
>> >> Tnx es 73,
>> >> Neil
>> >>
>> >> w0yse, Layton Utah
>> >>
>> >>
>> >> On Mon, Apr 21, 2014 at 10:18 PM, Laurence KL7 L <
>> >> hellozerohellozero at hotmail.com> wrote:
>> >>
>> >>> Also looking your way Neil 600m WSPR2 and 15 and 137 rest of the
>> >>> world window. Don't expect much as bright Aurora last night and
>> >>> continue to lose night without light;
>> >>>
>> >>> Just doing a wiring mod to my W1VD 500m PA and hope to have a
>> >>> little more ERP soon on 600
>> >>>
>> >>> Laurence KL7 L
>> >>>
>> >>>
>> >>>
>> >>>> From: wa3tts at verizon.net
>> >>>> To: lowfer at mailman.qth.net; w0yse.7 at gmail.com
>> >>>> Date: Mon, 21 Apr 2014 22:43:16 -0400
>> >>>> Subject: Re: [Lowfer] WG2XSV running wspr-15 tonight on 630m
>> >>>>
>> >>>> Neil: I'm setup on 600M WSPR 15 rx here, I'll let it run
>> >>>> overnight on my
>> >>> SW
>> >>>> EWE transformer unterminated, which gives a better general west -
>> >>>> omni pattern....
>> >>>>
>> >>>> 73,  Mike wa3tts
>> >>>>
>> >>>>
>> >>>> ----- Original Message -----
>> >>>> From: "Neil Klagge" <w0yse.7 at gmail.com>
>> >>>> To: <600mrg at w7ekb.com>
>> >>>> Cc: "lowfer group" <lowfer at mailman.qth.net>
>> >>>> Sent: Monday, April 21, 2014 6:47 PM
>> >>>> Subject: [Lowfer] WG2XSV running wspr-15 tonight on 630m
>> >>>>
>> >>>>
>> >>>>> ERP ~500+ mW on 475.810 unless that is too close to another '15
>> >>> station.
>> >>>>>
>> >>>>> 73, Neil
>> >>>>>
>> >>>>> *"I use the original form of social networking: Amateur Radio."
>> >>>>> * *(my ham radio sites are at 'w0yse.webs.com <http://w0yse.webs.com>'
>> >>> and
>> >>>>> 'wg2xsv.webs.com <http://wg2xsv.webs.com>' )*
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