Yet another product idea

[Joe Subich, W4TV-4]

 > IMD could be better <http://www.qsl.net/f1jrd/800wR.JPG> at least on
 > 144MHz.

-35 dB doesn't look too bad compared to a lot of the stuff out there
today - even if it is a PEP (ARRL) measurement.  If it is referenced
to one of the two tones, it's significantly better than most of the
currently available transceivers.

 > FWIW, Freescale claims that these devices are candidates for
 > broadcast applications.

It would still be nice to see some manufacturer's specifications
and test data in linear service.  Given the raw gain and the
unmatched design, it should be possible to do an 800 - 900 watt
broadband block without overly stressing them ... two amps would
be an interesting at 1500 W PEP output assuming the IMD did not
increase too much at reduced power output (another reason for
manufacturer's specs/test data).

At $275 each (Q=1) a pair is competitive with an 8877.

73,

    ... Joe, W4TV


On 4/10/2011 5:27 PM, Toby Deinhardt wrote:

>  > Nice for pulsed or CW devices. How about specs for AB1 service
>  > including standing current and IMD? Standing current (bias) is
>
> IMD could be better <http://www.qsl.net/f1jrd/800wR.JPG> at least on
> 144MHz.
>
> Graph taken from <http://www.qsl.net/f1jrd/MRFE6VP61K25H.html>.
>
> FWIW, Freescale claims that these devices are candidates for broadcast
> applications.
> <http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MRFE6VP61K25H>
>
>
> vy 73 de tooby, DD5FZ
>
>

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[Bob Nielsen-2]

One of the USB pins is a ground connection.  I don't know if this carries through the USB-RS232 adapters.

Bob, N7XY


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[Alexander Sack]

On Sun, Apr 10, 2011 at 5:20 PM, Phil Hystad <[hidden email]> wrote:
> I agree.  I have had at least two Mac computers in my shack since I got licensed up again in 2004.  Currently I have a 17 inch Macbook Pro that I am currently typing, an iMac 24 sitting on the desk two feet from the rigs, and just add to that I have an iPad and an iPhone in the room too.  Oh, and a Windows laptop in the closet.  Upstairs is my wife's iMac-27 and her iPhone.  Oh, I forgot, I have an iPhone in the desk too but it is currently off and no SIM card in it.
>

Same here, I am on a slightly older (2008) 17" MBP.  No issues with
ground whatsoever.  Unit literally sits right next to notebook on a
small table.  I would ground if you had a reason, otherwise you are
chasing ghosts.

-aps
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[Eric Champine]

Hey Phil.
I have my iMac not 10 inches away form my rig without a problem.
I don't think the computer needs to be grounded with the exception of the
ground fault connection in the AC cable going to the outlet. When we get bad
weather though, I do disconnect my rig from the antenna and I also
disconnect the "Serial to USB" cable from the rig to my computer just to be
on the safe side. Hope this helps.

73 de W2EEC

Eric
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