[NLRS] PA3GIE 10GHz high power SSPA

[Barry Malowanchuk]

I have 50 W on tropo.  Often having 50 W means that the 2 W station will find you, get lined up and then a QSO may be possible...even if its only on a tropo peak.  Unless 2 W stations are lined up they may never find the tropo peaks.  This is especially usefull on rain scatter as long as you dont get too sharp on the antennas ( stay to ~18 inz0

Barry VE4MA

----- Original Message -----
From: "Zack Widup" <w9sz.zack at gmail.com>
To: "NLRS List" <nlrs at mailman.qth.net>
Sent: Saturday, October 20, 2012 9:43:22 AM
Subject: Re: [NLRS] PA3GIE 10GHz high power SSPA



I spoke with Jeffrey Pawlan, WA6KBL, recently. I believe he is the one
presenting the paper at MUD. He said he was too late in getting it
prepared to have it in the proceedings, but I think he will make it
available on the web somewhere.

I can see using this kind of power level for EME but what is really
necessary for terrestrial work? Both stations would most likely have
to have comparable setups to have a QSO if conditions are marginal. I
have a feeling not too many people are going to have power at 10 GHz
at this level.

During a big opening in 2008, I worked K4ZR and W4ZRZ on 10 GHz from
EN50rl. That was close to a 500 mile path. I was running 2.5 watts.
Signals were loud at both ends on all bands through 10 GHz. Openings
like that don't happen often, but you don't need a lot of power if you
do happen to catch such an opening. Otherwise, if one station is
running 50 watts and the other is running 2, I don't think a 2-way QSO
is going to happen.

73, Zack W9SZ


On 10/19/12, Dr. Gerald N. Johnson <geraldj at weather.net> wrote:
>
>
> I read a couple weeks ago that the DB6NT 50 watt amp is $3500.
>
> There are some bare chips from Triquint that will do 90 watts for only
> $240 each in small quantities. Trouble is they need wire bonding after
> soldering to the heat sink with Sn/Au alloy solder. I think there's a
> presentation this weekend at MUD that's not in the printed proceedings.
> Maybe it will be in the CD if there is a CD. Set for 3:30 Saturday:
> "3:30 50W 10GHz SSPA using GaN, WA6KBL" from the presentation schedule.
> I wish I could see that presentation or read it. I have my own ideas
> thinking a Sn/Bi low temperature solder would be far easier to find and
> to use and that rather than multiple ball bonds one might solder down PC
> board traces right close to the bare chip and make the chip connections
> with silver bearing epoxy and thin copper foil. Then cover the assembly
> with a good curing board coating though that might increase the
> dielectric constant and be a poor quality dielectric at the same time.
> Just to project the chip from the atmosphere. There is a 10 watt version
> of the Triquint chip far less expensive that is like 1/8 th of the 90
> watt chip. In fact the S parameters on the high power chip are for the
> 10 watt chip, repeated 8 or 9 times for the 90 watt part.
>
> 73, Jerry, K0CQ
>
> On 10/19/2012 5:52 PM, Doug Reed wrote:
>>
>>
>> <http://www.gie-tv.com/3cm/3cm-pa.html>
>>
>> For those of you who want to jump to the next level of 10GHz RF power,
>> here is a 25 watt amp. Requires 200mw drive for 25W out. I didn't bother
>> looking any deeper because I don't have EU1695 to spend.  :-)
>>
>> 73, Doug Reed, N0NAS.
>> ______________________________________________________________
>>
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