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Date: Thu, 31 May 2012 12:46:46 +0200
From: =?windows-1252?Q?Stefan_Sch=E4fer?=
 <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: 475 kc Exiter /JUMA
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Oh yes, indeed. I just take a look to the website. It costs 300 Euro=20
which is not to much. The whole kit looks very high quality and the=20
functions are FB. Also the power ranges. Normally i want to build my own=20
equipment but here i may become weak :-)

Also the PA design looks very interesting to me. They say 14V/5A for=20
60W, i.e. about 85% efficiency. The FETs is use are ordinary TO220=20
devices. Looks all very interesting. I will take the idea of the=20
"current mode class D PA" and play arround with it...
For this power level and frequency, ferrite transformaers can be very=20
small, unusual when coming from 2200m :-)

73, Stefan/DK7FC

Am 30.05.2012 19:45, schrieb Warren Ziegler:
> Uwe,
>
>     The Juma 500 is a FB little transmitter, lots of built-in features
> (synthesizer, keyer, swr bridge, receive preselector, receive
> converter) in a very small package. It is capable of more than 60W
> out, I have run it with 15vdc (which is in-spec) and with a 30 ohm or
> so antenna impedance you can get 100W out all day and all night with
> no complaints.
>
> 73 Warren K2ORS
>
>
> On Sun, May 27, 2012 at 3:39 AM, Uwe Wensauer<uwe.wensauer@gmx.de>  wro=
te:
>   =20
>> What do You think about the JUMA TX500 TransmitterI
>>
>> In my eyes a  small Rig with 60 Watt and built in Converter.
>>
>> By the way, have a look at the filters in use =96 easy to built an dup=
licate
>>
>> Uwe, dk1kq
>>     =20
>
>
>   =20