Will,
Paul has used a toroidal transformer, completely shielded. The directional
couples is well engineered.
I will make some pictures of the internals of the DL5K an post them on the
emtron yahoo group.
http://groups.yahoo.com/group/emtrondx15/
Also the resistor in the RF sampling and rectifier circuit was too small and
burned out, I still have to
replace it with one Rich his 3 watt MOF resistors from which I keep a small
stock for cases like this.
Other than this the DL5K is very capable and it dissipates short 5 kW
carriers very easy. The unit was tested @ 1kW carrier, 3 minutes on and 3
minutes off last winter and it turned out to be a nice shack-heater.
Actually I was not able to purchase and import the big two 100 ohm tubular
carbon resistors for a lower price than Paul delivered me the DL5K.
Cheers, Dick
PA3DUV
----- Original Message -----
From: "Will Matney" <craxd1@verizon.net>
To: <amps@contesting.com>
Sent: Saturday, June 17, 2006 5:39 AM
Subject: Re: [Amps] New Dummy Load
> Dick,
>
> Does Palstar use a stripline or a small toroidal transformer to sample the
> RF for the wattmeter? If toroidal, does it have a Faraday shield? I'm
> wondering why it's not wide banded enough.
>
> Best,
>
> Will
>
> *********** REPLY SEPARATOR ***********
>
> On 6/16/06 at 11:05 PM PA3DUV wrote:
>
>>I have used the Palstar DL5K with 5 kW input and found the dummyload a
>>good
>>performer.
>>However, the directional coupler and the power measurement electronics are
>>not frequency compensated.
>>With a rather proper reading on 14 MHz the power measurement was way out
>>on
>>3.6 and 28 MHz.
>>For that application the Array Solutions PowerMaster with 10 kW coupler
>>might be a better tool.
>>
>>I found the PowerMaster with 10 kW coupler very accurate at power levels
>>around 6 kW, using my big Rohde&Schwarz 10 kW dummyload to dissipate the
>>RF
>>energy (Thanx Hans!). To check the PowerMaster readings I used my gud old
>>100 MHz Tec 465 scope and the attenuated output on the R&S 10/50.
>>
>>Cheers, Dick
>>PA3DUV
>>
>>
>>----- Original Message -----
>>From: "Harold Mandel" <ka1xo@juno.com>
>>To: "'zdtech'" <zdtech@iprimus.com.au>; <amps@contesting.com>
>>Sent: Friday, June 16, 2006 2:55 PM
>>Subject: Re: [Amps] New Dummy Load
>>
>>
>>> The product spec sheet says "6KW Burst."
>>> The bargraph on the front panel has a 2.5KW maximum.
>>>
>>> $2K?
>>>
>>> Palstar's big dummy load is calibrated to 5KW.
>>>
>>> Hal
>>> W4HBM
>>>
>>> -----Original Message-----
>>> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
>>> On
>>> Behalf Of zdtech
>>> Sent: Friday, June 16, 2006 7:29 AM
>>> To: amps@contesting.com
>>> Subject: [Amps] New Dummy Load
>>>
>>> Just noticed this on Alpha's web page for those interested.
>>>
>>> http://www.alpharadioproducts.com/2100.asp
>>>
>>> Craig
>>> VK3HE
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>>>
>>>
>>>
>>> _______________________________________________
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>>> http://lists.contesting.com/mailman/listinfo/amps
>>
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>
>
>
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