[UK-CONTEST] Dressler D 200 s VHF Linear Amp

[Will Rittman]

Hi All

Thanks for all the help.
It's working brilliantly
I have turn the attenuator down and I'm driving it with just 5 watts to 
give 120w out on.
sitting on a nice 0.2a on the right hand meter

However got a weird problem with the laptop and the amp giving it 
interference on the sound
whenever i plug the laptop in the mains anywhere in the house it picks 
up noise coming out the speakers
whenever the amp is plugged in to.

I've only got this on loan for the Contest season.

Chris 2E0CBS and I go out on the Derbyshire Dales on a Tuesday night 
with a 9ele tonna (but not with amp)
The 1st contest we did was 2nd fed and we came 6th out of 153 by running 
a 50w into the 9ele and RG58
So its not bad going

Thanks
Will M0GYZ






On 22/02/2010 14:13, John Wilson wrote:
> Will,
> I've got one of these and never seen more than about 500 W out maximum.
> For good linearity on SSB I wouldn't push it above about 350 W.  Don't
> take any notice of the power output meter, it's grossly optimistic.  The
> amp is very sensitive and I get full power with about 2 Watts on the
> input and the attenuator switched out.  With a higher power rig start
> off with it set to its lowest possible output power and have the
> amplifier input attenuator set to maximum and work up from there.
>
> John G3UUT
>
> Pascal Grandjean - F5LEN wrote:
>    
>> Hi Will,
>> I know at least 3 models of D200S... and have two here still
>> working well.
>>
>> You can use the attenuator on the back side of the amp.
>> (It's a single variable capacitor).
>> Or if you can choose the output power of the transceiver,
>> D200 work well with few watts input.
>>
>> I'm not sure that reaching 1KW output with a D200 is a good idea
>> for stations in your neighborhood... ;-)
>>
>> 73's Pascal - F5LEN
>>
>>
>>      
>>> -----Original Message-----
>>> From:uk-contest-bounces at contesting.com
>>> [mailto:uk-contest-bounces at contesting.com] On Behalf Of Will Rittman
>>> Sent: 21 February 2010 00:29
>>> To:uk-contest at contesting.com;vhfcontesting at contesting.com
>>> Subject: [UK-CONTEST] Dressler D 200 s VHF Linear Amp
>>>
>>> Hi All
>>>
>>> I have just got a Dressler D200S VHF Amp for contesting and general chat
>>> on 2
>>> However I'm wondering if I can underdrive it or turn it down somehow to
>>> give out 150W
>>>
>>> There is a attenuator pot on the back as well as a high/low switch to
>>> turn the attenuator on.
>>>
>>> The input power for full power is 10-12w drive for anything from 400 to
>>> 1KW out on SSB
>>>
>>> Thanks
>>> Will M0GYZ
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