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

[Will M0GYZ]

Hi All

Found the problem
Its a grounding issue with the linear since it would TX right either
I go to key up and it just would kick out any power.
I Think this is due to it not being on a flat server sat on a windowsill
and it causing grounding issues.

Thanks
Will M0GYZ





On 22/02/2010 18:25, Will Rittman wrote:
> 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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