Roger
1)See Item #3 in original post !!
2) 3KV under load ???
3) What are you using to measure power out ?
4)What did you use the to measure the plate voltage? The meter on SB220
or some other source?
Dave
NR1DX
On 6/6/2020 1:28 AM, Roger - W7TZ wrote:
My recently purchased conversion has a tuned input where the band
selector was. 3kv plates, 50w input gets me ~1kw out.
73, Roger
W7TZ
CN83ia
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On Fri, Jun 5, 2020 at 8:47 PM Artek Manuals <Manuals@artekmanuals.com
<mailto:Manuals@artekmanuals.com>> wrote:
Agree in principle..QSK on 6M not that important
Dave
NR1DX
On 6/5/2020 11:30 PM, Jim wrote:
> Good article except for tearing out the original relay. Not
necessary,
> unless you want to use QSK or hate the sound of loud relays
(like I do).
>
>
> Thanks
> 73
> Jim W7RY
>
> On 6/5/2020 10:24 PM, Adrian wrote:
>> Have you seen this one Steve ?� ;
>>
>> http://www.arrl.org/files/file/Technology/QST_Apr_2008_p38-40.pdf
>>
>>
>> On 6/6/20 1:10 pm, Artek Manuals wrote:
>>> I have enough HF amps here (four at last count) One of them is an
>>> ancient SB-220 , so I thought what the heck I would "hack" it and
>>> turn it into a 6M single band. I have a folder� full of
articles on
>>> how to from the last 20 + years.
>>>
>>> All done "physically" but try as I may I can not get more than
about
>>> 600w out .
>>>
>>> 1) Two different tank circuits , one with a section of the
original
>>> 10/15� coil from the SB220 and a 2nd one with a a piece of flat
>>> copper strap ...no difference
>>> 2) Changed the parasitic chokes
>>> 3) Tried� "T" input match. Pi input match , straight through
...no
>>> difference
>>> 4) Plate voltage is 2400 unloaded and about 2050 loaded in CW
position
>>> 5) Bias measures 6V
>>> 7) Has new Hardbach bias and diode and metering board
>>> 8) Older set of Eimac 3-500Z and newer set RF Parts 3-300ZG ...no
>>> difference
>>>
>>>
>>> What am I missing, ?
>>> What else to try?
>>>
>>> Dave
>>> NR1DX
>>> manuals@artekmanuals.com <mailto:manuals@artekmanuals.com>
>>>
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www.ArtekManuals.com <http://www.ArtekManuals.com>
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