[Amps] high drive/low output QRO HF-2500
Carl
km1h at jeremy.qozzy.com
Thu Feb 19 20:53:49 EST 2015
Same problem on all bands?
Carl
KM1H
----- Original Message -----
From: "Steve Bookout" <steve at nr4m.com>
To: <TexasRF at aol.com>; <amps at contesting.com>
Sent: Thursday, February 19, 2015 7:40 PM
Subject: Re: [Amps] high drive/low output QRO HF-2500
> The K3 that is driving it shows 1.2 or 1.3 to 1 standing wave.
>
> Steve
>
>
> On 2/20/2015 00:31 , TexasRF at aol.com wrote:
>> 90W drive; how much reflected?
>> 73,
>> K5GW
>> In a message dated 2/19/2015 5:22:23 P.M. Central Standard Time,
>> steve at nr4m.com writes:
>>
>> Hello all,
>>
>> Took a QRO HF-2500 out of storage and put it on my 40 meter mult
>> station.
>>
>> Tuned by the book (because I never can remember how to tune this
>> thing
>> without the book...) and the output is low at about 1050 watts. This
>> is with about 90 watts of drive. When last used it was used on 15
>> only,
>> but always got plenty of power out. Efficiency looks fine at
>> about 62%
>> (700ma @ 2400 volts)
>>
>> As I recall, this amp used to drive full output with 35, or so,
>> watts.
>>
>> Power doesn't drift, and tunes up easy. It's just acting more
>> like an
>> SB-220 than the amp it is.
>>
>> Plate and load cap settings appear correct per the manual.
>>
>> Ideas?
>>
>> 73 de Steve, NR4M
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>
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