Low power on 10 and 15

[Stu Lyon]

Greg,
That's normal. I have just finished rebuilding three SB-401s which have
essentially the same circuitry and that's the same power they indicated on a
home-brew power meter. One thing I did notice is that the power meter itself
is frequency sensitive. Its indication drops off on the higher bands.

As a cross check, use the relative power meter on the HW-101 front panel
which should be frequency insensitive. Assuming you have a pure resistor
dummy load and you adjust the relative power to indicate a .7 on the meter
at 100 watts on the power meter, then 75 watts should indicate .6 on
the -101 meter. If the meter indicates higher, then the power meter is
frequency sensitive and not giving you a true reading.
The math:
E = sqrt(P x R)
sqrt(100 x 50) = 70.7V
sqrt( 75 x 50) = 61.2 V

73, Stu W6CUX
Winnetka, CA

----- Original Message -----
From: "Greg Hockenjos" <nunu726 at lycos.com>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Saturday, February 10, 2001 4:00 PM
Subject: Low power on 10 and 15


> Hello. I just rebuilt my power supply, a HP-23. New caps and diodes. I
have a HW-101. I get 100 watts on 80, 40 and 20 meters. On 15 and 10 only 75
watts. I have changed the finals and driver and have re adjusted all the
coils and nothing helps. The radio transmits and receives great, but will
not put out full power on 10 and 15 meters. Any ideas? Greg.
>

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