[Heathkit] HW 16 output

Sun Aug 31 19:52:28 EDT 2008

Measured he B+ in the HW16 and found it to be 550volts. Somewhat low I would 
think. Measured value of one of the voltage doubler caps was on the mark but 
it's leakage was very high (Sencore Z53 cap meter/analyzer). Just ordered a 
complete electrolytic set from "Hayseed". Will work on the OLSON SIX while 
waiting parts. Thanks guys for all the info and help.  Mike G w6we
----- Original Message ----- 
From: <sbjohnston at aol.com>
To: <Heathkit at mailman.qth.net>
Cc: <w6we at bak.rr.com>
Sent: Sunday, August 31, 2008 10:03 AM
Subject: Re: [Heathkit] HW 16 output

Also check the values of resistors - Heathkits are notorious for having
resistors that change value as the years go by.  For example, you might
have a resistor in the screen circuit of the oscillator or driver that
has gone higher in value, in effect turning the power down.

The schematic diagram has excellent voltage readings marked on it, both
the idle (not transmitting) and key-down (transmitting) conditions.

I'll send you a copy of the schematic, zoomed-in on the transmitter to
make it easier to concentrate on the power output issue.

Steve WD8DAS

sbjohnston at aol.com
http://www.wd8das.net/
---------------------------------------------------
Radio is your best entertainment value.
---------------------------------------------------

-----Original Message-----
From: Michael Waldrop <w5rkl at yahoo.com>
To: Tom NØJMY - AAR7FV <tfarl at mchsi.com>; Mike Goshay <w6we at bak.rr.com>
Cc: Heathkit at mailman.qth.net
Sent: Sat, 30 Aug 2008 9:08 pm
Subject: Re: [Heathkit] HW 16 output

Hello Mike and Tom,

The HW-16 is rated between 50 to 90 watts "input" (adjustable).

Measure the final plate voltage and the final plate current at
resonance
(maximum output). Multiply the plate voltage by the plate current will
give you
the actual DC input power in the final amplifier. Subtract a minimum of
50% from
the input power should give you the average DC output power in CW. I
recommend
using a 50 ohm du
mmy load when making these checks.

The schematic shows the final's plate voltage is 700VDC. In order to
achieve 90
watts input, the final tube's plate current at maximum output would be
130ma.
Using ohm law, multiple the plate voltage by plate current (700 x .130
= 91
watts) input in the final. Subtract a minimum of 50% efficiency in the
final
should produce a maximum output of 45 watts.  Of course that's if the
power
supply is capable of producing full output voltage and current at
maximum RF
output, the tubes are good, and the HW-16 is aligned properly.

I agree with Mike, more than likely someone has mess with the entire
alignment
which will affect both the transmitter and receiver.

73
Mike
W5RKL
.

--- On Sat, 8/30/08, Mike Goshay <w6we at bak.rr.com> wrote:
From: Mike Goshay <w6we at bak.rr.com>
Subject: Re: [Heathkit] HW 16 output
To: "Tom NØJMY - AAR7FV" <tfarl at mchsi.com>
Cc: Heathkit at mailman.qth.net
Date: Saturday, August 30, 2008, 8:03 PM

Thanks for the input. Yes, I have installed 5 output tubes without
meanfull
change in output into Bird 43 and good Dummy load I will next re
install
other 6cl6's; even though current ones test quite good on my Hickock
600a.Will investigate B+ as you suggect. I also have a clip on HP
ampmeter
that reads 1 Amp max So between the two I may find that do NOT have as
much
input as they say.  Oh well; This just supposed to
 be fun anyway.  Mike
G
w6we
----- Original Message -----
From: "Tom NØJMY - AAR7FV" <tfarl at mchsi.com>
To: "Mike Goshay" <w6we at bak.rr.com>;
<Heathkit at mailman.qth.net>
Sent: Saturday, August 30, 2008 5:30 PM
Subject: Re: [Heathkit] HW 16 output

> Well, I've heard various things from various people, Mike.  Into a 50
ohm
> load, my experience has been around 50W out on 80 & 40, around 35-40W
on
> 15.
>
> I would carefully check the power supply voltages per the schematic -
> carefully, as they are lethal - and see if the P/S is putting out
what it
> is supposed to.  It's pretty common for some of the 2 watt resistors
to go
> high and drop the B+ considerably.  And, of course there's the leaky
> can-caps . ;^)
>
> If that doesn't work and you've got another 6GE5 around you might
try
> subbing it.  The 6CL6's, too, if you've got them.
>
> Have you done the transmitter alignment?  Sometimes you'll run into a
'16
> that someone's messed with and got the alignment all balled up.
>
> There's other things that can cause your low output, but I'd look
at those
> first, were it me.
>
> 73 es GL
> Tom
> ---------------------
> HW-16 Panel Overlays and Multi-Section Electrolytic Cans -
> www.hayseedhamfest.com
>
>
> ----- Original Message -----
> From: "Mike Goshay" <w6we at bak.rr.com>
> To: <Heathkit at mailman.qth.net>
> Sent: Saturday, August 30, 2008 7:06 PM
> Subject: [H
eathkit] HW 16 output
>
>
> Will anyone here answer a question on a Heathkit HW16? What is
"supposed"
> to be the OUTPUT?? All my finals show +-30w on 40 meters. Seems  low
to me

> for 90w input ( so they say).  Mike G w6we
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