[Heathkit] HW 16 output

[sbjohnston at aol.com]

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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