[TenTec] Herc II idling collector current adjustment

[Horst]

Hallo Christian,

meine Reichelt Bestellung:

3 x BEL 160X100-1 Fotoplatine, einseitig, 160x100mm, 1,5mm, 35µ   1.60
1 x WIHA 369-S9 Wiha-Sechskant-Kugelkopf-Winkel-Set, 9-teilig
14.50
1 x RKT 12012 Ringkerntrafo, 120 VA, 2x 12 V, 2x 5,0 A
17.65     
1 x RKT 16012 Ringkerntrafo, 160 VA, 2x 12 V, 2x 6,66 A
22.55     
1 x NT 108VA 2X12 Netztrafo, offene Bauform, 108VA, 2x 12V   	21.40   


Gruß
Horst

Ich brauche nur einen Trafo, daher werde ich die Trafos wenn Du hier
bist
eben messen und den geeigneten behalten. (Die anderen gehen wieder
zurück)

Da ich 12.6V bei 3 A brauche muss ich die Trafos erst testen.
Ich denke es ist für Dich kein Problem... oder?
-----Ursprüngliche Nachricht-----
Von: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com] Im Auftrag von Phil Chambley, Sr.
Gesendet: Montag, 21. Februar 2005 23:17
An: Discussion of Ten-Tec Equipment
Betreff: Re: [TenTec] Herc II idling collector current adjustment

Ken...

I agree completely.  While you've got it opened, though, you might
consider
changing out U5 on the distrib board.

73
Phil
VFO Stabilizers and PEP adapters for wattmeters...Check out
http://home.comcast.net/~k4dpk
----- Original Message ----- 
From: "Ken Brown" <ken.d.brown at verizon.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, February 21, 2005 5:13 PM
Subject: Re: [TenTec] Herc II idling collector current adjustment


> Thanks again Phil.
>
> The PA module idling currents were not high. With the amp not keyed
they
> were all zero. And keyed with no drive, they were all around 0.4 to
0.5
> Amp. I now have them adjusted to as close to 0.50 Amp as I can get.
>
> The Ic meter on the Hercules reads 12 Amps as soon as it is powered
on.
> The increase when keyed with no drive looks like 2A, but of course on
a
> 100 A scale, with divisions only every 25 A, that is difficult to
tell.
> When putting out 500 watts it reads 75 A and maybe 80 A at 550 watts.
> The 12 Amperes being indicated at power on, with no keying or drive,
> must not be an accurate indication. I suspect a DC offset in the
LM358s
> that are being used in the Ic monitoring circuitry. There is definitly
> not 12 A going to the PA modules with no drive to the amp.
>
> I have also measured the individual PA module currents with enough
drive
> to indicate 50 A on the Ic meter. This produces about 200 watts
output,
> and the currents to each PA module are all very close to 10 A each. So
> the modules are all working nearly equally hard, and there is a 10 to
12
> A offset in the Ic meter indication.
>
> Measuring full drive current draw of the PA modules would be a little
> more difficult. Most of the difficulty would be in finding the
> appropriate instrument, or making a shunt. From what I can see so far,
> there is not really any excessive current draw. I'm thinking about a
fan
> for the 9420 again.
>
> Ken  N6KB
>
> >With the amp turned on its side, and with the front panel at the
left,
> >looking at the amplifier boards:
> >
> >Bias board pots
> >R14 controls upper left amp
> >R10  controls upper right
> >R2  for lower left
> >R6 for lower right
> >
> >
> >
> >
> >
>
>
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec


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