KSB2 misbehaving

[Bob Whelan]

Hi

Got a funny one - KSB2 chip/module seems to be recognised via the Auxbus
but doesn't seem to be doing anything when I change the settings with
the SSbA and SSbC commands.  Anybody got any idea if certain pins need
to be enabled before the chip will really work? Then I might be able to
track down the problem

Thanks for any ideas, it all seemed OK last time I tried it.

73 and HNY

Bob G3PJT
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[Sverre Holm-2]

> -----Original Message-----
> Got a funny one - KSB2 chip/module seems to be recognised via
> the Auxbus but doesn't seem to be doing anything when I
> change the settings with the SSbA and SSbC commands.  
>

If you measure the voltage on pin 11 of the KDSB2 processor (U1) you can see
if it toggles with the SSBA command, and the same with pins 23, 24, 25 for
SSBC. That should give you a clue whether the processor responds to the
commands or not.


73

Sverre
LA3ZA
http://www.qslnet.de/la3za/
 

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[W6IZT]

I am experiencing a low power output condition on the KPA100 on 15-10
meters. Power out on all other bands >100 watts.

Output/current draw from K2 measured at the BNC connector with the KPA100
disconnected: (PO28 set to 15w)
15 14w 2.9a
12 11w 2.5a
10 10w 2.5a

KPA 100 output
15 96w 20a
12 88w 17a
10 85w 20a

All component values in the LP filters on both the K2 and KPA100 have been
verified. SWR on the KPA100 LPFs is ok.

At this point I am suspecting soft PA transistors in the KPA 100.

Any feedback is greatly appreciated

73
Gregg


-----Original Message-----
From: [hidden email]
[mailto:[hidden email]]On Behalf Of Sverre Holm
Sent: Saturday, December 31, 2005 9:54 AM
To: 'Bob G3PJT'; [hidden email]
Subject: RE: [Elecraft] KSB2 misbehaving


> -----Original Message-----
> Got a funny one - KSB2 chip/module seems to be recognised via
> the Auxbus but doesn't seem to be doing anything when I
> change the settings with the SSbA and SSbC commands.
>

If you measure the voltage on pin 11 of the KDSB2 processor (U1) you can see
if it toggles with the SSBA command, and the same with pins 23, 24, 25 for
SSBC. That should give you a clue whether the processor responds to the
commands or not.


73

Sverre
LA3ZA
http://www.qslnet.de/la3za/


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[tom.w3qs]

Good Morning Group,

A lot has been written about interference from Ethernets, and I would like
to share my latest experiences.

After returning from a rather long hiatus from ham radio, I discovered an
obscene amount of interference on the ham bands.  I later learned that it
was largely the result of 6 Ethernet'ed computers in the house with cat 5
wiring running all over, and 3 runs going through the ham shack.

After eliminating as much interference as possible by fixing or dumping a
bunch of wall warts and noisy power strips, I was left with 269 noticeable
hetrodynes from 10 through 30 MHz.

This past week I eliminated all the Ethernet wiring and went totally
wireless.  Tiger Direct (with whom I have no affiliation) was offering a
D-Link wireless router + USB receiver for $40 and additional USB receivers
for $20.  Similar deals are all around us.

As of this morning, the 269 hetrodynes was down to 78, with 52 of those
positively attributable to the CRT monitor.  Of the remaining 26, many are
probably internal to the K2, being harmonically related.  I'll work on those
with another receiver later.

Anyway, bottom line:  If your experience was anything like mine, I recommend
looking into wireless.  The HF bands are sure quiet.

HAPPY NEW YEAR,

72,

Tom, W3QS

K2: 4991  


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[Tom Koeken]

Hi Tom

2 remarks:
1 If you are still using a CRT-screen for the PC than change it as soon as
possible for a TFT-screen. QRM of a conventional CRT-screen is enormous.

2 Please check on your (remaining) CAT5 cables; for ham-radio use they
should be shielded. They cost a few cents more, but they realy add by
eliminating unwanted radiation.

72/73 HNY Tom PC5D
K2/100 SN 2709


----- Original Message -----
From: "tom.w3qs" <[hidden email]>
To: <[hidden email]>
Sent: Saturday, December 31, 2005 4:08 PM
Subject: [Elecraft] Ether Nets and Interferrence, redux


> Good Morning Group,
>
> A lot has been written about interference from Ethernets, and I would like
> to share my latest experiences.

> As of this morning, the 269 hetrodynes was down to 78, with 52 of those
> positively attributable to the CRT monitor.  Of the remaining 26, many are
> probably internal to the K2, being harmonically related.  I'll work on
> those
> with another receiver later.
>


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[tom.w3qs]

Hi Guys,

The CRT will be replaced as soon as my bank balance recovers from Christmas.
I have managed to eliminate all cat5 cables except for the one between the
modem and the wireless router, and I moved that to the farthest point in my
house.  I think I will replace that last one with a shielded one since it
needs to be only a foot long.  A high gain antenna in that corner provides
maximum signal strength throughout the house and a block in every direction
outside.  Good thing you can encrypt your broadcast.

As to the wall warts and power strips, short of buying fat toroids, I just
threw the offenders away.  Oddly, about half the wall warts and half the
power strips were really bad, the rest were OK - couldn't find any
commonality among either the good or the bad.  I built a distribution box
for everything that needed 12 V and power it from my Astron 35.

None of the remaining interferences are really bad.  The interference from
the CRT is mostly just a trashy sound and I can copy through it.  Many of
the remaining hetrodynes are below S2.  Some probably come from the computer
and I'm sure some are from the K2, itself.

Tom

-----Original Message-----
From: Tom [mailto:[hidden email]]

Hi Tom

2 remarks:
1 If you are still using a CRT-screen for the PC than change it as soon as
possible for a TFT-screen. QRM of a conventional CRT-screen is enormous.

2 Please check on your (remaining) CAT5 cables; for ham-radio use they
should be shielded. They cost a few cents more, but they realy add by
eliminating unwanted radiation.

72/73 HNY Tom PC5D
K2/100 SN 2709


----- Original Message -----
From: "tom.w3qs" <[hidden email]>

> Good Morning Group,
>
> A lot has been written about interference from Ethernets, and I would like
> to share my latest experiences.

> As of this morning, the 269 hetrodynes was down to 78, with 52 of those
> positively attributable to the CRT monitor.  Of the remaining 26, many are
> probably internal to the K2, being harmonically related.  I'll work on
> those
> with another receiver later.
>




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