[Elecraft] Elecraft CW Net Announcement
Good Evening,
Dry, powder snow fell throughout the week. Today it got sunny so
most of it fell from the trees. There is still about two feet left with
another few feet on the way. Depending upon the temperature I may need
to shovel the roof. If I have a lot of snow when it starts raining it
gets heavy, very fast.
The sun has been active this week. At least two RF blackouts thus
far. A stream of solar wind is due on the 27th. That may affect the
forty meter net. Flux is not has high as last week but it is OK.
Sunset is changing quickly so forty meters will take a dive at some
point during the net. Earlier is better.
Please join us on (or near) :
14050 kHz at 2300z Sunday (3 PM PST Sunday)
7047 kHz at 0100z Monday (5 PM PST Sunday)
73,
Kevin. KD5ONS
-
"Microcosmic God" by Ted Sturgeon in C++ :)
unsigned int crossover(Gene g1, Gene g2)
{
unsigned int Msequence = g1.getSequence(); // ma gene sequence
unsigned int Psequence = g2.getSequence(); // pa gene sequence
int i = rand() % g1.getLength(); // determine point in
genes for crossover
Msequence >>= i;
Msequence <<= i;
Psequence <<= 32 - i; // if I use 30 instead of 32 I can
use those
Psequence >>= 32 - i; // two bits as a permanent marker
for special
// chromosomes
return Msequence | Psequence;
}
Plant(int x, int y, int energy=10, int age=1) : Organism(x, y, energy, age)
{
unsigned int seq = rand() % 8; // pollination
seq <<= 3;
seq |= rand() % 8; // poison probability
seq <<= 3;
seq |= rand() % 8; // spines
int len = 9; // 9 bits
m_plant = Gene(seq, len);
}
Herbivore(int x, int y, int energy=50, int age=1) : Animal(x, y, energy,
age)
{
unsigned int seq = rand() % 16; // run probability 4 bits (0-15)
seq <<= 4;
seq |= rand() % 16; // hide probability 4 bits (0-15)
seq <<= 4;
seq |= rand() % 16; // fight probability 4 bits
(0-15)
seq <<= 4;
seq |= rand() % 16; // camouflage 4 bits (0-15)
[quality of hiding]
seq <<= 4;
seq |= rand() % 16; // ability to eat marginal
food probability
int len = 20; // 20 bits
m_tactics = Gene(seq, len);
}
Carnivore(int x, int y, int energy=10, int age=1) : Animal(x, y, energy,
age)
{
unsigned int seq = rand() % 16; // attack probability 4 bits (0-15)
seq <<= 4;
seq |= rand() % 16; // rest probability 4 bits (0-15)
seq <<= 4;
seq |= rand() % 16; // hide probability 4 bits (0-15)
seq <<= 4;
seq |= rand() % 16; // camouflage 4 bits (0-15)
[quality of hiding]
seq <<= 4;
seq |= rand() % 16; // attack range 4 bits (0-15)
seq <<= 4;
seq |= rand() % 16; // pursuit time 4 bits (0-15)
int len = 24; // 24 bits
m_tactics = Gene(seq, len);
}
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Re: [Elecraft] RS232/ U1/ failure
Hello Geert.,
See that LT1039 ACN, has different pins'' lay out'' than
SN75...Looks for me that LT1039 is for socket installation?
73'Viggo LA9NEA
Den 25.02.2023 16:23, skrev Geert Jan de Groot:
> On 24/02/2023 21:46, elecraft-requ...@mailman.qth.net wrote:
>
>> When the K3 is in cold room ( below 5 degrees S) my K3/0 go in TERM
>> mode.
>> Hints say ''replace'' the U1 on the main KIO3 board..
>> Is the U1 SN75C1406 ( G4) ? Or can I use similar SN75 ?
>> Removed the top cover,and checked voltage , at gold plated test-point
>> close to the upper edge
>> of the main board +5.0 vdc. In the lower end of the SN75, test point at
>> the left side,seen from the front,,
>> start with approx + 0.35 vdc, and drops slowly to approx -0.50 vdc in 4
>> to 5 minutes
>> My K3 need ''warm up'' also for connecting via PC to K3 utility
>
> Looking at the schematics, I remember that Elecraft, in history, has used a
> number of different "logic to RS232 converter" chips. I think these changed
> as devices became obsolete,
>
> Both the SN75C1406 you mention in your other mail as well as the LT1039 that
> is in the K3 schematics (K3, not K3s) use a positive and a negative voltage.
> I would suggest checking the VCC8A voltage on your KIO3 board on pin 1 of
> your driver chip.
>
> For the negative voltage required, at least on the K3 schematics, there is an
> AF oscillator ("approx 1 kHz") and a FET and some diodes to create a charge
> pump to create the negative voltage. I would suggest checking the voltage
> (seems to be pin 9 for both devices) and I would expect around -10V or so.
>
> Given that "the problem solves when the radio warms up" my suspicion would be
> in the negative voltage generator. Specifically, check the electrolyt
> capacitors used in the charge pump.
>
> I am a but surprised to see the SN75C1406 reported in your board, because the
> LT1039 (listed in the K3 schematics) still has production status and seems to
> be on-stock with Mouser. I did *not* fully verify that these chips are
> interchangeable but I suspect a power supply problem (sketched above) rather
> than a broken driver, since broken driver chips do not tend to repair
> themselves with temperature.
>
> 73,
>
> Geert Jan PE1HZG
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Re: [Elecraft] RS232/ U1/ failure
Hello Geert !
Many thanks for your reply and info,
Checked the voltage on U1: SN75.. pin 1: + 13.2 vdc, pin 8 : -
2.54 vdc, pin 9:GND, pin 16: + 5 vdc.
Voltage on pin 8 is to low, - 7 vdc is the correct voltage if all ok...
If I can get a new U1 I will change it
My rig has serial number 2185,( buyed used from Netherland) :-)),,, I
looked at the chematic of K3 from
2010, and it is LT1039ACN.on U1.
So will try to find a new U1 replacment, try that first.
73' Viggo LA9NEA
Den 25.02.2023 16:23, skrev Geert Jan de Groot:
> On 24/02/2023 21:46, elecraft-requ...@mailman.qth.net wrote:
>
>> When the K3 is in cold room ( below 5 degrees S) my K3/0 go in TERM
>> mode.
>> Hints say ''replace'' the U1 on the main KIO3 board..
>> Is the U1 SN75C1406 ( G4) ? Or can I use similar SN75 ?
>> Removed the top cover,and checked voltage , at gold plated test-point
>> close to the upper edge
>> of the main board +5.0 vdc. In the lower end of the SN75, test point at
>> the left side,seen from the front,,
>> start with approx + 0.35 vdc, and drops slowly to approx -0.50 vdc in 4
>> to 5 minutes
>> My K3 need ''warm up'' also for connecting via PC to K3 utility
>
> Looking at the schematics, I remember that Elecraft, in history, has used a
> number of different "logic to RS232 converter" chips. I think these changed
> as devices became obsolete,
>
> Both the SN75C1406 you mention in your other mail as well as the LT1039 that
> is in the K3 schematics (K3, not K3s) use a positive and a negative voltage.
> I would suggest checking the VCC8A voltage on your KIO3 board on pin 1 of
> your driver chip.
>
> For the negative voltage required, at least on the K3 schematics, there is an
> AF oscillator ("approx 1 kHz") and a FET and some diodes to create a charge
> pump to create the negative voltage. I would suggest checking the voltage
> (seems to be pin 9 for both devices) and I would expect around -10V or so.
>
> Given that "the problem solves when the radio warms up" my suspicion would be
> in the negative voltage generator. Specifically, check the electrolyt
> capacitors used in the charge pump.
>
> I am a but surprised to see the SN75C1406 reported in your board, because the
> LT1039 (listed in the K3 schematics) still has production status and seems to
> be on-stock with Mouser. I did *not* fully verify that these chips are
> interchangeable but I suspect a power supply problem (sketched above) rather
> than a broken driver, since broken driver chips do not tend to repair
> themselves with temperature.
>
> 73,
>
> Geert Jan PE1HZG
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Re: [Elecraft] RS232/ U1/ failure
The ‘1406 is a rather ubiquitous chip - we use it many places in several
package styles. It started out life as the Motorola MC141406, and was picked up
by many other manufacturers.
You should be able to find a proper substitute from many manufacturers in the
package style you need in the KIO3.
I note that both Mouser and Digikey have an ample stock of the TI SN75C1406 at
this time.
73,
Jack, W6FB
> On Feb 25, 2023, at 9:23 AM, Geert Jan de Groot wrote:
>
> On 24/02/2023 21:46, elecraft-requ...@mailman.qth.net wrote:
>
>> When the K3 is in cold room ( below 5 degrees S) my K3/0 go in TERM
>> mode.
>> Hints say ''replace'' the U1 on the main KIO3 board..
>> Is the U1 SN75C1406 ( G4) ? Or can I use similar SN75 ?
>> Removed the top cover,and checked voltage , at gold plated test-point
>> close to the upper edge
>> of the main board +5.0 vdc. In the lower end of the SN75, test point at
>> the left side,seen from the front,,
>> start with approx + 0.35 vdc, and drops slowly to approx -0.50 vdc in 4
>> to 5 minutes
>> My K3 need ''warm up'' also for connecting via PC to K3 utility
>
> Looking at the schematics, I remember that Elecraft, in history, has used a
> number of different "logic to RS232 converter" chips. I think these changed
> as devices became obsolete,
>
> Both the SN75C1406 you mention in your other mail as well as the LT1039 that
> is in the K3 schematics (K3, not K3s) use a positive and a negative voltage.
> I would suggest checking the VCC8A voltage on your KIO3 board on pin 1 of
> your driver chip.
>
> For the negative voltage required, at least on the K3 schematics, there is an
> AF oscillator ("approx 1 kHz") and a FET and some diodes to create a charge
> pump to create the negative voltage. I would suggest checking the voltage
> (seems to be pin 9 for both devices) and I would expect around -10V or so.
>
> Given that "the problem solves when the radio warms up" my suspicion would be
> in the negative voltage generator. Specifically, check the electrolyt
> capacitors used in the charge pump.
>
> I am a but surprised to see the SN75C1406 reported in your board, because the
> LT1039 (listed in the K3 schematics) still has production status and seems to
> be on-stock with Mouser. I did *not* fully verify that these chips are
> interchangeable but I suspect a power supply problem (sketched above) rather
> than a broken driver, since broken driver chips do not tend to repair
> themselves with temperature.
>
> 73,
>
> Geert Jan PE1HZG
>
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Re: [Elecraft] RS232/ U1/ failure
On 24/02/2023 21:46, elecraft-requ...@mailman.qth.net wrote:
When the K3 is in cold room ( below 5 degrees S) my K3/0 go in TERM
mode.
Hints say ''replace'' the U1 on the main KIO3 board..
Is the U1 SN75C1406 ( G4) ? Or can I use similar SN75 ?
Removed the top cover,and checked voltage , at gold plated test-point
close to the upper edge
of the main board +5.0 vdc. In the lower end of the SN75, test point at
the left side,seen from the front,,
start with approx + 0.35 vdc, and drops slowly to approx -0.50 vdc in 4
to 5 minutes
My K3 need ''warm up'' also for connecting via PC to K3 utility
Looking at the schematics, I remember that Elecraft, in history, has
used a number of different "logic to RS232 converter" chips. I think
these changed as devices became obsolete,
Both the SN75C1406 you mention in your other mail as well as the LT1039
that is in the K3 schematics (K3, not K3s) use a positive and a negative
voltage. I would suggest checking the VCC8A voltage on your KIO3 board
on pin 1 of your driver chip.
For the negative voltage required, at least on the K3 schematics, there
is an AF oscillator ("approx 1 kHz") and a FET and some diodes to create
a charge pump to create the negative voltage. I would suggest checking
the voltage (seems to be pin 9 for both devices) and I would expect
around -10V or so.
Given that "the problem solves when the radio warms up" my suspicion
would be in the negative voltage generator. Specifically, check the
electrolyt capacitors used in the charge pump.
I am a but surprised to see the SN75C1406 reported in your board,
because the LT1039 (listed in the K3 schematics) still has production
status and seems to be on-stock with Mouser. I did *not* fully verify
that these chips are interchangeable but I suspect a power supply
problem (sketched above) rather than a broken driver, since broken
driver chips do not tend to repair themselves with temperature.
73,
Geert Jan PE1HZG
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