I do like the idea of being able to plug the flex wire into the box for PSDR
connectivity independent of ddutil. I have at some times had stability issues
with ddutil and would like another path into the box. Also I would like to see
an output that would be compatable with previous X2
If you make the PA vapor phased cooled you can brew a demitasse of latte also
73 W9OY
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I had to try a couple of PC card-firewire interfaces before I found one that
was stable.
this is the one that wound up working
On 10/14/08 12:21 AM, Lee A Crocker [EMAIL PROTECTED] wrote:
I do like the idea of being able to plug the flex wire into the box for PSDR
connectivity independent of ddutil. I have at some times had stability issues
with ddutil and would like another path into the box. Also I would like
Ned:
Thanks for the reply.
Nope.. I tried that. It of course changed the averaging sample rate, but did
not have an effect on the stability of the visual signal on the panadapter
as I tuned toward it. The visual on the signal drops way down until I quit
tuning. I played with all the display
One highly-rated amp, the Yaesu Quadra, requires it. At least
according to the instruction manual. Not to replace the mic gain
control, but as an emergency exciter shutdown method. The ICOM PW-1
uses similar circuitry, IIRC.
What would happen to the Quadra if the antenna coax connector opened
At 10:52 AM 10/14/2008, Lux, James P wrote:
snip
In days of yore with an
analog system, tight coupling between amp and exciter comes almost for
free.. You bring some convenient bias control input out of the exciter and
drive it with a error signal of some sort from the amp. (then, you have to
On 10/14/08 8:06 AM, Jerry Flanders [EMAIL PROTECTED] wrote:
At 10:52 AM 10/14/2008, Lux, James P wrote:
snip
In days of yore with an
analog system, tight coupling between amp and exciter comes almost for
free.. You bring some convenient bias control input out of the exciter and
drive
At 11:36 AM 10/14/2008, Lux, James P wrote:
On 10/14/08 8:06 AM, Jerry Flanders [EMAIL PROTECTED] wrote:
At 10:52 AM 10/14/2008, Lux, James P wrote:
snip
In days of yore with an
analog system, tight coupling between amp and exciter comes almost for
free.. You bring some convenient bias
On 10/14/08 8:55 AM, Jerry Flanders [EMAIL PROTECTED] wrote:
At 11:36 AM 10/14/2008, Lux, James P wrote:
On 10/14/08 8:06 AM, Jerry Flanders [EMAIL PROTECTED] wrote:
At 10:52 AM 10/14/2008, Lux, James P wrote:
snip
In days of yore with an
analog system, tight coupling between amp
I think we have come to the same conclusion so there would be a PTT
line pass-thru and we will defeat it if the calibrated voltage is
exceeded (is exceeded t he right word for going too negative!)
Neal Campbell
www.abrohamnealsoftware.com
AIM:nealk3nc
On Oct 14, 2008, at 12:03 PM, Bob
Not sure why. The microchip (its going to be an Atmel ATMega128) will
sense voltage every 100 milliseconds and if the calibrated voltage for
that band is hit, it breaks continuiity of the ptt passthru line. I am
sure we could make the delay smaller but I am confused why you think
this is
I have two homebrew, solid state amps with no alc. The big amp (1kW)
has no protection, uses MRF 154s, and takes 15 watts to drive to full
power. I have accidently driven it with 100 W with no damage. The
small amp (600 W) uses 4 MRF 150s in parallel pushpull. I built over
drive
On 10/14/08 10:04 AM, Tom Thompson [EMAIL PROTECTED] wrote:
I have two homebrew, solid state amps with no alc. The big amp (1kW)
has no protection, uses MRF 154s, and takes 15 watts to drive to full
power. I have accidently driven it with 100 W with no damage. The
small amp (600 W)
Me either!
Neal Campbell K3NC
[EMAIL PROTECTED]
AIM:nealk3nc
telnet to our DX Spotting clusters at: dxc.k3nc.com, ports 12001 and 23
Devoted to Dogs: How to be your dog's best owner
Great Dog Book at www.abrohamneal.com
On Oct 14, 2008, at 11:55 AM, Jerry Flanders wrote:
At 11:13 AM 10/14/2008, Lux, James P wrote:
On 10/14/08 8:06 AM, Jerry Flanders [EMAIL PROTECTED] wrote:
At 10:52 AM 10/14/2008, Lux, James P wrote:
snip
In days of yore with an
analog system, tight coupling between amp and exciter comes almost for
free.. You bring some convenient bias
I think it would work well enough. When I get a round tuit, I hope to
make a gadget that will insert a 10 dB pad between the exciter and
the amplifier if the ALC voltage exceeds the setpoint. It would have
to be manually reset to resume full drive after tripping and would be
totally
On 10/14/08 11:49 AM, Jerry Flanders [EMAIL PROTECTED] wrote:
I think it would work well enough. When I get a round tuit, I hope to
make a gadget that will insert a 10 dB pad between the exciter and
the amplifier if the ALC voltage exceeds the setpoint. It would have
to be manually reset
I think I see the issue. The amps I have designed aim for time constants in
the microsecond range and rigs like the TS940 aim for time constants in the 1
second range.
How I have done this in the past is to use electronic bias in the amp and clamp
the bias in the case of overshoot. The real
On 10/14/08 6:48 AM, Frank Brickle [EMAIL PROTECTED] wrote:
On Tue, Oct 14, 2008 at 9:04 AM, Lux, James P [EMAIL PROTECTED]
wrote:
Remember
that the dttsp core has to get an input from the ALC signal, and then go in
and adjust the gain, which then changes the levels of the signals
On Tue, Oct 14, 2008 at 9:04 AM, Lux, James P [EMAIL PROTECTED]wrote:
Remember
that the dttsp core has to get an input from the ALC signal, and then go in
and adjust the gain, which then changes the levels of the signals emerging
from the DAC.
The DSP wouldn't ever see anything like an ALC
On 10/14/08 8:06 AM, Jerry Flanders [EMAIL PROTECTED] wrote:
At 10:52 AM 10/14/2008, Lux, James P wrote:
snip
In days of yore with an
analog system, tight coupling between amp and exciter comes almost for
free.. You bring some convenient bias control input out of the exciter and
drive
VERY sound advice.
Bob
ARRL SDR Working Group Chair
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
Trample the slow Hurdle the dead
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Lux, James P
Sent: Tuesday, October
On 10/14/08 9:21 AM, Lee A Crocker [EMAIL PROTECTED] wrote:
My guess is a PTT feedback scheme would be too slow to save your bacon unless
it somehow anticipates the fault.
It would also depend on the PTT sensing logic in the software to work.
Crowbar across the RF input?
-
Dudley
I am running a Tokyo Hy Power solid state amp HL-1.5KFX. The protection
circuits are very fast acting and I can only run the amp at about 25% of its
capability. Even at low 25 watt drive levels the peaks on the flex shoot over
100 watts tripping the protection circuitry. I have
There has been discussion here about some kind of external,
intelligent stunt box attached to the flexwire port in order to
provide interface to various things, e.g. ALC, antenna rotator
control, etc. Something key to me would be some sort of scripting
language that would become part of
After total failure with an IBM Thinkpad notebook (the firewire/cardbus
and all but the kitchen sink on irq16 - Windows just plain stopped
dead),
I finally have my new 5000A up and running on a MacBook Pro using
BootCamp/Windows XP (firewire is the only device on irq19).
Unfortunately I am in a
Hello Wayne,
I strongly recommend that you investigate small receiving loops. They
are much quieter than a dipole or vertical, and because of their very
sharp and deep nulls perpendicular to the plane of the loop, you can
null out local noise sources by simply rotating the loop to place the
In my opinion the protection hardware should reside in the amplifier not in
the flex box and not in the computer. The amp is where the $700 tube resides.
personally I don't see much need for ALC anyway. I have long called for a
scripting language for PSDR as long ago as the SDR-1000. Its
Jim,
You need to work with the ALC settings in the DSP tab.. I know quite a
few have played with these settings and had varying rate of success,
but you need to watch the ALC meter in TX window, you might need to
lower the time for the attack and raise the decay settings, but this
will
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