Re: [Elecraft] 80m KPA1500 High reflected power problems **SOLVED!**

[Peter Dougherty]

Hi folks,
FOUND THE PROBLEMMaybe??

I have a 30 foot vertical ground-plane style antenna that I use for diversity 
RX on 40 and 80, which was connected to the AUX antenna port. This was being 
overloaded by the QRO power from the TX antenna feedpoints just a few feet 
laterally and 40-50' higher vertically. As soon as I disconnected this antenna 
the problem went away.

NOTE that the problem only occurred on the lower CW portions of both 80 *and 
40*, as I found out tonight. In the SSB sections, even on CW transmit, there 
were no problems. But as I said, disconnecting the diversity AUX antenna solved 
the High SWR amp fault.

So now, the big question, is there some form of filtering within the K3s to 
disable receive on the AUX line during transmit, or do I have to look into a 
second "front end protector" device as I have on my K9AY loop connected to the 
RX IN port. Or perhaps some other valid solution?

At least I'm glad I finally have full operation back on 40 and 80!

 - pjd


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[Elecraft] Elecraft CW Net Report

[kevinr]

Good Evening,

   Twenty meters had a steady, windy sound to it.  QSB was medium slow 
but signals were weaker than last week.  Forty meters was stronger but 
the QSB was deeper.  I was told of thunderstorms in California but could 
not hear any lightning static.  There were a few whistlers and the 
steady hissing sound.



  On 14049.5 kHz at 2200z:

W0CZ - Ken - ND

K6XK - Roy - IA

K4JPN - Steve - GA

K4TO - Dave - KY


  On 7047 kHz at z:

K6XK - Roy - IA

K6PJV - Dale - CA

W6JHB - Jim - CA

AE6JV - Bill - CA

K0DTJ - Brian - CA

W0CZ - Ken - ND


March has come in like a glacier.  Hopefully it will end with rain, mud, 
and a few flowers.



73,

 Kevin.  KD5ONS

-



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[Elecraft] ALC

[Bill Levy]

Never used it on the S Line, never ever on Elecraft. Watch my drive, watch my 
waveforms, it was invented in the olden days to keep lids from splattering. 

Just not necessary. Limit your drive. Voice peaks matter. It’s so much easier 
now I don’t know why it’s still included on radios and amps. 

Been transmitting for over 50 years. Never told I was overdriving. 

RFI is a different animal. Don’t confuse the two. 

73, Bill N2WL 
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[Elecraft] K3S passes 5 & 50w tests but . . .

[David Windisch]

Hi, all concerned:
My previously-owned K3S sn 11000+ passes the 5W & 50W tests, but won't
output more CW power than:
70W on 160M
80W on 80M
90W on 30M
70W on 15M.
The rig goes right to 110W on the remaining bands.
I suspect bandpass alignment problems, 
or forbidden adjustment of caps/pots, 
and request alternative suspicions and procedural suggestions from the
august and puissant group, pls.
Brgds,
Dave, N3HE



-
Brgds,
Dave, N3HE
Cincinnati OH
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[Elecraft] [K3S] sub receiver filter recommendation

[Robert G Strickland via Elecraft]

I am migrating my K3 [Ser# 6232] to a K3S with a sub-receiver. In the 
K3S main receiver I will have the following crystal filters from the K3:


2.8Kc 8-pole Elecraft
1.9kc ?-pole Elecraft
0.5kc 8-pole Inrad
0.2kc 5-pole Elecraft

I operate almost exclusively CW in contests and DX chasing. in contests, 
I anticipate using the sub-receiver in a SO2V arrangement, the main 
receiver in S and the sub- in running. Given this operating 
arrangement, which single crystal filter in the sub- would be "best?" I 
understand that personal preferences play a big part in choosing a 
filter, yet I'm wondering if there's a broad consensus in the filter 
width that most folks choose, most of the time, in this application. 
Thanks in advance for any and all opinions and advice.


...robert
--
Robert G Strickland, PhD ABPH - KE2WY
rc...@verizon.net.usa
Syracuse, New York, USA
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Re: [Elecraft] [K3] Spontaneous HI CUR, audio reduction in RX mode - UPDATE

[Mike K8CN]

I may have found the cause of the anomalous HI CUR warning in **receive**
mode, thanks to my big orange Maine coon cat, Mr. Opie.  In rubbing his chin
on the VFO B knob while I was listening last night, he rotated the control
to the 12V DC bus voltage display, which I then noticed was oscillating
between 13.6 V and 12.7 V.  When I checked the DC bus current display, it
was oscillating between 0.4 A and 2.1 A - clearly something was amiss. 

Tonight I checked the terminal voltage on my Astron RS20-A linear supply,
and found it to be stable at 13.7 V with no load (K3 turned off), but then
it dropped to 13.4 V with the K3 'on' in receive mode.  I again checked the
K3's internal volt/ammeter readings and found the same periodic oscillation
in each one.  Curious to know if the oscillation was due to an interaction
with the supply regulator, I swapped out the RS20-A for my Astron SS-30
SMPS, which I normally use with my K2/100 setup.

Lo and behold, the DC bus oscillations ceased!  

I have not yet spent enough time listening using the alternate power supply
to know if the HI CUR warnings will also cease, but will do so over the
coming week. Fortunately, I don't have to watch the K3 display because the
HI CUR condition also reduces headphone audio substantially, which gets my
immediate attention.

Kudos to Mr. Opie for his uncanny sense of what might reveal a potential
cause of the spontaneous HI CUR warnings in receive mode.

73,
Mike, K8CN



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[Elecraft] K3s - Low Output Power

[Ed Lambert]

My K3s has been in service for several years. Power output has always easily
reached roughly 100 watts.

 

Now, with:

1.  ATU TUNE bypassed
2.  Good 50 ohm dummy load
3.  W1 in line with the load
4.  SWR 1:1

 

Next:

1.  With the PWR control set to show 100 watts on the LCD
2.  Select TUNE
3.  W1 shows about 80 watts output
4.  K3s LCD PWR display shows roughly 80 watts (both the "analog"
display and the numerical display) (depending on band)

 

I just used the K3 Utility to insure my firmware is up to date. It is. And,
I used the Utility to calibrate the transmitter gain. This did NOT change
the results of my power measurements.

 

I am hoping I am making a bone-headed mistake.

 

Ed

KD3Y

 

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[Elecraft] Noise with amp

[Robert Hand]

   I’m seeing the same thing with my KPA1500. All bonding is good. It appears 
on ten meters with about 10-dB and with about 15-dB on six meters. 
Sent from my iPhone
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Re: [Elecraft] ALC control of W6PQL amp from my K3

[Bob McGraw K4TAX]

I connect the computer to my K3S with one USB cable.  That's all that's needed 
as it handles all of the signals and commands.  KISS!Works great. 

Bob, K4TAX


Sent from my iPhone

> On Mar 10, 2019, at 4:51 PM, Bill Frantz  wrote:
> 
> I lost the SignaLink as well, but I think a lot of readers of this list use 
> one.
> 
> I currently use the internal "sound card" in my upgraded K3, or a home brew 
> interface based on a $5 sound card from Amazon on my KX3.
> 
> 73 Bill AE6JV
> 
>> On 3/10/19 at 2:40 PM, wes_n...@triconet.org (Wes) wrote:
>> 
>> True to a point.  I would (and did) lose the SignaLink.  I use my Lenovo 
>> laptop's internal sound card, even with a K3S.
>> 
>> Wes  N7WS
>> 
>>> On 3/10/2019 2:16 PM, Bill Frantz wrote:
>>> What makes Don's excellend advice harder is that there may be as many as 4 
>>> audio level controls between the computer and the transmitter. (The one in 
>>> the program, the OS's control, one on the interface box (SignaLink), and 
>>> the one on the radio.)
>>> 
>>> My solution is to have all but one, the one in the program, set to constant 
>>> values, so they can be quickly set.
>>> 
>>> 73 Bill AE6JV
> 
> -
> Bill Frantz| The first thing you need when  | Periwinkle
> (408)356-8506  | using a perimeter defense is a | 16345 Englewood Ave
> www.pwpconsult.com | perimeter. | Los Gatos, CA 95032
> 
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Re: [Elecraft] ALC control of W6PQL amp from my K3

[Bill Frantz]

I lost the SignaLink as well, but I think a lot of readers of 
this list use one.


I currently use the internal "sound card" in my upgraded K3, or 
a home brew interface based on a $5 sound card from Amazon on my KX3.


73 Bill AE6JV

On 3/10/19 at 2:40 PM, wes_n...@triconet.org (Wes) wrote:

True to a point.  I would (and did) lose the SignaLink.  I 
use my Lenovo laptop's internal sound card, even with a K3S.


Wes  N7WS

On 3/10/2019 2:16 PM, Bill Frantz wrote:
What makes Don's excellend advice harder is that there may be 
as many as 4 audio level controls between the computer and the 
transmitter. (The one in the program, the OS's control, one on 
the interface box (SignaLink), and the one on the radio.)


My solution is to have all but one, the one in the program, 
set to constant values, so they can be quickly set.


73 Bill AE6JV


-
Bill Frantz| The first thing you need when  | Periwinkle
(408)356-8506  | using a perimeter defense is a | 16345 
Englewood Ave
www.pwpconsult.com | perimeter. | Los Gatos, 
CA 95032


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Re: [Elecraft] ALC control of W6PQL amp from my K3

[Wes]

True to a point.  I would (and did) lose the SignaLink.  I use my Lenovo 
laptop's internal sound card, even with a K3S.


Wes  N7WS

On 3/10/2019 2:16 PM, Bill Frantz wrote:
What makes Don's excellend advice harder is that there may be as many as 4 
audio level controls between the computer and the transmitter. (The one in the 
program, the OS's control, one on the interface box (SignaLink), and the one 
on the radio.)


My solution is to have all but one, the one in the program, set to constant 
values, so they can be quickly set.


73 Bill AE6JV 


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Re: [Elecraft] ALC control of W6PQL amp from my K3

[Don Wilhelm]

TUNE is a bit different than normal operating.  The power control is not 
as tight.
I am speaking from my K2 experience, but the K3 has about the same power 
control mechanism


73,
Don W3FPR

On 3/10/2019 5:03 PM, John Simmons wrote:

I have seen overshoot in the TUNE mode.

-John NI0K



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Re: [Elecraft] ALC control of W6PQL amp from my K3

[Bill Frantz]

What makes Don's excellend advice harder is that there may be as 
many as 4 audio level controls between the computer and the 
transmitter. (The one in the program, the OS's control, one on 
the interface box (SignaLink), and the one on the radio.)


My solution is to have all but one, the one in the program, set 
to constant values, so they can be quickly set.


73 Bill AE6JV

On 3/10/19 at 12:40 PM, donw...@embarqmail.com (Don Wilhelm) wrote:

If your data mode application has a "POWER" slider, it is not 
properly named (complain to Joe Taylor) - it is just another 
audio level control.


---
Bill Frantz| "The only thing we have to   | Periwinkle
(408)356-8506  | fear is fear itself." - FDR  | 16345 
Englewood Ave
www.pwpconsult.com | Inaugural address, 3/4/1933  | Los Gatos, 
CA 95032


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Re: [Elecraft] ALC control of W6PQL amp from my K3

[John Simmons]

I have seen overshoot in the TUNE mode.

-John NI0K


Don Wilhelm 
Sunday, March 10, 2019 2:40 PM
I am left wondering if some K3 users who are seeing "Overshoot" are 
actually seeing what is referred to as "Power Hunting".
That would occur mostly in Voice or DATA modes when the audio level is 
not set high enough.


With insufficient audio, the K3 can initially go up to the set power, 
and then will quickly settle back to a low power, and then gradually 
climb to the full power set by the power knob - that behavior is 
seldom seen in CW mode, but can be seen in DATA modes and Voice modes 
if the audio levels are not set correctly.


The cure for that behavior is to drive the audio as indicated in the 
manual.  For voice modes, adjust the MIC Gain to produce 5 to 7 bars 
on the ALC meter.
For DATA modes, adjust the audio levels to produce 4 bars solid with 
the 5th bar flashing.


If your data mode application has a "POWER" slider, it is not properly 
named (complain to Joe Taylor) - it is just another audio level control.


The Elecraft transceivers control power differently than all other 
amateur transceivers, so ignore the common internet advice to control 
the power with the audio level.  Set the audio as indicated in my 
website article (same information is in the K3/K3S/KX3/KX2 manual) and 
adjust the desired power with the POWER knob.


Other transceivers may be able to use the audio level to control the 
output power, but Elecraft transceivers are different, do not "do it 
that a-way".


Look at the article on my website www.w3fpr.com.  Scroll down the left 
column and click to open the document.


BTW: The originator of this thread is now on the right track, I have 
exchanged several email messages with him (and I built his transverters).


73,
Don W3FPR


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Jim Brown 
Sunday, March 10, 2019 2:02 PM


I've had an LP100 in line for several years, always set to read peak 
power, and the most overshoot I've seen from either of my two K3s is 
less than 1 dB. The K3s are driving a pair of 87As, and I have NEVER 
used ALC between rig and amp.


The earliest advice I've seen about this was in the user manual for 
the Ten Tec Titan 425, designed around 1979, and using a pair of the 
same 3CX8007 triodes used in the 87A. The manual said that ALC output 
was provided only for historical reasons, and advised against using it 
to control output power.


When you look ONLY at output power, you miss the mess that ALC causes. 
To see it, you must look at (or listen to) the transmitted frequency 
spectrum. A P3 on a second radio, or an SDR receiver will clearly 
reveal the splatter and clicks.


73, Jim K9YC

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John Simmons 
Sunday, March 10, 2019 1:34 PM
Wes,

Once I got my LP100, I began to see the same behavior with my K3. This 
type of output anomaly is a huge reason to use ALC.


73,
-John NI0K


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Wes 
Sunday, March 10, 2019 9:39 AM
Indeed.  Folks who would never think to turn off the AGC in their 
receivers get weak-kneed at the thought of AGC (ALC) being used in the 
transmit loop.  In "Fundamentals of SSB", Collins radio speaks of ALC 
(pp.7-10,11) without any negativity, and in fact calls it a form of 
speech compression.  As in many things, the devil is in the details.


I suspect most of the Elecraft faithful would also be surprised to 
know that their beloved K3s use internal ALC as well as digital power 
control. This is not perfect, I've observed overshoot, power slowly 
increasing to set level and low level power jitter*.


* You need a spectrum analyzer to see this and it's unlikely to be 
heard on the air, but it's there.


Wes  N7WS



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Re: [Elecraft] ALC control of W6PQL amp from my K3

[Don Wilhelm]

I am left wondering if some K3 users who are seeing "Overshoot" are 
actually seeing what is referred to as "Power Hunting".
That would occur mostly in Voice or DATA modes when the audio level is 
not set high enough.


With insufficient audio, the K3 can initially go up to the set power, 
and then will quickly settle back to a low power, and then gradually 
climb to the full power set by the power knob - that behavior is seldom 
seen in CW mode, but can be seen in DATA modes and Voice modes if the 
audio levels are not set correctly.


The cure for that behavior is to drive the audio as indicated in the 
manual.  For voice modes, adjust the MIC Gain to produce 5 to 7 bars on 
the ALC meter.
For DATA modes, adjust the audio levels to produce 4 bars solid with the 
5th bar flashing.


If your data mode application has a "POWER" slider, it is not properly 
named (complain to Joe Taylor) - it is just another audio level control.


The Elecraft transceivers control power differently than all other 
amateur transceivers, so ignore the common internet advice to control 
the power with the audio level.  Set the audio as indicated in my 
website article (same information is in the K3/K3S/KX3/KX2 manual) and 
adjust the desired power with the POWER knob.


Other transceivers may be able to use the audio level to control the 
output power, but Elecraft transceivers are different, do not "do it 
that a-way".


Look at the article on my website www.w3fpr.com.  Scroll down the left 
column and click to open the document.


BTW: The originator of this thread is now on the right track, I have 
exchanged several email messages with him (and I built his transverters).


73,
Don W3FPR

On 3/10/2019 3:02 PM, Jim Brown wrote:

On 3/10/2019 11:34 AM, John Simmons wrote:
Once I got my LP100, I began to see the same behavior with my K3. This 
type of output anomaly is a huge reason to use ALC. 


I've had an LP100 in line for several years, always set to read peak 
power, and the most overshoot I've seen from either of my two K3s is 
less than 1 dB. The K3s are driving a pair of 87As, and I have NEVER 
used ALC between rig and amp.



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Re: [Elecraft] ALC control of W6PQL amp from my K3

[Bob McGraw K4TAX]

And with my P3 or SDR when one closely examines a signal, the evidence of 
improper ALC usage or ALC overshoot is very prominent with many signals. 

The sad thing is that it can be corrected with proper settings and usage.  
There is no need to occupy 10kHz of the band. And just listening to a signal 
usually doesn't disclose this nasty artifact. 

Bob, K4TAX


Sent from my iPhone

> On Mar 10, 2019, at 2:02 PM, Jim Brown  wrote:
> 
>> On 3/10/2019 11:34 AM, John Simmons wrote:
>> Once I got my LP100, I began to see the same behavior with my K3. This type 
>> of output anomaly is a huge reason to use ALC. 
> 
> I've had an LP100 in line for several years, always set to read peak power, 
> and the most overshoot I've seen from either of my two K3s is less than 1 dB. 
> The K3s are driving a pair of 87As, and I have NEVER used ALC between rig and 
> amp.
> 
> The earliest advice I've seen about this was in the user manual for the Ten 
> Tec Titan 425, designed around 1979, and using a pair of the same 3CX8007 
> triodes used in the 87A. The manual said that ALC output was provided only 
> for historical reasons, and advised against using it to control output power.
> 
> When you look ONLY at output power, you miss the mess that ALC causes. To see 
> it, you must look at (or listen to) the transmitted frequency spectrum. A P3 
> on a second radio, or an SDR receiver will clearly reveal the splatter and 
> clicks.
> 
> 73, Jim K9YC
> 
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Re: [Elecraft] KPA/KAT500 Mystery Fail - solved

[kd4iz]

Thanks to some (kind advice and well deserved goading) from Mike, K6MKF and 
Ken, WA2LBI – I worked out the issue – unfortunately the fix appears to be a 
visit to ICOM repair if access to components is as bad as I fear.

 

For the general edification of other ICOM 7XXX owners:

Two KEY control lines go from the ICOM 7100 and 7300 rigs to the KPA/KAT500 
combo. 

1.  The ICOM Molex connector KEY line is part of the TUNE/operate trigger 
function to the KAT500 along with the START line.  
2.  Pin #3 (HSEND) of the 13 pin DIN connector is the KEY function used by 
the KPA500 KEY line input. It is a bi-directional line.

 

Normally, HSEND appears to float at about 6 volts. If this line is pulled low 
by external equipment, the transceiver is keyed. When the transceiver is keyed, 
the line is pulled low, keying external equipment. Maximum line current 200ma. 
This is what the 7300 was doing… so all was OK there but... My 7100 showed an 
HSEND float voltage of 2.3V and did not drop to ground when the rig was keyed – 
apparently the keying circuit is smoked. Looks like there is a diode in between 
the circuitry and the connector (hope-hope). Not sure why this blew because 
these puppies have been in use with the KPA500 and relatively trouble free for 
a while from what I understand… probably operator error/shuffle static damage 
on my part. Glad it wasn’t a KAT/KPA500 issue.

 

Thanks for your patience,

 

KD4IZ

Jack Spitznagel

FM19oo

 

 

 

From: Ken Winterling  
Sent: Sunday, March 10, 2019 11:33
To: kd...@frawg.org
Cc: Elecraft Reflector 
Subject: Re: [Elecraft] KPA/KAT500 Mystery Fail

 

Jack,

 

I assume the two cables you use are the RF coax cable and the PTT keying line, 
correct?  The keying line should connect from the rig, then to the KAT500, and 
finally the KPA500.  This allows the KAT500 to disable the keying for the 
KPA500 during tuning or high SWR conditions.

 

It is possible that with moving the cables between the two rigs the keying line 
cable has been damaged.  I have seen this before where a cable works fine in 
one jack but not in another.  It is a matter of the cable being in just the 
right position.  If you rotate it slightly it goes OC (Open Circuit). 

 

To simplify troubleshooting I would eliminate the KAT500 and plug the keying 
line directly from the IC-7100 into the KPA500.  Put the amp on a dummy load.

 

You said the '7100 doesn't key the KPA500.  You can check the KPA500 display 
for an asterisk (*) on the left side indicating that the amp is receiving a 
keying signal (contact closure to ground) from the rig ('7100).  If you do not 
see that asterisk (*) then the amp is not  being keyed by the rig.  Try a 
different cable to the rig.  

 

If that doesn't work then try leaving the keying cable plugged into the amp and 
unplugging the cable from the rig.  Touch to ground the center conductor of the 
end of the cable you removed from the rig.  It should key the amp and show the 
asterisk (*) in the display.  If the amp keys with the cable grounded then it 
it time to look at the keying jack/circuit of the IC-7100.

 

Let us know what you find.

 

Ken

WA2LBI

 

 

 

 

On Sun, Mar 10, 2019 at 10:28 AM mailto:kd...@frawg.org> > 
wrote:

All,

I have been using the KPA500/KAT500 combo with an IC-7300 and an IC-7100 for
around a year now. They are cabled and configured as per the Elecraft device
manuals. The cabling is identical for the two transmitters (actually, I use
the same 2 cables for both). All has been working properly with both radios
until very recently. The amp and the tuner continue to behave properly with
the 7300. 

 

The KAT500 continues to work perfectly with the 7100, however the
KPA500 no longer band switches when I change bands on the 7100 and key up.
In addition, the amplifier will not key. The 7100 still can put out full
power with the KAT500 in line. I have not changed any setting in any of the
3 devices to my knowledge. It is like the KPA500 has become deaf to the
IC-7100.

After switching back and forth and looking at all device settings, I am
baffled at this point! Is there anything in the way of rig to amplifier line
signals that could inhibit band switching by the amplifier but not by the
antenna tuner?

Thanks for your thoughts.

KD4IZ

Jack Spitznagel

FM19oo

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Re: [Elecraft] ALC control of W6PQL amp from my K3

[Jim Brown]

On 3/10/2019 11:34 AM, John Simmons wrote:
Once I got my LP100, I began to see the same behavior with my K3. This 
type of output anomaly is a huge reason to use ALC. 


I've had an LP100 in line for several years, always set to read peak 
power, and the most overshoot I've seen from either of my two K3s is 
less than 1 dB. The K3s are driving a pair of 87As, and I have NEVER 
used ALC between rig and amp.


The earliest advice I've seen about this was in the user manual for the 
Ten Tec Titan 425, designed around 1979, and using a pair of the same 
3CX8007 triodes used in the 87A. The manual said that ALC output was 
provided only for historical reasons, and advised against using it to 
control output power.


When you look ONLY at output power, you miss the mess that ALC causes. 
To see it, you must look at (or listen to) the transmitted frequency 
spectrum. A P3 on a second radio, or an SDR receiver will clearly reveal 
the splatter and clicks.


73, Jim K9YC

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Re: [Elecraft] P3 SPAN Instability

[Victor Rosenthal 4X6GP]

No, the save/restore restored everything to how it was before.


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 10 Mar 2019 20:57, Dave Cole (NK7Z) wrote:
I have been thinking of that.  When you did it, was your P3 revocered to 
the same exact setup as when you saved the config file?  Did you have to 
resetup anything else?


73s and thanks,
Dave (NK7Z)
https://www.nk7z.net
Award Manager, 30MDG Grid Awards
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL OOC for Oregon

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Re: [Elecraft] P3 SPAN Instability

[Dave Cole (NK7Z)]

I have been thinking of that.  When you did it, was your P3 revocered to 
the same exact setup as when you saved the config file?  Did you have to 
resetup anything else?


73s and thanks,
Dave (NK7Z)
https://www.nk7z.net
Award Manager, 30MDG Grid Awards
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL OOC for Oregon

On 3/10/19 10:13 AM, Victor Rosenthal 4X6GP wrote:
I've never had any trouble with REF LEVEL, but it can't hurt to try the 
save / reset / restore routine and see if it helps.


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/


On 10/03/2019 18:14, Dave Cole (NK7Z) wrote:

I am seeing something similar to this as well...  Not in SPAN, but in
 REF LVL.  I set REF LVL while on 30 Meters, and leave the band. 
Ssometimes when I return to 30, I need to touch the REF LVL level to

get it to return...

By touch, I mean I select REF LVL, then just turn the knob ever so 
slightly.  The P3 then reverts to where it should be...


P3 with SVGA, and power monitor.  Only on 30 meters...  Any
suggestions?

73s and thanks, Dave (NK7Z) https://www.nk7z.net Award Manager, 30MDG
Grid Awards ARRL Technical Specialist ARRL Volunteer Examiner ARRL
OOC for Oregon

On 3/10/19 8:06 AM, Victor Rosenthal 4X6GP wrote:

I had a problem in which both SPAN and CENTER changed arbitrarily
(it seemed) on band changes. I finally saved the configuration
using the P3 Utility, reset the P3 to factory parameters (power
off, hold LABELS while powering on, wait for 2 seconds, let go of
LABELS), and finally used the utility to restore the
configuration. The problem hasn't recurred -- it's been a few weeks
and it was pretty much a daily occurrence. YMMV.


73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO CWops no. 5 
http://www.qsl.net/k2vco/


On 10/03/2019 16:51, Gary J Ferdinand wrote:

Various searches dredged up nothing helpful.  I recently
developed a P3 problem.  The SPAN does not get saved.  Whenever I
change bands to a band I had set it, say, to 50 kHz, the SPAN
resets itself to 5 kHz. Sometimes I can even watch the display as
it cranks down the bandwidth.

This is a P3 *without* SVGA, but *with* TXMon.  It has 1.60
firmware installed and reloaded without effect.  It is not
directly connected to a PC. The transceiver to which it is
connected is a K3S.

P3 SPAN settings:  SpanScale: REF LEVEL ONLY, SteppedSpan:  OFF

I appreciate any pointers to where I should look.  Thanks.

73/Gary W2CS

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[Elecraft] west mountain computer speakers power input

[Arthur Nienhouse]

*/Thanks Jim
I misplaced the wall wort or the input info, so its 12 volts at 2 amp 
positive on the center pin, thanks for the help guys


Regards
Art
ka9zap
/*
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Re: [Elecraft] ALC control of W6PQL amp from my K3

[John Simmons]

Wes,

Once I got my LP100, I began to see the same behavior with my K3. This 
type of output anomaly is a huge reason to use ALC.


73,
-John NI0K


Wes 
Sunday, March 10, 2019 9:39 AM
Indeed.  Folks who would never think to turn off the AGC in their 
receivers get weak-kneed at the thought of AGC (ALC) being used in the 
transmit loop.  In "Fundamentals of SSB", Collins radio speaks of ALC 
(pp.7-10,11) without any negativity, and in fact calls it a form of 
speech compression.  As in many things, the devil is in the details.


I suspect most of the Elecraft faithful would also be surprised to 
know that their beloved K3s use internal ALC as well as digital power 
control. This is not perfect, I've observed overshoot, power slowly 
increasing to set level and low level power jitter*.


* You need a spectrum analyzer to see this and it's unlikely to be 
heard on the air, but it's there.


Wes  N7WS



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Re: [Elecraft] KPA/KAT500 Mystery Fail

[kd4iz]

Hi Ken, All,

 

Mike, N6MKF, sent me a direct email recommending that I try cleaning the 
connectors. I followed his recommendations again. No joy.

 

The 7100 does not behave as a “generic” rig. Remember that the more recent 
ICOM’s all use a 4 pin Molex for their ATU connection and have a 13 pin DIN 
connector that has all the other coding data and audio on it. Please see the 
cabling instructions on pages 8-10 in the KAT500 manual to see the wiring I use.

 

I checked the RF run: The coax cable is connected through an antenna switch to 
the KPA500 which in turn runs to the ATU. If I by pass the switch, the behavior 
is the same. AFAICT that path is fine.

 

The * (asterisk) does not show when the 7100 is keyed, so it appears that 
either the 7100’s HSEND line in the 13 pin DIN or the KEY line in the Molex is 
the issue. Basically the KEY line is the not the only key line signal… and 
HSEND is “bi-directional” so that complicates things. I am not sure which one 
is routed to the KPA (or if they interact somehow).

 

I know the KPA/KAT side is behaving as it should because they work with the 
7300, so I will check both lines in both rigs and compare what they do when 
keyed. Probably the only way to tell if something needs repair or a connector 
is not making contact in the 7100.

 

Thanks for thinking this through with me.

 

KD4IZ

Jack Spitznagel

FM19oo

 

 

 

 

From: Ken Winterling  
Sent: Sunday, March 10, 2019 11:33
To: kd...@frawg.org
Cc: Elecraft Reflector 
Subject: Re: [Elecraft] KPA/KAT500 Mystery Fail

 

Jack,

 

I assume the two cables you use are the RF coax cable and the PTT keying line, 
correct?  The keying line should connect from the rig, then to the KAT500, and 
finally the KPA500.  This allows the KAT500 to disable the keying for the 
KPA500 during tuning or high SWR conditions.

 

It is possible that with moving the cables between the two rigs the keying line 
cable has been damaged.  I have seen this before where a cable works fine in 
one jack but not in another.  It is a matter of the cable being in just the 
right position.  If you rotate it slightly it goes OC (Open Circuit). 

 

To simplify troubleshooting I would eliminate the KAT500 and plug the keying 
line directly from the IC-7100 into the KPA500.  Put the amp on a dummy load.

 

You said the '7100 doesn't key the KPA500.  You can check the KPA500 display 
for an asterisk (*) on the left side indicating that the amp is receiving a 
keying signal (contact closure to ground) from the rig ('7100).  If you do not 
see that asterisk (*) then the amp is not  being keyed by the rig.  Try a 
different cable to the rig.  

 

If that doesn't work then try leaving the keying cable plugged into the amp and 
unplugging the cable from the rig.  Touch to ground the center conductor of the 
end of the cable you removed from the rig.  It should key the amp and show the 
asterisk (*) in the display.  If the amp keys with the cable grounded then it 
it time to look at the keying jack/circuit of the IC-7100.

 

Let us know what you find.

 

Ken

WA2LBI

 

 

 

 

On Sun, Mar 10, 2019 at 10:28 AM < > wrote:

All,

I have been using the KPA500/KAT500 combo with an IC-7300 and an IC-7100 for
around a year now. They are cabled and configured as per the Elecraft device
manuals. The cabling is identical for the two transmitters (actually, I use
the same 2 cables for both). All has been working properly with both radios
until very recently. The amp and the tuner continue to behave properly with
the 7300. 

 

The KAT500 continues to work perfectly with the 7100, however the
KPA500 no longer band switches when I change bands on the 7100 and key up.
In addition, the amplifier will not key. The 7100 still can put out full
power with the KAT500 in line. I have not changed any setting in any of the
3 devices to my knowledge. It is like the KPA500 has become deaf to the
IC-7100.

After switching back and forth and looking at all device settings, I am
baffled at this point! Is there anything in the way of rig to amplifier line
signals that could inhibit band switching by the amplifier but not by the
antenna tuner?

Thanks for your thoughts.

KD4IZ

Jack Spitznagel

FM19oo

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[Elecraft] Elecraft CW Net Announcement

[kevinr]

Good Morning,

   Check the new net times.  I wanted to keep the propagation instead 
of moving the nets.  So I did not change the Universal times but rather 
the local times.  If I would have used my normal methods the propagation 
would be much different.


   Now, hopefully, there will be some propagation.  There are a couple 
CMEs due which may or may not strike the earth.  The one active sunspot 
sent a few G1 class flares in our direction has the potential for flares 
in the C class.  In another year or two we will see a more active sun.  
Now if only it would stop snowing.



Please join us tomorrow on:

14050 kHz at 2200z Sunday (3 PM PDT Sunday)
 7047 kHz at z Monday (5 PM PDT Sunday)

73,
Kevin. KD5ONS

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Re: [Elecraft] west mountain com speaker power supply info

[Larry (K8UT)]

Art,

I have two pair of those speakers - one pair from the PC audio and the 
other from the two K3 audio channels. I run them both from my shack 12 
VDC power supply. (i hate wall warts)


-larry (K8UT)

-- Original Message --
From: "Arthur Nienhouse" 
To: Elecraft@mailman.qth.net
Sent: 2019-03-10 13:59:14
Subject: [Elecraft] west mountain com speaker power supply info


/*Can anyone help with power in put for the twin speakers west mountain is 
selling COM spkr computer spk
system.. CS1 # 58409 950

The back is labeled DC IN but nothing as to voltage and pin out.
There is nothing I can find on there web site or internet.

Any help would be greatly appreciated
Regards
Art
ka9zap
*/
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[Elecraft] west mountain com speaker power supply info

[Arthur Nienhouse]

/*Can anyone help with power in put for the twin speakers west mountain 
is selling COM spkr computer spk

system.. CS1 # 58409 950

The back is labeled DC IN but nothing as to voltage and pin out.
There is nothing I can find on there web site or internet.

Any help would be greatly appreciated
Regards
Art
ka9zap
*/
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Re: [Elecraft] P3 SPAN Instability

[Victor Rosenthal 4X6GP]

I've never had any trouble with REF LEVEL, but it can't hurt to try the 
save / reset / restore routine and see if it helps.


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/


On 10/03/2019 18:14, Dave Cole (NK7Z) wrote:

I am seeing something similar to this as well...  Not in SPAN, but in
 REF LVL.  I set REF LVL while on 30 Meters, and leave the band. 
Ssometimes when I return to 30, I need to touch the REF LVL level to

get it to return...

By touch, I mean I select REF LVL, then just turn the knob ever so 
slightly.  The P3 then reverts to where it should be...


P3 with SVGA, and power monitor.  Only on 30 meters...  Any
suggestions?

73s and thanks, Dave (NK7Z) https://www.nk7z.net Award Manager, 30MDG
Grid Awards ARRL Technical Specialist ARRL Volunteer Examiner ARRL
OOC for Oregon

On 3/10/19 8:06 AM, Victor Rosenthal 4X6GP wrote:

I had a problem in which both SPAN and CENTER changed arbitrarily
(it seemed) on band changes. I finally saved the configuration
using the P3 Utility, reset the P3 to factory parameters (power
off, hold LABELS while powering on, wait for 2 seconds, let go of
LABELS), and finally used the utility to restore the
configuration. The problem hasn't recurred -- it's been a few weeks
and it was pretty much a daily occurrence. YMMV.


73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO CWops no. 5 
http://www.qsl.net/k2vco/


On 10/03/2019 16:51, Gary J Ferdinand wrote:

Various searches dredged up nothing helpful.  I recently
developed a P3 problem.  The SPAN does not get saved.  Whenever I
change bands to a band I had set it, say, to 50 kHz, the SPAN
resets itself to 5 kHz. Sometimes I can even watch the display as
it cranks down the bandwidth.

This is a P3 *without* SVGA, but *with* TXMon.  It has 1.60
firmware installed and reloaded without effect.  It is not
directly connected to a PC. The transceiver to which it is
connected is a K3S.

P3 SPAN settings:  SpanScale: REF LEVEL ONLY, SteppedSpan:  OFF

I appreciate any pointers to where I should look.  Thanks.

73/Gary W2CS

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Re: [Elecraft] Nasty spurs on RX with new KPA500

[Gary NC3Z]

Yes Jim, everything is bonded. All 120V and 240V AC goes through ICE 
suppressors on a SPG, all shack equipment is bonded to that, etc. It's 
not a bonding issue (I have read and followed your "cook book" long 
ago). Several direct e-mails indicate it's an issue with the front panel 
board and this is not the first of this exact issue. So right now am 
just waiting for Elecraft to open back on Monday.

Gary Mitchelson
NC3Z/4 Pamlico County, NC FM15
NC AHIMT COML
SHARES NCS997
NC Deputy Auxcomm Coordinator - Statewide
www.mitchelson.org

On 3/9/2019 15:47, Jim Brown wrote:
> On 3/9/2019 3:36 AM, Gary NC3Z wrote:
>> It puts out strong spurs on 20-6M
>> with 10M being the worst.
>
> In addition to the possibility of a coax cable with a bad shield 
> connection, another thought -- is your station properly bonded? Every 
> chassis should be bonded together with short, fat copper, all 
> equipment should be powered from outlets that share the same "green 
> wire" or outlets whose green wires are bonded together. and bonds 
> between those outlets and all other grounds in your home.
>
> 73, Jim K9YC
>
>
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Re: [Elecraft] P3 SPAN Instability

[Dave Cole (NK7Z)]

I am seeing something similar to this as well...  Not in SPAN, but in 
REF LVL.  I set REF LVL while on 30 Meters, and leave the band. 
Ssometimes when I return to 30, I need to touch the REF LVL level to get 
it to return...


By touch, I mean I select REF LVL, then just turn the knob ever so 
slightly.  The P3 then reverts to where it should be...


P3 with SVGA, and power monitor.  Only on 30 meters...  Any suggestions?

73s and thanks,
Dave (NK7Z)
https://www.nk7z.net
Award Manager, 30MDG Grid Awards
ARRL Technical Specialist
ARRL Volunteer Examiner
ARRL OOC for Oregon

On 3/10/19 8:06 AM, Victor Rosenthal 4X6GP wrote:

I had a problem in which both SPAN and CENTER changed arbitrarily (it
seemed) on band changes. I finally saved the configuration using the P3
Utility, reset the P3 to factory parameters (power off, hold LABELS
while powering on, wait for 2 seconds, let go of LABELS), and finally
used the utility to restore the configuration.
The problem hasn't recurred -- it's been a few weeks and it was pretty
much a daily occurrence.
YMMV.


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/

On 10/03/2019 16:51, Gary J Ferdinand wrote:

Various searches dredged up nothing helpful.  I recently developed a
P3 problem.  The SPAN does not get saved.  Whenever I change bands to
a band I had set it, say, to 50 kHz, the SPAN resets itself to 5 kHz.
Sometimes I can even watch the display as it cranks down the
bandwidth.

This is a P3 *without* SVGA, but *with* TXMon.  It has 1.60 firmware
installed and reloaded without effect.  It is not directly connected
to a PC. The transceiver to which it is connected is a K3S.

P3 SPAN settings:  SpanScale: REF LEVEL ONLY, SteppedSpan:  OFF

I appreciate any pointers to where I should look.  Thanks.

73/Gary W2CS

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Re: [Elecraft] 80m KPA1500 High reflected power problems

[john]

And the dipole wire (especially the ends) needs to be away from branches, 
shrubs ,etc.

John KK9A


-Original Message-
From: Don Wilhelm [mailto:donw...@embarqmail.com] 
Sent: Saturday, March 09, 2019 11:07 PM
To: Peter Dougherty; j...@kk9a.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] 80m KPA1500 High reflected power problems

Peter,

If your antenna end insulators are covered with ice and snow, it is 
entirely possible that the ice/snow covering will not show conductivity 
with low power, but will become conductive at high power.  That will 
make whatever material you are using to support the antenna ends a part 
of the antenna radiator - effectively lengthening the antenna.

Shake the snow and ice from the end insulators and/or use longer end 
insulators and there is a good chance your problem will go away.

73,
Don W3FPR

On 3/9/2019 10:17 PM, Peter Dougherty wrote:
> John, I know there were some issues with my old tube amp, but it did load
> enough to get me 275-odd DXCC entities with 1500W on 80 CW. The KPA has
> never been used in the past on 80 since I was having antenna trouble (one
> end was down all winter and it just got fixed today).
> 
> Everything's snow covered out the back so I don't want to play around at the
> coax switch at the moment. I'll try bypassing the switch when it's a bit
> warmer and the snow is gone.
> 
> Of note, last year with the weird SWR, the "old antenna" (same physical
> space and height, just all different materials) was cut to 3750 and I used a
> tuner for the bottom end. I found the tuner kept giving me "unable to find a
> match" when I tried tuning with high power from my tube amp. I figured
> replacing every factor in that chain would fix the issue; the only thing
> that's the same is the antenna switch and the physical orientation of the
> wires themselves. New amp, new coax, new balun, new wire, insulators and
> even the support ropes were changed out.
> 

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[Elecraft] Fwd: P3 SPAN Instability

[Gary J Ferdinand]

> Begin forwarded message:
> 
> From: Gary J Ferdinand 
> Subject: Re: [Elecraft] P3 SPAN Instability
> Date: March 10, 2019 at 11:43:06 AM EDT
> To: Victor Rosenthal 4X6GP 
> 
> That was an excellent suggestion!  I hadn’t thought of the factory reset.  I 
> did as you suggested. So far all is well.
> 
> TU / 73
> 
> Gary W2CS
> 
> 
>> On Mar 10, 2019, at 11:06 AM, Victor Rosenthal 4X6GP  
>> wrote:
>> 
>> I had a problem in which both SPAN and CENTER changed arbitrarily (it
>> seemed) on band changes. I finally saved the configuration using the P3
>> Utility, reset the P3 to factory parameters (power off, hold LABELS
>> while powering on, wait for 2 seconds, let go of LABELS), and finally
>> used the utility to restore the configuration.
>> The problem hasn't recurred -- it's been a few weeks and it was pretty
>> much a daily occurrence.
>> YMMV.
>> 
>> 
>> 73,
>> Victor, 4X6GP
>> Rehovot, Israel
>> Formerly K2VCO
>> CWops no. 5
>> http://www.qsl.net/k2vco/
>> 
>> On 10/03/2019 16:51, Gary J Ferdinand wrote:
>>> Various searches dredged up nothing helpful.  I recently developed a
>>> P3 problem.  The SPAN does not get saved.  Whenever I change bands to
>>> a band I had set it, say, to 50 kHz, the SPAN resets itself to 5 kHz.
>>> Sometimes I can even watch the display as it cranks down the
>>> bandwidth.
>>> This is a P3 *without* SVGA, but *with* TXMon.  It has 1.60 firmware
>>> installed and reloaded without effect.  It is not directly connected
>>> to a PC. The transceiver to which it is connected is a K3S.
>>> P3 SPAN settings:  SpanScale: REF LEVEL ONLY, SteppedSpan:  OFF
>>> I appreciate any pointers to where I should look.  Thanks.
>>> 73/Gary W2CS
> 

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Re: [Elecraft] KPA/KAT500 Mystery Fail

[Ken Winterling]

Jack,

I assume the two cables you use are the RF coax cable and the PTT keying
line, correct?  The keying line should connect from the rig, then to the
KAT500, and finally the KPA500.  This allows the KAT500 to disable the
keying for the KPA500 during tuning or high SWR conditions.

It is possible that with moving the cables between the two rigs the keying
line cable has been damaged.  I have seen this before where a cable works
fine in one jack but not in another.  It is a matter of the cable being in
just the right position.  If you rotate it slightly it goes OC (Open
Circuit).

To simplify troubleshooting I would eliminate the KAT500 and plug the
keying line directly from the IC-7100 into the KPA500.  Put the amp on a
dummy load.

You said the '7100 doesn't key the KPA500.  You can check the KPA500
display for an asterisk (*) on the left side indicating that the amp is
receiving a keying signal (contact closure to ground) from the rig
('7100).  If you do not see that asterisk (*) then the amp is not  being
keyed by the rig.  Try a different cable to the rig.

If that doesn't work then try leaving the keying cable plugged into the amp
and unplugging the cable from the rig.  Touch to ground the center
conductor of the end of the cable you removed from the rig.  It should key
the amp and show the asterisk (*) in the display.  If the amp keys with the
cable grounded then it it time to look at the keying jack/circuit of the IC
-7100.

Let us know what you find.

Ken
WA2LBI





On Sun, Mar 10, 2019 at 10:28 AM  wrote:

> All,
>
> I have been using the KPA500/KAT500 combo with an IC-7300 and an IC-7100
> for
> around a year now. They are cabled and configured as per the Elecraft
> device
> manuals. The cabling is identical for the two transmitters (actually, I use
> the same 2 cables for both). All has been working properly with both radios
> until very recently. The amp and the tuner continue to behave properly with
> the 7300.



> The KAT500 continues to work perfectly with the 7100, however the
> KPA500 no longer band switches when I change bands on the 7100 and key up.
> In addition, the amplifier will not key. The 7100 still can put out full
> power with the KAT500 in line. I have not changed any setting in any of the
> 3 devices to my knowledge. It is like the KPA500 has become deaf to the
> IC-7100.
>
> After switching back and forth and looking at all device settings, I am
> baffled at this point! Is there anything in the way of rig to amplifier
> line
> signals that could inhibit band switching by the amplifier but not by the
> antenna tuner?
>
> Thanks for your thoughts.
>
> KD4IZ
>
> Jack Spitznagel
>
> FM19oo
>
>
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Re: [Elecraft] P3 SPAN Instability

[Victor Rosenthal 4X6GP]

I had a problem in which both SPAN and CENTER changed arbitrarily (it
seemed) on band changes. I finally saved the configuration using the P3
Utility, reset the P3 to factory parameters (power off, hold LABELS
while powering on, wait for 2 seconds, let go of LABELS), and finally
used the utility to restore the configuration.
The problem hasn't recurred -- it's been a few weeks and it was pretty
much a daily occurrence.
YMMV.


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/

On 10/03/2019 16:51, Gary J Ferdinand wrote:

Various searches dredged up nothing helpful.  I recently developed a
P3 problem.  The SPAN does not get saved.  Whenever I change bands to
a band I had set it, say, to 50 kHz, the SPAN resets itself to 5 kHz.
Sometimes I can even watch the display as it cranks down the
bandwidth.

This is a P3 *without* SVGA, but *with* TXMon.  It has 1.60 firmware
installed and reloaded without effect.  It is not directly connected
to a PC. The transceiver to which it is connected is a K3S.

P3 SPAN settings:  SpanScale: REF LEVEL ONLY, SteppedSpan:  OFF

I appreciate any pointers to where I should look.  Thanks.

73/Gary W2CS

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[Elecraft] P3 SPAN Instability

[Gary J Ferdinand]

Various searches dredged up nothing helpful.  I recently developed a P3 
problem.  The SPAN does not get saved.  Whenever I change bands to a band I had 
set it, say, to 50 kHz, the SPAN resets itself to 5 kHz.  Sometimes I can even 
watch the display as it cranks down the bandwidth.

This is a P3 *without* SVGA, but *with* TXMon.  It has 1.60 firmware installed 
and reloaded without effect.  It is not directly connected to a PC. The 
transceiver to which it is connected is a K3S.

P3 SPAN settings:  SpanScale: REF LEVEL ONLY, SteppedSpan:  OFF

I appreciate any pointers to where I should look.  Thanks.

73/Gary W2CS

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Re: [Elecraft] ALC control of W6PQL amp from my K3

[Wes]

Indeed.  Folks who would never think to turn off the AGC in their receivers get 
weak-kneed at the thought of AGC (ALC) being used in the transmit loop.  In 
"Fundamentals of SSB", Collins radio speaks of ALC (pp.7-10,11) without any 
negativity, and in fact calls it a form of speech compression.  As in many 
things, the devil is in the details.


I suspect most of the Elecraft faithful would also be surprised to know that 
their beloved K3s use internal ALC as well as digital power control. This is not 
perfect, I've observed overshoot, power slowly increasing to set level and low 
level power jitter*.


* You need a spectrum analyzer to see this and it's unlikely to be heard on the 
air, but it's there.


Wes  N7WS

On 3/9/2019 10:59 AM, KENT TRIMBLE wrote:

...
As a friend of mine puts it, the ALC controversy borders on being a religious 
issue.


73,

Kent  K9ZTV


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[Elecraft] KPA/KAT500 Mystery Fail

[kd4iz]

All,

 

I have been using the KPA500/KAT500 combo with an IC-7300 and an IC-7100 for
around a year now. They are cabled and configured as per the Elecraft device
manuals. The cabling is identical for the two transmitters (actually, I use
the same 2 cables for both). All has been working properly with both radios
until very recently. The amp and the tuner continue to behave properly with
the 7300. The KAT500 continues to work perfectly with the 7100, however the
KPA500 no longer band switches when I change bands on the 7100 and key up.
In addition, the amplifier will not key. The 7100 still can put out full
power with the KAT500 in line. I have not changed any setting in any of the
3 devices to my knowledge. It is like the KPA500 has become deaf to the
IC-7100.

 

After switching back and forth and looking at all device settings, I am
baffled at this point! Is there anything in the way of rig to amplifier line
signals that could inhibit band switching by the amplifier but not by the
antenna tuner?

 

Thanks for your thoughts.

 

KD4IZ

Jack Spitznagel

FM19oo

 

 

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[Elecraft] Where is the 1500 KHz. HPF in the K3/K3s

[Michael Blake via Elecraft]

I understand that a BCB HPF is necessary to protect the PIN diode switches from 
BCB (Broadcast Band) overload but I can not find it in the K3s schematics.  Can 
anyone tell me which sheet and components make up this filter.

I understand that to receive 630M you bypass the HP filter by using the RX IN 
but I am curious where it is on the schematic.

Michael Blake
k9...@mac.com 






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