Re: [Elecraft] K2: I killed my KPA100

[Don Wilhelm]

Jim,

My usual procedure when tackling a problem of that nature is to first 
isolate the problem to one component.

You have already apparently checked out the base K2.

Next, remove the top cover from the base K2 and connect the KPA100 to it 
(remove the KPA100 from the EC2 enclosure).
Put the KPA100 upside down on a box or book about 1/2 the height of the 
K2 and plug the cables into the K2.


Then test with an external wattmeter and a dummy load connected to the 
KPA100 SO-239 antenna jack.


First power the base K2 from the 2.1mm coaxial power jack.  Check at 5 
watts and at 10 watts - this checks the transmit path through the KPA100 
in QRP mode.  Use an external wattmeter and a dummy load.  Does the 
external wattmeter agree roughly with the K2 display indication and the 
power knob setting.


If you have a much higher actual power level on the external wattmeter, 
the KPA100 wattmeter diodes D16 and D17 are the first suspects - replace 
them.


If all is well so far, remove the 2.1mm power plug and power the 
assembly with the APP connector on the KPA100.  Make the same test.


After that, check the bias on the KPA100 for a 400ma rise in current 
with the K2 set to CW and in CW TEST mode.  Hold the mode button until 
TEST appears in the LCD, and the CW icon will blink.


Do a tune and check that the current rise from receive to TUNE is 400ma.

Then set the power to 50 watts and do a TUNE.  Read the actual power on 
the external wattmeter.  With a TUNE, it should be about 20 watts.


If it is greater, you have a problem with the KPA100 wattmeter - likely 
diodes D16 and D17 have been damaged and need to be replaced.


More troubleshooting is possible, but that is a good starting point.
If all goes well with those tests, then I can tell you how to check the 
KAT100 alone (without the KPA100).


73,
Don W3FPR

On 2/3/2019 10:13 PM, Jim KO5V wrote:

I tried to tune the KPA/KAT100, and the SWR went to red. I quickly exited 
'tune', checked all of the connections, and the antenna, and tried again. Same 
result, except before I could take it out of tune (it was tuning maybe 2-3 
seconds), all of the KPA/KAT100 lights went out. The K2 was fine. I took the 
amp off of the EC2 and installed it directly on the K2. When I powered on the 
the K2, using its low-current supply, the K2 came up normal, and didn't 
recognize the amp. The base K2 seems OK, and transmitted into my dummy load, 
and could hear the NGEN. When I powered it through the KPA's high-current 
supply, the K2 was dead. The base K2 again came back to life when I removed the 
KAT's power, and went back to the base K2's supply.

I measured the 12V supply when plugged into the KAT100, and I get between 1V 
and 2V - the PS must be protecting itself - it looks like there's a short...

Earlier today, I had been trying to get my computer to talk to the K2 through a logging 
program. After I built the rig, I tested my cables and the KIO2 by successfully controlling 
the K2 with 'K2 Remote', so it was working. Today, the logging software would poll the K2, and 
get no response. 'K2 Remote" couldn't see the rig either. The DB9 connector that connects 
to the KIO2 has the cables to the KPA/KAT and serial cable, and I made sure the computer's 
connector was wired correctly for interfacing a "normal" serial cable to the KIO2. 
It all worked.

I looked at the KPA schematic, and thought a diode, or something in the current sensing 
circuit might have failed. I removed Q5, and it tests just like my new spare. I lifted 
one side of D10, and it seems to test OK, but when I did the same to D9, it looked weird 
- but I don't really understand that device; In "diode" mode, I get .150V in 
one direction, open in the other. When I test it in resistance, I eventually measure 
80-90ohms in one direction (it takes a moment to settle), but it's open in the other. It 
might be OK? I hope I didn't kill U7.

I performed the resistance tests in the KPA manual, and they are nominal. Q1 
and Q2 test OK, and I think Q3 and Q4 are OK. Q3 tests differently than Q4, but 
looking at the schematic, I think what I see makes sense.

It also occurred to me that when I was trying to get the logging program to 
work, I might have caused a failure in my cables while I was hooking and 
unhooking the serial connection. That might have caused a communication problem 
that made the amp go a bit nuts.

Sorry for the long message. ANY suggestions will be greatly appreciated!

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[Elecraft] K2: I killed my KPA100

[Jim KO5V]

I tried to tune the KPA/KAT100, and the SWR went to red. I quickly exited 
'tune', checked all of the connections, and the antenna, and tried again. Same 
result, except before I could take it out of tune (it was tuning maybe 2-3 
seconds), all of the KPA/KAT100 lights went out. The K2 was fine. I took the 
amp off of the EC2 and installed it directly on the K2. When I powered on the 
the K2, using its low-current supply, the K2 came up normal, and didn't 
recognize the amp. The base K2 seems OK, and transmitted into my dummy load, 
and could hear the NGEN. When I powered it through the KPA's high-current 
supply, the K2 was dead. The base K2 again came back to life when I removed the 
KAT's power, and went back to the base K2's supply.

I measured the 12V supply when plugged into the KAT100, and I get between 1V 
and 2V - the PS must be protecting itself - it looks like there's a short...

Earlier today, I had been trying to get my computer to talk to the K2 through a 
logging program. After I built the rig, I tested my cables and the KIO2 by 
successfully controlling the K2 with 'K2 Remote', so it was working. Today, the 
logging software would poll the K2, and get no response. 'K2 Remote" couldn't 
see the rig either. The DB9 connector that connects to the KIO2 has the cables 
to the KPA/KAT and serial cable, and I made sure the computer's connector was 
wired correctly for interfacing a "normal" serial cable to the KIO2. It all 
worked.

I looked at the KPA schematic, and thought a diode, or something in the current 
sensing circuit might have failed. I removed Q5, and it tests just like my new 
spare. I lifted one side of D10, and it seems to test OK, but when I did the 
same to D9, it looked weird - but I don't really understand that device; In 
"diode" mode, I get .150V in one direction, open in the other. When I test it 
in resistance, I eventually measure 80-90ohms in one direction (it takes a 
moment to settle), but it's open in the other. It might be OK? I hope I didn't 
kill U7. 

I performed the resistance tests in the KPA manual, and they are nominal. Q1 
and Q2 test OK, and I think Q3 and Q4 are OK. Q3 tests differently than Q4, but 
looking at the schematic, I think what I see makes sense.

It also occurred to me that when I was trying to get the logging program to 
work, I might have caused a failure in my cables while I was hooking and 
unhooking the serial connection. That might have caused a communication problem 
that made the amp go a bit nuts.

Sorry for the long message. ANY suggestions will be greatly appreciated!

73, Jim KO5V

(and I was recently bragging that it was all working so well)
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[Elecraft] Elecraft net 2-3-2019

[Eric Lanzl]

We had a 38 check ins for the net today. I want to thank everyone for 
participating and dealing with some difficult propagation. Thanks to the relay 
stations for your help as well

Elecraft SSB Net 2-3-2019

WB9JNZ     Eric  IL K3    4017    Net control

NS7P  Phil  OR  K3    1826    Relaystation

WA5DSS    Bill   TX   KX3 3476    10 watts

K7BRR    Bill   AZ   K3S 10939

W7QHD  Kurt     AZ   K2/100 1538 

W7REK   Glenn  AZ  K3    2843

N7BDL Terry   AZ   K3    1803

KC6ZKT  Steven CA  IC 7300 KPA 500 3154

AD1G  Dick MA  K3    3782

W7HSG  Ralph   AZ   k3    4629

K1NW Brian    RI    K3    4974  Relay station

NC0JW   Jim  CO  KX3 1356    Relay station

N4NRW  Roger  SC   K3    1318

WW4JF   JOE TN   K3S 11177

WX7HS   Howard  OR    K3    6091

K8NU/P   Carl OH  FT 2000   Remotein Washington State

W1NGA  AL    CO  K3    5765

K4GCJ   Gerry   NC   K3    1597

WM6P Steve   GA   K3S 11453

KE5SO    Joe  CO  K3    1503

WA0BEU    Keith    CO KX3 7048

N9SRA    Steve   IL TS 480

N1JM  John    AZ   K3S 11139

W2RWA  Dick NY   K3    2603

W4DML   Doug   TN   K3    6433

K7JG   John    WA  KX3 3519

NL7V   Paul AL    IC 7610

ZL1PWD Peter   NZ   K3    139

K0FG/M  Fred AZ   IC 7000

AE6JV Bill   CA   K3    6299

AD5XM   Wallace   LA    K3    5956

K6WDE   Dave   CA   KX3 4599

WM5F Dwight  ID   KX3 8045

K0DJV    Paul CO  K2    405 10 watts

AB9V   Mike    IN    K3S 11750

AB4DH    Daryl   AL    Yaesu FT 991

 

 

 
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[Elecraft] Elecraft CW Net Report

[kevinr]

Good Evening,

    Compared to last week Fargo, North Dakota is undergoing a heat 
wave.  It's up to 0 degrees Fahrenheit :)  Iowa has dense fog and 
sauna-like temperatures in the mid 40s.  My brother in SW Wisconsin 
reported a flood just west of his barn.  His Mangalitsa and mulefoot 
pigs are fine as are the Belgians.  The chickens are staying inside 
laying eggs.  Around here the snow has started again.


   Both bands had slow QSB but forty meters had some fast flutter too.  
Propagation keeps improving week by week.  Oh what the sun can do when 
it's not set all the time.  The steady hissing noise was less too.  
Reading on spaceweather.com I find we're leaving the latest stream of 
solar wind.



  On 14049.5 kHz at 2200z:

W0CZ - Ken - ND

NO8V - John - MI

K6XK - Roy - IA

K4JPN - Steve - GA

K4TO - Dave - KY

AB9V - Mike - IN


  On 7047 kHz at z:

WM5F - Dwight - ID

K6XK - Roy - IA

W6JHB - Jim - CA

KG7V - Marv - WA

K0DTJ - Brian - CA

W0CZ - Ken - ND

KC6???


   Now it's time to see if the snow is sticking.  It has been falling 
since a few minutes into the 20 meter net.  Large flakes which were 
melting as fast as they hit.  The initial forecast was not correct.  Now 
only 2 inches are predicted.  No big deal unless you're in Portland.  
There it turns into ice so you can skate your way down main street.  
Even though I am well trained at winter driving I stay out of their 
way.  Safer that way :)


   Until next week 73,

  Kevin.  KD5ONS

-


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[Elecraft] Elecraft CW Net part one

[kevinr]

The twenty meter net went rather well.  Once I had a chance to call the 
net I was met by a solid tone which is always a good sign.  The 
tail-enders get a break.  By being a second after the solid tone I can 
get letters from your callsigns.  Signal reports all had some QSB but 
ranged from S1 to S7.  The deep freeze of last week only remains in 
Fargo, North Dakota the rest of you were much warmer.  I also got a link 
to an American tea grower.  That should be fun to follow.


    Until the 40 meter net

  73,

 Kevin.  KD5ONS


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[Elecraft] WTB KX2

[KK2L]

Greetings to All,I am looking for a KX2 in good operating and cosmetic
condition.  Let me know what you have.73MarkKK2L



-
Mark
KK2L
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Re: [Elecraft] Duty on warranty repairs

[VE3WDM]

I would again like to extend a thank you to all replied. I have for sure
learned a lot about sending a rig for repair overt the boarder. 
Thanks again for all of you who took time to reply!
73, 
Mike 
VE3WDM



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Re: [Elecraft] Purchased from a SK a K3

[Don Wilhelm]

Bill,

When you need to send it in for repair, email supp...@elecraft.com 
asking that an RSA be issued.

Explain that you bought it used.
You should also include your K3 serial number and your contact 
information in that same email.


73,
Don W3FPR

On 2/3/2019 2:13 PM, 1lasportsman 1lasportsman wrote:

Don
Where do I do that?
On February 3, 2019 at 1:09 PM Don Wilhelm > wrote:



Bill,

There is not any requirement to register it with Elecraft.

However, if you need to send the K3 for service, you will want to make
sure that serial number is updated with your contact information.

73,
Don W3FPR

On 2/3/2019 1:52 PM, Bill wrote:

Do I need to register with Elecraft a purchase of a used K3.
IF I need to please tell me where to register it at, looked on 
website and did not see where.

Thanks
Bill
WF9M

Sent from Mail for Windows 10



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Re: [Elecraft] Tx distortion

[Don Wilhelm]

Mike,

Of some concern is the heating of Q6 - but I don't think it is 
unreasonable if you can still hold your finger on it.


Hint for troubleshooting.  *IF* the problem is in the RF amplification 
chain (Q5 thru Q8) then it should appear in TUNE as well as in SSB.
I would suggest that you measure the DC voltages for Q5 thru Q8 after 
the K2 has been idle for some time, and then after some period of 
operation after which the distortion could be expected to begin.


One thing you might want to try is to measure the resistance from the Q6 
emitter to ground before distortion begins and after it starts.  It 
should be 1.5 ohms (so use a low resistance scale).  If it changes, 
consider replacing R50, but also be aware that there may be something 
causing the voltage on the base of Q6 to change as well.


If your Q6 is a 2sc5739 instead of a 2SC2166 (the 2SC5739 has a plastic 
tab instead of the metal tab on the 2SC2166), then change RF Board R46 
to 330 ohms.


73,
Don W3FPR

On 2/3/2019 1:26 AM, mustang65 wrote:

Don,

I have done some measuring on the powerstage.
dc voltage during tuning is 14,1 v
Bias Q7 is 0,652v when tuning.
U1 pin6 43mV on ssb transmitting.
I get about 10w max output (do not have a bird)

all measuring was done with a fluke 179.

Q6 gets mutch varmer then Q7,Q8 is this normal?

The strange thing that is confusing me is when the k2 has been turned of
over the night
there is almost no distorsion when I start to transmitt .
then it slowly arrives in the first couple of minutes.

73 Mike sm3xgm

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Re: [Elecraft] Purchased from a SK a K3

[1lasportsman 1lasportsman]

Don
Where do I do that?

> On February 3, 2019 at 1:09 PM Don Wilhelm  mailto:donw...@embarqmail.com > wrote:
> 
> 
> Bill,
> 
> There is not any requirement to register it with Elecraft.
> 
> However, if you need to send the K3 for service, you will want to make
> sure that serial number is updated with your contact information.
> 
> 73,
> Don W3FPR
> 
> On 2/3/2019 1:52 PM, Bill wrote:
> 
> > > Do I need to register with Elecraft a purchase of a used K3.
> > IF I need to please tell me where to register it at, looked on 
> > website and did not see where.
> > Thanks
> > Bill
> > WF9M
> > 
> > Sent from Mail for Windows 10
> > 
> > 
> > 
> > ---
> > This email has been checked for viruses by Avast antivirus software.
> > https://www.avast.com/antivirus
> > __
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> > 
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> > mailto:donw...@embarqmail.com
> > 
> > > 
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Re: [Elecraft] Purchased from a SK a K3

[Don Wilhelm]

Bill,

There is not any requirement to register it with Elecraft.

However, if you need to send the K3 for service, you will want to make 
sure that serial number is updated with your contact information.


73,
Don W3FPR

On 2/3/2019 1:52 PM, Bill wrote:

Do I need to register with Elecraft a purchase of a used K3.
IF I need to please tell me where to register it at, looked on website and did 
not see where.
Thanks
Bill
WF9M

Sent from Mail for Windows 10



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[Elecraft] Purchased from a SK a K3

[Bill]

Do I need to register with Elecraft a purchase of a used K3.
IF I need to please tell me where to register it at, looked on website and did 
not see where.
Thanks
Bill
WF9M

Sent from Mail for Windows 10



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[Elecraft] KX3/PX3 for sale

[Neil Ramhorst]

Hello All,

I have a KX3 and PX3 set for sale. There are lots of options included. A 
few options are nifty stands, side rails, from covers, heat sink, cw 
paddle, signal link USB, Side Kar, and a custom aluminum base that holds 
all of it. Unit has been back to Elecraft for calibration and alignment.


I can send a complete list and photographs.

Paid 3400.00 and will sell for 2400.00. Do not want to split up.

I'm looking to purchase a KPA500 and KAT500. If someone has one will 
consider trade.


Neil kl7jgsatgmail.com

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Re: [Elecraft] Elecraft CW Net Announcement

[Bill Johnson]

I heard nothing.  Band is flat here in NE WI.

73,
Bill
K9YEQ

https://wrj-tech.com/

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of 1lasportsman 1lasportsman
Sent: Sunday, February 3, 2019 12:29 PM
To: Phil Shepard ; RALPH TURK 
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Elecraft CW Net Announcement

Tied to check in for first time and here in Louisiana I was unable to hear 
enough to tell what was being said.
Made one call but got no response
Bill
WF9M

> On February 3, 2019 at 10:26 AM Phil Shepard  mailto:ph...@riousa.com > wrote:
> 
> 
> Sundays at 1800Z on 14.3035.
> 
> > > On Feb 3, 2019, at 6:23 AM, RALPH TURK  mailto:w7...@comcast.net > wrote:
> > 
> > What time & Freq is the Elecraft SSB net on?
> > 
> > Ralph,W7HSG
> > 
> > 
> > 520-444-6610
> > 
> > Ralph S. Turk,
> > 
> > > > > On February 2, 2019 at 10:51 PM kevinr  > mailto:kev...@coho.net > wrote:
> > > 
> > > 
> > > Good Evening,
> > > 
> > > Tomorrow we are due for a snow storm. Somewhere between six 
> > > and
> > > eight inches before it ends. Hopefully it will not effect the 
> > > power.
> > > But the chances of me losing power between nets gets higher 
> > > as the storm
> > > increases. So we'll see what happens. If I am not around for 
> > > either
> > > net you'll know why. However, you can never depend on their 
> > > predictions
> > > of snow.
> > > 
> > > The clouds have been making interesting patterns to my west. 
> > > For the
> > > last week there have been a series of mixing spirals. They 
> > > cover ten
> > > degrees of latitude or more. If you are interested you can 
> > > see them
> > > here: www.ssd.noaa.gov/goes/west/weus/vis-l.jpg
> > > 
> > > Please join us tomorrow on:
> > > 
> > > 14050 kHz at 2200z Sunday (2 PM PST Sunday)
> > > 7047 kHz at z Monday (4 PM PST Sunday)
> > > 
> > > 73,
> > > 
> > > Kevin. KD5ONS
> > > 
> > > -
> > > 
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Re: [Elecraft] Elecraft CW Net Announcement

[1lasportsman 1lasportsman]

Tied to check in for first time and here in Louisiana I was unable to hear 
enough to tell what was being said.
Made one call but got no response
Bill
WF9M

> On February 3, 2019 at 10:26 AM Phil Shepard  mailto:ph...@riousa.com > wrote:
> 
> 
> Sundays at 1800Z on 14.3035.
> 
> > > On Feb 3, 2019, at 6:23 AM, RALPH TURK  mailto:w7...@comcast.net > wrote:
> > 
> > What time & Freq is the Elecraft SSB net on?
> > 
> > Ralph,W7HSG
> > 
> > 
> > 520-444-6610
> > 
> > Ralph S. Turk,
> > 
> > > > > On February 2, 2019 at 10:51 PM kevinr  > mailto:kev...@coho.net > wrote:
> > > 
> > > 
> > > Good Evening,
> > > 
> > > Tomorrow we are due for a snow storm. Somewhere between six 
> > > and
> > > eight inches before it ends. Hopefully it will not effect the 
> > > power.
> > > But the chances of me losing power between nets gets higher 
> > > as the storm
> > > increases. So we'll see what happens. If I am not around for 
> > > either
> > > net you'll know why. However, you can never depend on their 
> > > predictions
> > > of snow.
> > > 
> > > The clouds have been making interesting patterns to my west. 
> > > For the
> > > last week there have been a series of mixing spirals. They 
> > > cover ten
> > > degrees of latitude or more. If you are interested you can 
> > > see them
> > > here: www.ssd.noaa.gov/goes/west/weus/vis-l.jpg
> > > 
> > > Please join us tomorrow on:
> > > 
> > > 14050 kHz at 2200z Sunday (2 PM PST Sunday)
> > > 7047 kHz at z Monday (4 PM PST Sunday)
> > > 
> > > 73,
> > > 
> > > Kevin. KD5ONS
> > > 
> > > -
> > > 
> > > __
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Re: [Elecraft] Tx distortion

[Don Wilhelm]

Mike,

Is there any chance you have the K60XV option in that K2?
If so, you can set split the transmit path into 2 pieces because the 
Transverter output takes its output from just after the bandpass filters 
- i.e. - it does not use the Q5, Q6, Q7 and Q8 stages.


Set up for a transverter band operation with the output in the range of 
1 mV - It should not matter which is the IF band.


Monitor the output at the Transverter output to check for distortion.
If present, the problem is in the RF Chain before it reaches the 
amplifier stages.

If it is clean there, look at the RF Chain after the bandpass filters.

73,
Don W3FPR

On 2/3/2019 1:26 AM, mustang65 wrote:

Don,

I have done some measuring on the powerstage.
dc voltage during tuning is 14,1 v
Bias Q7 is 0,652v when tuning.
U1 pin6 43mV on ssb transmitting.
I get about 10w max output (do not have a bird)

all measuring was done with a fluke 179.

Q6 gets mutch varmer then Q7,Q8 is this normal?

The strange thing that is confusing me is when the k2 has been turned of
over the night
there is almost no distorsion when I start to transmitt .
then it slowly arrives in the first couple of minutes.

73 Mike sm3xgm

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Re: [Elecraft] Elecraft CW Net Announcement

[Phil Shepard]

Sundays at 1800Z on 14.3035.

> On Feb 3, 2019, at 6:23 AM, RALPH TURK  wrote:
> 
> What time & Freq is the Elecraft  SSB net on?
> 
> Ralph,W7HSG
> 
> 
> 520-444-6610
> 
> Ralph S. Turk, 
> 
> 
>> On February 2, 2019 at 10:51 PM kevinr  wrote:
>> 
>> 
>> Good Evening,
>> 
>>Tomorrow we are due for a snow storm.  Somewhere between six and 
>> eight inches before it ends.  Hopefully it will not effect the power.  
>> But the chances of me losing power between nets gets higher as the storm 
>> increases.  So we'll see what happens.  If I am not around for either 
>> net you'll know why.  However, you can never depend on their predictions 
>> of snow.
>> 
>>The clouds have been making interesting patterns to my west. For the 
>> last week there have been a series of mixing spirals. They cover ten 
>> degrees of latitude or more.  If you are interested you can see them 
>> here: www.ssd.noaa.gov/goes/west/weus/vis-l.jpg
>> 
>> Please join us tomorrow on:
>> 
>> 14050 kHz at 2200z Sunday  (2 PM PST Sunday)
>>  7047 kHz at z Monday  (4 PM PST Sunday)
>> 
>> 73,
>> 
>>Kevin. KD5ONS
>> 
>> -
>> 
>> __
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Re: [Elecraft] Tx distortion

[George Winship, NC5G]

Maybe something in this thread will help.

http://elecraft.365791.n2.nabble.com/K2-SSB-Performance-Improvement-td7596200.html

73,
George NC5G



--
Sent from: http://elecraft.365791.n2.nabble.com/
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Re: [Elecraft] Elecraft CW Net Announcement

[RALPH TURK]

What time & Freq is the Elecraft  SSB net on?

Ralph,W7HSG


520-444-6610

Ralph S. Turk, 


> On February 2, 2019 at 10:51 PM kevinr  wrote:
> 
> 
> Good Evening,
> 
>     Tomorrow we are due for a snow storm.  Somewhere between six and 
> eight inches before it ends.  Hopefully it will not effect the power.  
> But the chances of me losing power between nets gets higher as the storm 
> increases.  So we'll see what happens.  If I am not around for either 
> net you'll know why.  However, you can never depend on their predictions 
> of snow.
> 
>     The clouds have been making interesting patterns to my west. For the 
> last week there have been a series of mixing spirals. They cover ten 
> degrees of latitude or more.  If you are interested you can see them 
> here: www.ssd.noaa.gov/goes/west/weus/vis-l.jpg
> 
> Please join us tomorrow on:
> 
> 14050 kHz at 2200z Sunday  (2 PM PST Sunday)
>   7047 kHz at z Monday  (4 PM PST Sunday)
> 
> 73,
> 
>     Kevin. KD5ONS
> 
> -
> 
> __
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Re: [Elecraft] Tx distortion

[hdv]

RVerzonden vanaf mijn Samsung Galaxy-smartphone.
--4e-- Oorspronkelijk bericht Van: Jim Brown 
 Datum: 03-02-19  14:30  (GMT+08:00) Aan: 
elecraft@mailman.qth.net Onderwerp: Re: [Elecraft] Tx distortion On 2/2/2019 
7:54 PM, Bob McGraw K4TAX wrote:> Don't forget about the length of the ground 
conductor as well. I've > seen and found more than one instance where the 
ground conductor was a > 1/4 wavelength on the band which caused RFI in the 
station.   That > puts the station at 1/4 wave or a maximum voltage point above 
ground.  > It was acting like a receiving antenna in the presence of the > 
transmitted RF.    For that reason, I do not use an external ground on > my 
station equipment.  It is not needed.There are so many things wrong in this 
short paragraph that I hardly know where to start. I strongly suggest that you 
buy and study N0AX's recent ARRL book on Grounding and Bonding. What you seem 
to be describing is also a violation of the National Electric Code. And while 
you're at it, buy and study the ARRL Antenna Book.73, Jim 
K9YC__Elecraft 
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