On Mon, 13 Sep 2010 13:13:53 -1000, David Herring wrote:
>I'd like to know how one would properly bond equipment (I guess for DC and
>audio purposes) AND RF ground the same equipment at the same time.
Study my posts. That's the right way to do it, and that's why I spent the
time going through i
Hi all,
Just for the record, here is what I am doing for "grounding" and "bonding".
Outside the shack I have all coaxes coming to an entry point near a basement
window where they go through. The coax shields there are all connected to a
8' grond rod near the entry point. This ground rod is also b
Yes please do post back here the final outcome. While not strictly an Elecraft
issue, it is one of interest.
Specifically, I'd like to know how one would properly bond equipment (I guess
for DC and audio purposes) AND RF ground the same equipment at the same time.
Thanks and 73,
Dave
AH6TD
Se
Jim, Don and Joe,
To keep list traffic reasonable, let's take this recurring discussion
off list to direct email for now. Once you have all agreed please feel
free post the results to the list.
Also, there is a lot of past info on this topic that is searchable in
the list archives.
Also, pl
On Mon, 13 Sep 2010 09:40:00 -0400, Don Wilhelm wrote:
>If we were discussing RF, then your single point ground connected to a
>low impedance ground for RF would be correct - keep the path to RF
>Ground the same distance for each piece of equipment. will achieve
what
>is needed for lightning p
Joe,
For elimination of DC and AF problems, no ground is required. The real
requirement is that all equipment be at the same potential. Connecting
the chassis of all equipment together with heavy gauge wire or strapping
material will provide that low resistance path. Potential differences
On Mon, 13 Sep 2010 01:26:43 -0400, Joe Subich, W4TV wrote:
> > Let's say that you bond all equipment to your MAGIC SINGLE POINT,
> > and it takes 3 ft of wire to get there. If two pieces of equipment
> > are only three inches apart and you bond directly between them,
> > CHASSIS to CHASSIS, the w
> This is a common misconception that results from muddy thinking. It
> is the big lie, repeated over and over again until somehow everyone
> believes it. DC and low frequency currents follow Ohm's Law -- that
> is, the path with the lowest DC resistance.
And the proper low impedance ground f
original-
De: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] En nombre de Don Wilhelm
Enviado el: Domingo, 12 de Septiembre de 2010 05:38 p.m.
Para: Jim Brown
CC: elecraft@mailman.qth.net
Asunto: Re: [Elecraft] K3 RFI in transmitted audio
Jim,
Sorry about my phrasing, I
On Sun, 12 Sep 2010 15:08:34 -0400, Joe Subich, W4TV wrote:
>Bonding unit to unit ENCOURAGES common mode currents to flow
through
>all of the units in series. Bonding to a single LOW IMPEDANCE
ground
>moves the common mode and RF currents to the ground and *NOT* the
>other equipment.
This is a
Jim,
Sorry about my phrasing, I did not mean to imply that it was strange
that the varying V- current would cause modulation, it can and it will.
What I intended to say was that the modulation itself might appear
"strange", and may not be recognized as mmodulation at all.
73,
Don W3FPR
On 9
>> This is good advice ... and always bond the chassis of each piece
>> of equipment to the common ground point and not "chassis to chassis."
>
> This is the only advice that I disagree with. Low impedance bonding
> chassis to chassis of equipment that mave an unbalanced signal
> connection
On Sat, 11 Sep 2010 20:06:50 -0400, Joe Subich, W4TV wrote:
>This is good advice ... and always bond the chassis of each piece
>of equipment to the common ground point and not "chassis to chassis."
This is the only advice that I disagree with. Low impedance bonding
chassis to chassis of equipmen
Joe,
Let me rephrase your point and add a bit more.
Any accessories that are used during transmit would best be powered by a
supply different than the transceiver power supply. Strange modulation
of the V- line to the accessory can result, especially with SSB
transmission, but possible with
> This is not a good idea. Repeating W4TV's warning with a different
> choice of words
Actually, using +13.8V *from the transceiver* is not a major issue
since there is no current return via the microHAM interface (or any
other accessory device).
The big problem is with using the same supp
Hi Felipe,
>> microham is being fed from K3 12v port.
>>
This is not a good idea. Repeating W4TV's warning with a different
choice of words
The 12V at the K3 will vary up and down according to the audio current
draw, at an audio rate. This variation in the 12V will now modulate
anything els
2010/9/11 Felipe Ceglia :
> well...
>
> FT2000 is fed by its own internal PS.
>
> K3 is being fed by an alinco DM330 PS, and I have wounded a choke on a
> flyback toroid on the K3 red/black PS wire. (I havent actually checked
> its characteristics on VNA)
>
> microham is being fed from K3 12v port.
On Sat, 11 Sep 2010 13:37:49 +, Felipe Ceglia wrote:
>Here is the setup:
>rig A:
>K3
>heil proset on front panel
>pc audio on rear plugs
>cat plugged via microham microkeyer
>nothing plugged on cw key jack (that minimized rfi a bit, it was
>coming from microkeyer)
>JRC 1kw amp
>rig B
>ft2000
> When rig B TX, depending on band, it gets into K3 TX audio.
Use standard audio decoupling techniques ... use separate power
supplies for each transceiver and the microKEYER. Do not use
Mic + Line with the K3, make sure that any external power supply
does not tie V- to chassis (and/or third pi
Felipe
If you are using external speakers with built-in audio amps, they can cause
this problem. I solved the problem by turning the speaker amp volume down to
less than ΒΌ, and turning up the K3 audio to compensate.
73, Fred, AE6IC, K3 2241, P3 100
" Do or Do-not. There is no 'Try'..." ~ Yoda
Hi Jim
Here is the setup:
rig A:
K3
heil proset on front panel
pc audio on rear plugs
cat plugged via microham microkeyer
nothing plugged on cw key jack (that minimized rfi a bit, it was
coming from microkeyer)
JRC 1kw amp
rig B
ft2000
cat cable to pc
icom pw1 amp
The antennas are all near the
On Fri, 10 Sep 2010 21:35:49 -0300, Felipe Ceglia wrote:
>When second rig is TX on 80m, I get the whole audio being coupled by the K3.
Please give more detail about your problem. Are both radios transmitting at
the same time? Both K3s, or one a different radio? Is there a computer
feeding eithe
Hi,
I frequently see some RFI talkback on transmitted audio on my K3,
which serial number is on 4000's batch.
When second rig is TX on 80m, I get the whole audio being coupled by the K3.
Is this a common issue? Any tips to solve?
73
--
Felipe Ceglia - PY1NB
---
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