Hi Dick . . .
Good to see you on the reflector again.
One "earthly reason" for having four people wear headphones during FD is
when you are wanting to train new operators. By monitoring both sides
of the contact they can better grasp what's going on and practice
copying the exchanges (especi
On 1/16/2019 4:49 AM, K9MA wrote:
I had to add isolation transformers for the same reason the K3 has
them on the line outputs.
If you had to add isolation transformers, your station is not properly
bonded. There is NO good reason for needing transformers if all the
equipment in a station is
There's no mystery at all. The headphone outputs of two radios go to a
switching system with a common ground. There inevitably is a small AC
voltage difference between the chassis of the two radios, and from the
radios to the rest of the system ground, which results in some current
flowing in t
Like Walter, I use the Behringer HA-400 with my K3 on Field Day. You can have
up to four individuals on headphones (no earthly idea why you would have four),
and each can control the volume to their headsets. If you have visitors and
want to use the speaker too, that can be done in the menu s
I agree but in the case of using two radios, two pair of headphones, a
switching system and getting hum indicates a serious deficiency in the
station interconnection and ground scheme. Everything should be at the
same potential, thus no current would flow. As they say "sum-tin not
right".
7
Haven’t noticed any. It is a simple device, a quad op-amp and four pots in a
little metal box. It runs off 12 V, so it can plug into the shack supply.
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
> On Jan 16, 2019, at 8:14 AM, K9MA wrote:
>
> On 1/16/2019 10:0
On 1/16/2019 10:00, Walter Underwood wrote:
When I need to drive two sets of headphones, I use a $25 Behringer HA400
headphone distribution amp.
https://www.amazon.com/Behringer-HA400-Ultra-Compact-4-Channel-Headphone/dp/B000KIPT30
Any trouble with RFI?
73,
Scott K9MA
--
Scott K9MA
k...@
When I need to drive two sets of headphones, I use a $25 Behringer HA400
headphone distribution amp.
https://www.amazon.com/Behringer-HA400-Ultra-Compact-4-Channel-Headphone/dp/B000KIPT30
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
> On Jan 16, 2019, at 7:36 A
The K3/K3S Line Out already has isolation transformers internal to the
K3. I do not understand any need to put additional transformers in the
audio path(s).
What happens if you cable to LINE OUT signals to a computer soundcard
(with both left and right channels - some only are one channel if
The headphone outputs from my radios are switched with some relays. The
switching system has a common ground, which creates a ground loop,
resulting in 60 Hz hum in the headphones. (Call it common impedance
coupling, if you prefer.) I should have isolated the headphone grounds,
but a path of le
I see no need for isolation transformers with headphones. Likely the
transformers is the reason the HP output won't drive a pair of
headphones. Isolation transformers? Are they 3 winding hybrid
transformers? I've used them in professional audio installations but
they are rare and expensi
My station has a relay system for switching the headphones between two
different radios, among other things. I had to add isolation
transformers for the same reason the K3 has them on the line outputs.
The loss in the transformers reduces the audio level too much for the
rear panel headphone ja
Thanks Don.
WAARC has been doing just that for about 8 or nine years. Works great. But some
folks just want to make it hard.
Sent from my iPhone
...nr4c. bill
> On Jan 16, 2019, at 12:38 AM, Don Wilhelm wrote:
>
> Last Field Day, my K3 was used at the CW station. Two sets of headphones.
Last Field Day, my K3 was used at the CW station. Two sets of
headphones. One for the operator and one for the logger.
One was plugged into the rear panel Phones jack and the other was
plugged into the front panel jack. No problem, no splitter.
Ok, if there were folks nearby who wanted to list
I found that the level at headphone output, at least the rear panel one,
was too low to drive two pairs of headphones in parallel in my setup,
which includes some isolation transformers. The speaker output works
fine with the headphones. (Don't try this with super sensitive low
impedance headph
Do you have a sub-receiver?
Without it, I don’t think you have any signal to hear.
Why use Line Out for speakers. There is a perfectly good jack marked Speakers
right next to the Phones jack. Be sure and use a Stereo plug but it is for
wait for it. Speakers!
Sent from my iPhone
...
yes
On Tue, Jan 15, 2019 at 9:05 PM Charles Jack Hawley
wrote:
> Config-Spkrs set to 2?
>
> Chuck Jack
> KE9UW
>
> Sent from my iPhone, cjack
>
> > On Jan 15, 2019, at 7:01 PM, Dave Sublette wrote:
> >
> > My K3s arrived over the weekend and I have been setting it up. I am using
> > the rear A
My K3s arrived over the weekend and I have been setting it up. I am using
the rear Audio jacks to drive either headphones, or the Line out to drive
an amplifier and two speakers in the stereo mode.
The headphone jack has stereo output ok. But the line out only has right
channel audio. Left chann
18 matches
Mail list logo
