Didn't I see something about "protectors" built into the K3S antenna
connectors? Are they like the transient discharge tubes that protect
(somewhat) against lightning? Is there also one on the RX antenna input?
Don K2BIO
On 03/04/2017 06:05 PM, Jim Brown wrote:
Fabio,
You've seen my antenna farm -- Beverages run within 20-30 ft of my
160M TX antenna facing NE. Beverages feed a DX Eng preamp before going
the sub-RX. I don't do anything special to protect the radio, but it
does occasionally protect itself. I also use the Beverages on 80, 40,
and 30M, but TX antennas are much farther away (more than 100 ft).
This is at 1.5 kW with a Ten Tec tube amp.
BTW -- I just added a pair of VE3DO loops tuned for 160M and aimed to
EU. Each loop is a rectangle 40 ft long and 10 ft vertical, with the
bottom wire 2 ft off the ground and fed at the center. Details on
OK1RR's website. The two loops are spaced 5/8 wavelength (350 ft). You
probably don't have room for two loops, but you might fit one of them.
73, Jim K9YC
On Sat,3/4/2017 2:11 PM, Fabio IZ4AFW / NZ1W wrote:
Hi Dave,
thanks for the suggestion.
I tried doing a quick measure using a cross-needle SWR meter today,
using the lowest setting.
On 40m the power appears to just deflect the needle, well below the 0.5W
mark. Probably I could say less than 250mW, maybe 100mW.
I usually have an external relay in a box to disconnect the RX antennas
while transmitting, but not today.
I was thinking why the RX antennas remain connected when transmitting if
there's not another use in a typical single-op station.
Thanks,
Ciao
Fabio
IZ4AFW / IO4W / NZ1W
Il 04.03.2017 13:12, David Olean ha scritto:
Hello Fabio
I have two beverages that are somewhat close to my TX antenna.
One
had about 75 mw on it during TX while beverage #2 had about 1 watt!
This
is enough power to cause damage to preamps, so I made two power
limiters
and now the inputs are clipped at about 0 dBm. All it took was two
transformers and two diodes in a box. Do you know what the power level
is on your beverage during transmit periods? Really high power levels
could burn up the transformers. Disconnecting the antenna is a good
idea too.
Dave K1WHS
On 3/4/2017 9:53 AM, Fabio IZ4AFW / NZ1W wrote:
Hi guys,
I was thinking of a possible firmware improvement related to the
carrier operated relay.
I use my radio on a small lot and recently I added a short beverage
antenna for low-bands receiving. My main activity is single-op
contesting.
Because of the interaction between the tx antennas and the
beverage, on
some bands I have the COR (carrier operated relay) activating when
I use
high power.
I know the good solutions, but my point is different.
As I have the COR activating only when the RX Ant input is
selected, why
doesn't the K3 firmware disable it when pushing the ptt?
In fact, when I push the ptt I don't need the RX-ant part to be
active,
as I'm transmitting, and -at least in my setup- I have no other
rigs/devices that need that input (I mean, no in-band receivers and so
on).
Instead of using external relays (ptt-activated) that cut out the rx
input when I am transmitting, why the K3 firmware just doesn't disable
the RX ant input on its own (and re-enables it if needed when
releasing
the ptt)?
Maybe I'm missing something here, or that could be a nice improvement
for a next firmware release.
Thanks for any comment,
Ciao 73
Fabio
IZ4AFW / IO4W / NZ1W
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