Anton,
Almost all YBs on 160m are working FT8.
Worked YB1TJ, YB2DX, YF5RFU, YB9AY, YB1BA, YB4IR.
The only CW QSO was in 2013 with YC0LOW (SK)
Good luck
>Среда, 8 января 2020, 20:17 +03:00 от Anton Moehammad via Topband
>:
>
>Hi All,
>Just wondering if any of You recently (2019) have heard any
A very effective device called *Dynaplate* works very well as a saltwater
grounding system for boats or limited areas to run full-sized radials. You
can get one for $100 from the link below.
https://www.jamestowndistributors.com/userportal/show_product.do?pid=13331
Herb, KV4FZ
On Wed, Jan 8, 202
Larry
You could always use two 10KV 1000pf in series might be easier to find
Dave
NR1DX
manu...@artekmanuals.com
On 1/8/2020 11:35 PM, Larry via Topband wrote:
does anyone know of a HV (20KV) capacitor with a value of approximately 500 pf
that has a NPO value?
thanks in advance.
larry/n7dd
__
Interesting information here:
http://www.arrl.org/files/file/Antenna%20Book%20Supplemental%20Files/22nd%20Edition/Seawater%20Grounds%20-%20by%20N6LF.pdf
Rob
K5UJ
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Larry, I understand most modern doorknobs (e.g. HEC's) at or below 170pF
are NPO. I think 3 170pF's in parallel may work if you truly need NPO.
Matching network or blocking capacitor?
Tim N3QE
On Wed, Jan 8, 2020 at 11:35 PM Larry via Topband
wrote:
> does anyone know of a HV (20KV) capacitor
Robert,
You only have to "connect" to the salt-water. Don't worry about radials or
field of radials. From you coax shield, or whatever GND (common) you have,
run as many wires as you can into the water. They do not have to be long:
you just want about 6' of wire in the water (even at low tide).
I operated on a pier over salt water on 160m in 3 locations. Once with
baloon for an inv L. KW with short antenna creates special problems. See my
message yesterday.
Short radials will have extremely high voltage at a KW level. Small metal
plate on salt water may have water sizzling or would intr
Larry,
It will be hard to find.
You can find HEC HT75 100 or 200 pF, 15 kV with -750 tempco. You could
parallel them to get 500 pF. Alternatively, there are Russian 470 pF, 15 kV,
-1500 tempco caps around.
GL and 73,
George,
AA7JV
On Thu, 9 Jan 2020 04:35:12 + (UTC)
Larry via Topband wr
Rob,
This is a good reference. Only one comment: I found recently on C6AGU that
on 160 m the 2 -3 foot tidal change cause only a small change in the SWR of
a tuned inverted L with its metal base standing in salt-water. I tuned the
antenna to resonance with an SWR of 1.2 at mid-tide. Between low
> does anyone know of a HV (20KV) capacitor with a value of approximately
500 pf that has a NPO value?
Once you get above about 100pF, NP0 options are very limited. Be mindful of
the RF current magnitude in the application. Small doorknobs can heat and
change in value. In fact, I am dealing wit
Rob,
I considered this for my MM SSB. It doesn't work. Several published
tests prove that. Ok as an AC/DC ground.
Grant
On 1/9/2020 01:18, Herbert Schoenbohm wrote:
A very effective device called *Dynaplate* works very well as a saltwater
grounding system for boats or limited areas to run
Hello Paul,
I am dealing with the same overheating problem. I need a 475 pf
capacitor to shunt feed my 160 tower. I just happened to have a 500 pf
15 KV doorknob almost the size of my fist. It did work for awhile,
(several years) but now seems to heat up and the VSWR climbs to 2:1.
The unit
You can try several paralleled doorknob caps to lower ESR, thus minimize cap
heating. In my case, one vacuum variable will replace the HEC doorknob pair.
In the alternative, an air variable in a WX-proof enclosure should work fine.
You can compute the peak voltage across the cap as well as
Well sadly conditions were rather poor last night . . .
Also I wasn't sure how many stations made it on the band, as I had
torrential rain all night, and with the 400kV power lines a mile away that
caused a high noise level, so could only copy stations above S7.
Oh well . . . perhaps it will be
"MaxGain Systems has a surplus Jennngs 500pF/20KV cap for about $350"
This is the one being used on my T and no problems at 1.5KW.
73, Ted: W1GL
--- Original message ---
Subject: Re: Topband: de n7dd
From: Paul Christensen
To: topband
Date: Thursday, 09/01/2020 10:25 AM
does anyone kno
Hello Roger,
You had a great signal last night. At one point you called CQ and I
answered with 5 watts, but you did not hear me. I did work I think two
stations while running 5 watts here. One was HA0NAR. This morning was a
big ZERO. I was up at 1000 UT and called CQ but had no QSOs and heard
Last night for me was interesting. I worked I5JVA who was a true 599 at my
QTH in eastern PA and I never hear Europe better then 579 on the best days!
Then I worked VP5/KM3T but after that - nothing! Last week the band was much
better at my QTH. Low noise and was easily working into Europe - which
Recently the geomagnetic field has been very unstable, hence a higher
K-index and a lot of aurora, resulting in totally wiped out DX
conditions on 160m up here.
None of the regular NA stations could be heard this week.
Then again, conditions were phenomenal during the Stew so let's hope
for a
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