Allow me to clarify my post. I was referring to the high impedance
amplifiers at the vertical elements, not the 2N5109 preamp used
sometimes post combiner.
73 Joel W5ZN
On 2020-03-01 20:27, w...@w5zn.org wrote:
As an alternative to the 2N5109 preamps, last year I acquired a set of
HiZ
On 3/1/2020 7:44 PM, Don Kirk wrote:
Hi Rick,
My first example is why NVIS can be useful. I often can't hear stations
150 miles away on 160 meters using my TX vertical, but they are booming
in on my pennant that has a much better response to higher angle signals
(I could definitely
On 3/1/2020 7:47 PM, Don Kirk wrote:
Hi Rick,
One more comment. I believe AM broadcast stations try to avoid phase
cancellation between skywave and ground wave, and therefore they try and
avoid antennas that have a high angle lobe. I'm pretty sure that's why the
AM broadcast stations that
As an alternative to the 2N5109 preamps, last year I acquired a set of
HiZ preamps to use on my YCCC 9 Circle array elements. They work
exceptionally well and exhibit a lower noise figure that I experienced
with the original YCCC amps.
I mentioned this solely for information with no other
Hi Rick,
My first example is why NVIS can be useful. I often can't hear stations
150 miles away on 160 meters using my TX vertical, but they are booming in
on my pennant that has a much better response to higher angle signals (I
could definitely generate more points in a 160 meter contest if I
Good info Lee...thanks for the support!
Cecil
K5DL
Sent from my iPad
> On Mar 1, 2020, at 9:36 PM, Lee STRAHAN wrote:
>
> Hi Guys,
> I got advance information of the 2N5109 and its cousin the 2N3866
> transistors demise. I used the 2N3866 in my older design Hi-Z 75 ohm preamp
> so
Hi Guys,
I got advance information of the 2N5109 and its cousin the 2N3866
transistors demise. I used the 2N3866 in my older design Hi-Z 75 ohm preamp so
this transistor should suffice in most preamps that used the the 2N5109 . I
bought a good supply of the 2N3866 devices and can offer
On 3/1/2020 6:47 PM, Don Kirk wrote:
Hi Rick,
One more comment. I believe AM broadcast stations try to avoid phase
cancellation between skywave and ground wave, and therefore they try and
avoid antennas that have a high angle lobe. I'm pretty sure that's why
the AM broadcast stations
So did I! Ordered ten a few minutes ago.
Good thing this discussion came up, as the TRW LT1001A CATV transistor in
my station's W7IUV preamp has long been unobtainium. (I got a few from W8JI
over 40 years ago, and this is the only one I have left!)
I could have sworn that I had some new 2N5109s
Hi Rick,
One more comment. I believe AM broadcast stations try to avoid phase
cancellation between skywave and ground wave, and therefore they try and
avoid antennas that have a high angle lobe. I'm pretty sure that's why the
AM broadcast stations that tried such things as a 5/8 wave length
Hi Rick,
I use a 68 foot base loaded vertical on 160 meters, but I also use 3
different pennant RX antennas. Unless it's ground wave, my 160 meter TX
vertical is often deaf for stations in adjacent states that are in close to
me (say 100 to 200 miles away). Sometimes I can barely hear these
On 3/1/2020 5:26 PM, Mike Waters wrote:
However, during stateside contests such as the ARRL 160, not having some
NVIS would be a disadvantage.
Optimum height for NVIS on 160 is about 110 ft.
73, Jim K9YC
_
Searchable Archives: http://www.contesting.com/_topband - Topband
On 3/1/2020 5:26 PM, Mike Waters wrote:
However, during stateside contests such as the ARRL 160, not having some
NVIS would be a disadvantage.
73, Mike
W0BTU
How come AM broadcast stations don't need NVIS?
Rick N6RK
_
Searchable Archives: http://www.contesting.com/_topband -
On 3/1/2020 5:21 PM, K9FD wrote:
I bought a supply from Mouser a month or two ago, they had some on
order, probably all gone
by now as the word gets around.
73 Merv K9FD
I just ordered some from Mouser; "March 30" ship date.
Over 4000 were supposedly available. Get 'em while you can!
Hi Ed,
I forget what I said, but I am in full agreement with this. :-)
However, during stateside contests such as the ARRL 160, not having some
NVIS would be a disadvantage.
73, Mike
W0BTU
On Sat, Feb 29, 2020, 11:38 AM Ed Sawyer wrote:
> Mike, I am not sure where you find your information,
Many of those Chinese ones are plain junk, if you measure them they re
no where close to a
good 5109. They just silk screen the number on the top of "generic"
parts.
If you use them test them before putting them in use, will save a lot
of trouble shooting time.
I bought a supply from
I see they're all from China. Perhaps from Wuhan? ; -)
73, Mike
W0BTU
On Sun, Mar 1, 2020, 6:30 PM wrote:
> There's no shortage of 2N5109s on eBay for about one dollar each
>
>
> www.ebay.com/sch/i.html?_from=R40&_nkw=2n5109&_sacat=0&_sop=15
>
>
> 73
> Frank
> W3LPL
>
> - Original Message
Mouser is going to have over 4600 Central Semiconductor 2N5109 BJTs at the
end of this month. :-)
https://www.mouser.com/ProductDetail/Central-Semiconductor/2N5109?qs=sGAEpiMZZMshyDBzk1%2FWiw99kSkYzPxmkl%252BSQJuBJrk%3D
73, Mike
W0BTU
On Sun, Mar 1, 2020, 5:55 PM Larry wrote:
> RE: 2N5109
One advantage of using Ebay is their excellent refund policies if
you get cheated. I've used it many times and never suffered a loss.
But you have only two weeks to file a claim.
73
Frank
W3LPL
- Original Message -
From: "Richard (Rick) Karlquist"
To: donov...@starpower.net,
On 3/1/2020 4:30 PM, donov...@starpower.net wrote:
There's no shortage of 2N5109s on eBay for about one dollar each
www.ebay.com/sch/i.html?_from=R40&_nkw=2n5109&_sacat=0&_sop=15
73
Frank
W3LPL
Considering that Motorola ceased production in the year 2000,
most of these are obviously
Beware of ebay 5109's. Most, if not all, from Chinese vendors are
counterfeit. They usually don't work well, if at all, in place of a real
5109.
Larry - W7IUV
On 3/1/2020 4:30 PM, donov...@starpower.net wrote:
There's no shortage of 2N5109s on eBay for about one dollar each
There's no shortage of 2N5109s on eBay for about one dollar each
www.ebay.com/sch/i.html?_from=R40&_nkw=2n5109&_sacat=0&_sop=15
73
Frank
W3LPL
- Original Message -
From: "VE6WZ_Steve"
To: "Richard (Rick) Karlquist"
Cc: "Topband"
Sent: Sunday, March 1, 2020 11:56:39 PM
Hi Rick,
Yes, the 2N5109s are almost un-obtainium now, but a few months ago Mouser
stocked them and maybe DigiKey, but now they are out-of-stock. Even the 2N3866
substitute is hard to find.
Over the years (2 decades) I have built at least 10 of these amps, and still
have a supply of a dozen
RE: 2N5109 replacement
With my supply of 2N5109's getting low, I looked long and hard at
suitable replacement parts.
There just isn't anything made in a leaded package that's worth while.
I did find a rather generic power transistor in a "large" SMD package
that works quite well in my
On 3/1/2020 3:31 PM, Richard (Rick) Karlquist wrote:
Now I know why you work stuff I can't even hear :-)
I'm super impressed with the great station that Steve has built. Lots of
great stuff on his website about the station and how he built it. It's
an example of great systems engineering and
On 3/1/2020 2:22 PM, VE6WZ_Steve wrote:
Just like some guys enjoy woodworking and making furniture that they may not
really need, I like to build radio things just for the fun of the project even
though I may not really “need” it. For three years I have been using the
original 9 circle RX
On 2/27/2020 8:23 PM, donov...@starpower.net wrote:
Your conclusions based on your modelling are completely consistent
with my practical experience and modelling.
My experience with building what I model or modeling what I've built has
been that if I've built the model to accurately represent
I would prefer to have the horizontal radiation canceled by using an inverted
T, but I haven't discovered a workable configuration to achieve that.
Therefore I use an inverted L with a vertical leg of 86', the most I can get.
I have no serious limitations on the length of the horizontal leg
Just like some guys enjoy woodworking and making furniture that they may not
really need, I like to build radio things just for the fun of the project even
though I may not really “need” it. For three years I have been using the
original 9 circle RX array kit that I bought from DX-engineering,
Hi All,
What if I use 2x flat tops instead of one spaced evenly?
If I recall correctly this config has 60% of length of the single one.
Does this solve the degradation effect?
73!
Csaba HA3LN / HG3N
On 2020-02-28 5:23, donov...@starpower.net wrote:
Hi Ed,
Your conclusions based on your
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