Hi Pete,
I also had problems with broadcast stations at my 4 EL bidirectional
(330°/150°) broadside K9AY arrays 84 meters apart uses three 0° hybrid
combiners.
The problem was solved by a Hi-Z amplifiers with operational IO AD8855ANZ
according to Steve VE6NZ in each of the K9AY Loop.
I don't use any impedance transformers anymore. The amplifiers are connected
directly to the K9AY antenna loops through a small capacitor.
Karel OK1CF
-----Původní zpráva-----
Od: Topband za uživatele Pete Smith N4ZR
Odesláno: pondělí 12. prosince 2022 15:59
Komu: topband reflector <Topband@contesting.com>
Předmět: Topband: Sanity Check on K9AY Loop Sensitivity
I just deployed my K9AY loop (yes, I know I'm late). Anyhow, while it shows
substantial directivity on broadcast stations, I was surprise by how much the
K9AY loop's sensitivity suffers compared to my inverted L.
Listening to a broadcast station with the K9AY on 1500 KHz, the station is S6-7
in the right direction and S3 in the reverse. and S9 +10 on the inverted L.
There's also something haywire in the K9AY's preamp, which
*reduces* signal by a couple of S-Units. Could be I need to replace the
transistor?
--
73, Pete N4ZR
One of the RBN team
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