Topband: Sanity Check on K9AY Loop Sensitivity

[ok1cf at atlas.cz]

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 at 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

_________________

Searchable Archives:  <http://www.contesting.com/_topband> http://www.contesting.com/_topband - Topband Reflector