Topband: Sanity Check on K9AY Loop Sensitivity

[Joel Gray]

I was able to find the specs on the Array Solutions control box.  Yes there
is a bandpass filter when the preamp is switched on .
This is copied from the documentation:
Preamplifier: 15 dB gain, feedback type, using a silicon NPN transistor
Filter passband: ±2 dB from 1.80 to 4.5 MHz
Filter stopband: –55 dB at 7 MHz, –50 dB below 1450 kHz (typical)

I'm not sure if this is the control box you are using, but thought it may
be helpful.

73, Joel
N9LQ



On Mon, Dec 12, 2022 at 9:29 AM Joel Gray <joelgray77 at gmail.com> wrote:

> Hi Pete,
> If you are using the blue Array Solutions control box, it is my
> recollection that when you switch on the preamp, it also adds a BCB filter
> to the signal path.
> 73, Joel
> N9LQ
>
>
> On Mon, Dec 12, 2022 at 9:11 AM Frank W3LPL <donovanf at starpower.net>
> wrote:
>
>> Hi Pete,
>>
>> Any preamp that has loss definitely needs repair.  Preamps are simple
>> devices that are easy to troubleshoot, the transistor is a likely
>> culprit
>>
>> 73
>> Frank
>> W3LPL
>>
>> ----- Original Message -----
>> From: "Pete N4ZR N4ZR" <pete.n4zr at gmail.com>
>> To: "topband" <Topband at contesting.com>
>> Sent: Monday, December 12, 2022 2:59:09 PM
>> Subject: 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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>