Re: [IRCA] Wellbrook Loop comparison

["Andrew Ikin" <andrew.ikin@xxxxxxxxxxxxx>]

Russ,

In answer to your question; the Head Amp. on both loops are identical. 
Therefore, in theory both loops will deliver the same signal to noise ratio 
when used in  a low noise environment, providing that the receiver noise 
figure is less than 10dB.

However, receivers with a less than 10dB noise figure are not very common; 
14/15dB NF receivers are more prevalent, especially with SDRs. Therefore, 
the LNP version has an 8/9dB  low noise push-pull Norton amplifier 
integrated into the Antenna Interface ( Bias Tee) to reduce the receiver NF.

The near $100.00 price difference is due to the added complexity of the 
Norton amp. and the additional time to manufacture it.

Now for the $64,000 question. Would the average listener notice any 
difference without watching the S meter. The answer is not many. However, 
too many listeners take too much notice of the S meter and may prefer a 
higher gain together with an improvement receiver AGC.

Also the LN version may be a better option with its lower gain when used in 
the service area of high power AM band Tx.

73

Andrew Ikin

Wellbrook Communications

-----Original Message----- 
From: Russ Johnson
Sent: Friday, November 10, 2017 1:16 PM
To: nrc-am@xxxxxxxxxxxxxxxx ; irca@xxxxxxxxxxxxxxxx
Subject: [IRCA] Wellbrook Loop comparison

Hi,

Wondering if anyone has used both the ALA1530LNP and ALA1530LN.

As best I can tell, the LNP is active and LN passive. About $100 difference.

Would be interested in any comments about user experience and any opinions 
on if there is significant performance difference between the two.

I have a slight bias for "simpler/less electronics" but would give that up 
for significantly better performance.

Any comments/feedback really appreciated!

Russ Johnson
Lexington NC
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