Re: [IRCA] Wellbrook Loop comparison

[Russ Johnson <radiok3pi@xxxxxxxxx>]

Andrew 

Thank you so much for your detailed and quick reply.  This will help me a lot in figuring out which way to go. 

73
Russ Johnson 

> On Nov 10, 2017, at 2:43 PM, Andrew Ikin <andrew.ikin@xxxxxxxxxxxxx> wrote:
> 
> 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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