Topband: Slightly OT - amplifier noise

[Michael Tope]

Steve,

Couple of questions to rule out gain distribution issues:

1) On the sense antenna input do you have the pre-amp turned on or off?
2) Is your sense antenna intrinsically inefficient like a beverage or 
K9AY loop or is it something efficient like a tribander up reasonably high?
3) Is your sense antenna intrinsically efficient when you include the 
feed line loss (I assume the feedline loss on your main TX antenna is 
very low)?

73, Mike W4EF............

On 3/14/2020 9:40 AM, n2icarrl at gmail.com wrote:
> This discussion of Hi Z amplifiers has been quite interesting. 
> Excellent information from W1FV and K7TJR.
>
> I have an RX amp question, related but slightly off-topic.
>
> I have an MFJ-1025/1026 noise canceler. I like to use it on the higher 
> HF bands to cancel power line QRN. The noise is typically S3-S4, but I 
> want it down to S0 to hear the bottom layer of stations. My sense 
> antenna works fine, and the QRN is canceled. However, the MFJ-1025 
> amplifier noise is quite significant, often negating the QRN 
> cancellation. The MFJ amplifiers are J310's. Any recommendations for 
> something quieter ?
>
> 73,
> Steve, N2IC
>
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