Tx Mon

[Bob DeHaney]

I have a P3 with the TX Mon option.  I have an LP100A sensor in my feedline.
Should the Tx Mon sensor be installed before or after the LP100A sensor, or
it doesn't matter?

Vy 73 de Bob DJ0RD/WU5T

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[Don Wilhelm]

Bob,

It does not matter - RF will flow through one and then the other.
Depending on how much coax you have between them, you will see some
difference in SWR unless the feedline is perfectly flat.

73,
Don W3FPR

On 6/21/2018 2:43 AM, Bob DeHaney wrote:
> I have a P3 with the TX Mon option.  I have an LP100A sensor in my feedline.
> Should the Tx Mon sensor be installed before or after the LP100A sensor, or
> it doesn't matter?
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[Jack Brindle-2]

Also remember that each box you insert into the line will cause impedance bumps and thus each will see slightly different loads. Thus the forward and reflected power readings may not perfectly match. In some cases the variance (usually as seen in SWR) can be striking.

Jack, W6FB

> On Jun 21, 2018, at 6:14 AM, Don Wilhelm <[hidden email]> wrote:
>
> Bob,
>
> It does not matter - RF will flow through one and then the other.
> Depending on how much coax you have between them, you will see some difference in SWR unless the feedline is perfectly flat.
>
> 73,
> Don W3FPR
>
> On 6/21/2018 2:43 AM, Bob DeHaney wrote:
>> I have a P3 with the TX Mon option.  I have an LP100A sensor in my feedline.
>> Should the Tx Mon sensor be installed before or after the LP100A sensor, or
>> it doesn't matter?
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[Jim Brown-10]

On 6/21/2018 6:56 AM, Jack Brindle wrote:
> Also remember that each box you insert into the line will cause impedance bumps and thus each will see slightly different loads. Thus the forward and reflected power readings may not perfectly match. In some cases the variance (usually as seen in SWR) can be striking.

That depends on the quality of the box. I have an LP100A with two
sensors, one on the output of each of the two transmitters in my SO2R
station, and I find it to be a very high quality unit, and I suspect
that the Elecraft product is too. But he TXMon option for the P3
duplicates that function. The question I would ask is why you want both
devices in line?

73, Jim K9YC

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