Palstar LA-1K Pure Signal Jack

NI0Z
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Palstar LA-1K Pure Signal Jack

Postby NI0Z » Thu May 06, 2021 1:35 pm

Hello,

I recently just received my Palstar LA-1K and noticed it has a Pure Signal Jack on back, anyone using it and how would it connect to the Anan 7000 MKII Black?

PureSignal Amp.png
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K1LSB
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Re: Palstar LA-1K Pure Signal Jack

Postby K1LSB » Thu May 06, 2021 2:41 pm

If it were me I'd just run a cable between that jack and the Rx Bypass jack on the Anan.

It'd need to be a custom cable, with a BNC connector on one end and an RCA plug on the other end.

But that's just me.. :)

Mark

EDIT: Here's a review by W1TR@arrl.net on that amp, it mentions the PureSignal feature: https://static.dxengineering.com/global ... -1k_zz.pdf
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w-u-2-o
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Re: Palstar LA-1K Pure Signal Jack

Postby w-u-2-o » Thu May 06, 2021 4:17 pm

Mark is correct, of course.

You need to set the "Bypass on TX" option in the settings so that the radio uses the external feedback signal instead of one from the internal coupler.
NI0Z
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Re: Palstar LA-1K Pure Signal Jack

Postby NI0Z » Mon May 10, 2021 2:15 am

Ok, got that, but will it also correct the Amps output as well as the Anans? I am guessing no, of course PureSignal still gives a cleaner signal to the am to work with. That being said I am guessing with the newer Anans it's not needed?
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w-u-2-o
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Re: Palstar LA-1K Pure Signal Jack

Postby w-u-2-o » Mon May 10, 2021 11:44 am

NI0Z wrote:Ok, got that, but will it also correct the Amps output as well as the Anans?
Yes, that's the entire point of using a feedback signal coupled off of the amp output. PureSignal will make the necessary corrections in order to achieve linearity at the point where the feedback signal is coupled from, in this case the output of the external amplifier.

Think about it mathematically: PS knows the shape of the input signal. PS is measuring the output, in this case at the output of the external amp. It does the math to make the output look like the input.

That being said I am guessing with the newer Anans it's not needed?
That's definitely not true. Without PureSignal the linearity of all ANAN models, newer ones included, is not significantly different or better than any other amateur radio transceiver. And, as a group, non-linearized amateur radio transmitter linearity is pretty poor, with IMD products in the -30 to -40dBc range. That's why PureSignal is so awesome. It can take that mess and reduce IMD products down to about -60dBc.
NI0Z
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Re: Palstar LA-1K Pure Signal Jack

Postby NI0Z » Tue May 11, 2021 5:48 pm

Thanks!
46flatlander
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Re: Palstar LA-1K Pure Signal Jack

Postby 46flatlander » Tue Jun 15, 2021 12:32 pm

K1LSB wrote:If it were me I'd just run a cable between that jack and the Rx Bypass jack on the Anan.

It'd need to be a custom cable, with a BNC connector on one end and an RCA plug on the other end.

But that's just me.. :)

Mark

EDIT: Here's a review by W1TR@arrl.net on that amp, it mentions the PureSignal feature: https://static.dxengineering.com/global ... -1k_zz.pdf


Can I assume the cable mentioned is the only hardware needed to connect my 8000 to
my LA-1K ? Thank you
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w-u-2-o
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Re: Palstar LA-1K Pure Signal Jack

Postby w-u-2-o » Tue Jun 15, 2021 1:37 pm

You mean besides a main RF cable and PTT cable? Yes.
46flatlander
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Re: Palstar LA-1K Pure Signal Jack

Postby 46flatlander » Tue Jun 15, 2021 7:28 pm

Thanks Scott!
46flatlander
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Re: Palstar LA-1K Pure Signal Jack

Postby 46flatlander » Wed Jun 16, 2021 1:11 pm

Which terminal on rear of 8000 corresponds to the" RX Bypass Output" mentioned on earlier Anans (PS Input) ?
Trying to connect to Palstar LA-1K Pure Signal input. Thank You
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w-u-2-o
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Re: Palstar LA-1K Pure Signal Jack

Postby w-u-2-o » Wed Jun 16, 2021 2:25 pm

On the 8000 you remove the coax jumper on the PS connectors and apply the external coupler signal to the PS Input connector.

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