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ramdor / Thetis

The main working repo for changes to Thetis for the Apache Labs line of radios. Find us here : https://discord.gg/6fHCRKnDc9
https://discord.gg/6fHCRKnDc9
GNU General Public License v2.0
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Link "xPA" and "Rx Bypass on Tx" for better PureSignal feedback. #396

Closed rfengrs closed 3 months ago

rfengrs commented 7 months ago

When running PureSignal from an external monitoring point with additional attenuation (50+ dB for an external power amplifier) without the xPA Engaged, the pure signal feedback is too low and becomes unstable without "unclicking" "Rx Bypass on Tx".

It would be nice to link the "xPA" option, and "Rx Bypass on Tx" to a NOT condition for normal feedback monitoring of the transmitter driver without an external power amplifier engaged..

It would be nice to provide a setup option to switch feedback sources from Internal to External when "xPA" is engaged.

Describe alternatives you've considered The only alternative may be to design a hardware solution to my external power amplifier.

Additional context I am part of the 80M 3630 group. We have a lot of hardware, SSPA, and Anan / Thetis experience. Thank you. Michael Martin - W9AAM

RdWing commented 7 months ago

xPA has nothing to do with PureSignal. xPA is a software selectable button to control open collector outputs. If your external sampler has a coupling factor of 50 dB, that should still be appropriate for barefoot operation without issue.

Please verify if your sampler is returning -50dBc or not when in barefoot mode.

rfengrs commented 7 months ago

The External Sampler is >-55dB and is within the amplifier and inline when the amplifier is being keyed and provides "15" in the ATT box being keyed by "xPA". When running Barefoot the ATT Box is at "0" and Pure Signal is short Feedback. it is necessary to go back to internal feedback in the 7000 for Pure Signal to be effective barefoot. I can continue to deal with it and perhaps remove some of the external pad and see if I can get enough to make Pure Signal happy. I just don't want to smoke the radio pads. I built the amplifier so I can come up with something...

Thank you for the great software for our Anan Radios. Michael - W9AAM

On Mon, Jan 22, 2024 at 2:05 PM J. Chang @.***> wrote:

xPA has nothing to do with PureSignal. xPA is a software selectable button to control open collector outputs. If your external sampler has a coupling factor of 50 dB, that should still be appropriate for barefoot operation without issue.

Please verify if your sampler is returning -50dBc or not when in barefoot mode.

— Reply to this email directly, view it on GitHub https://github.com/ramdor/Thetis/issues/396#issuecomment-1904720522, or unsubscribe https://github.com/notifications/unsubscribe-auth/AHMNN3I5ON3YN5EBGOWK2RLYP3BARAVCNFSM6AAAAABCEX6YFWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSMBUG4ZDANJSGI . You are receiving this because you authored the thread.Message ID: @.***>

RdWing commented 7 months ago

Michael, It sounds like the external sampler is not being engaged when in barefoot mode. A -55 dBc sampler should work without issue at 100W power level.

So I suggest this is not a Thetis issue nor is something that should be fixed via a Thetis configuration option.

rfengrs commented 7 months ago

I run about 20W Drive barefoot, thus part of the rub....

M

On Fri, Jan 26, 2024 at 2:25 PM J. Chang @.***> wrote:

Michael, It sounds like the external sampler is not being engaged when in barefoot mode. A -55 dBc sampler should work without issue at 100W power level.

— Reply to this email directly, view it on GitHub https://github.com/ramdor/Thetis/issues/396#issuecomment-1912651592, or unsubscribe https://github.com/notifications/unsubscribe-auth/AHMNN3IBIELM4SC37XA267DYQQGKJAVCNFSM6AAAAABCEX6YFWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSMJSGY2TCNJZGI . You are receiving this because you authored the thread.Message ID: @.***>

RdWing commented 7 months ago

20w barefoot works fine here with an external -55 dB sampler, with a auto puresignal value of 4. Again, it sounds like your external sampler is returning 0 signal when your amp is in standby.

rfengrs commented 7 months ago

I will review my schematic again, and remove some of the additional fixed pad. M

On Fri, Jan 26, 2024 at 2:37 PM J. Chang @.***> wrote:

20w barefoot works fine here with an external -55 dB sampler, with a auto puresignal value of 4. Again, it sounds like your external sampler is returning 0 signal when your amp is in standby.

— Reply to this email directly, view it on GitHub https://github.com/ramdor/Thetis/issues/396#issuecomment-1912664916, or unsubscribe https://github.com/notifications/unsubscribe-auth/AHMNN3ISOKHO676PHPUFGBDYQQHYVAVCNFSM6AAAAABCEX6YFWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSMJSGY3DIOJRGY . You are receiving this because you authored the thread.Message ID: @.***>

RdWing commented 7 months ago

Here's a S21 sweep of the sampler here. This level should work fine even for a 2kw pa. Picture1

rfengrs commented 7 months ago

I will take out some of the additional amplifier pad and let the ATT Pad deal with it. Thank you for a great SW Package.

Michael - W9AAM

On Fri, Jan 26, 2024 at 2:35 PM Michael W9AAM @.***> wrote:

I run about 20W Drive barefoot, thus part of the rub....

M

On Fri, Jan 26, 2024 at 2:25 PM J. Chang @.***> wrote:

Michael, It sounds like the external sampler is not being engaged when in barefoot mode. A -55 dBc sampler should work without issue at 100W power level.

— Reply to this email directly, view it on GitHub https://github.com/ramdor/Thetis/issues/396#issuecomment-1912651592, or unsubscribe https://github.com/notifications/unsubscribe-auth/AHMNN3IBIELM4SC37XA267DYQQGKJAVCNFSM6AAAAABCEX6YFWVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSMJSGY2TCNJZGI . You are receiving this because you authored the thread.Message ID: @.***>

ramdor commented 3 months ago

thanks for the support on this issue @RdWing . I will close this.

rfengrs commented 3 months ago

Richie: I have since relocated my Internal Brune Bridge Coupler from the Amplifier Pallet Output to the Antenna Side of the Antenna Relay to be able to sample both barefoot and amplified output. The Auto ATT is dealing with things fine now. Running 2.10.3.6 dev_3 as we speak.

Thank you for the great SW. Michael - W9AAM

On Sun, Jun 9, 2024 at 1:28 PM Richie @.***> wrote:

thanks for the support on this issue @RdWing https://github.com/RdWing . I will close this.

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