For those following the EdenDSP project (see [email protected] ), I have ordered a stock of V3.0 boards and they should arrive next week.? I should have 25 available then.

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Oliver and I have also added a new kit to our list… It’s an Amplifier Driver board.? You can use it to drive any external amplifier up to 250V and 6A? either closed contacts or open contacts for amp key…. And can be set up for positive going signal or negative going signal on input for trigger.? ?Input voltage can be pretty much anything from 1.8V to 100V.?

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We designed this because both the 20W PA and new 100W PA use a positive trigger on transmit.? This kit is an easy way to interface these PAs to negative going radios on transmit.

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Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ

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Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

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Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it:

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Moderator: North American QRO Group at Groups.IO.

Moderator: Amateur Radio Builders Group at Groups.IO.

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email:? bill@...

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--
Jack, W8TEE

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It is such a pleasure operating the T41 with real power. People hear
me, they give me good reports. A total homebrew
kilowatt! And I had a couple of long, satisfying cross-country QSO's.

I finally got around to trying the K9HZ encoder cards. They sure do
make a neat installation. My first mistake was
to solder the IDC box connector first. That makes installation of all
the SMD caps pretty miserable. It was so hard
that on the second one, I *unsoldered* the IDC connector and removed it.

Removing the IDC connector was a bit of a pain. I sucked out the pins
with my Hakko, and then tried solder wick...it
wasn't going anywhere. Then I remembered "Mr Solderfix". He's a guy
who is an absolute master at PC board repair. I
had seen one of his Youtube videos... I got a piece of 14 gauge wire
and laid it down the middle of all those pins. I soldered it to all the
pins, heated it up some more, and ....the connector just fell out.

On this second board, I used solder paste and a hotplate for the SMDs.
Piece of cake!

Second mistake was to put both the connector AND the encoder on the
same side of the board... BAck to the radio - Nope, that's not going
to work. I unsoldered the encoder and put it on the other side.

Back out to the radio. Plugged in the encoders...They work!
Interestingly, my current software DOES have support for the
pushbuttons. I click the volume knob, and it changes from VOL to AGC.
Then Mic, then STn ( what's that? ) and then NFl ( what's that? ).

If I spin the volume knob fast, it misses a lot of pulses. I think
the .1uF capacitors have something to do with that.
Maybe .01's would make it more responsive?

- Jerry, KF6VB

?

It is such a pleasure operating the T41 with real power. People hear
me, they give me good reports. A total homebrew
kilowatt! And I had a couple of long, satisfying cross-country QSO's.

I finally got around to trying the K9HZ encoder cards. They sure do
make a neat installation. My first mistake was
to solder the IDC box connector first. That makes installation of all
the SMD caps pretty miserable. It was so hard
that on the second one, I *unsoldered* the IDC connector and removed it.

Removing the IDC connector was a bit of a pain. I sucked out the pins
with my Hakko, and then tried solder wick...it
wasn't going anywhere. Then I remembered "Mr Solderfix". He's a guy
who is an absolute master at PC board repair. I
had seen one of his Youtube videos... I got a piece of 14 gauge wire
and laid it down the middle of all those pins. I soldered it to all the
pins, heated it up some more, and ....the connector just fell out.

On this second board, I used solder paste and a hotplate for the SMDs.
Piece of cake!

Second mistake was to put both the connector AND the encoder on the
same side of the board... BAck to the radio - Nope, that's not going
to work. I unsoldered the encoder and put it on the other side.

Back out to the radio. Plugged in the encoders...They work!
Interestingly, my current software DOES have support for the
pushbuttons. I click the volume knob, and it changes from VOL to AGC.
Then Mic, then STn ( what's that? ) and then NFl ( what's that? ).

If I spin the volume knob fast, it misses a lot of pulses. I think
the .1uF capacitors have something to do with that.
Maybe .01's would make it more responsive?

- Jerry, KF6VB

?

I'm guessing the LPF is out of whack. I have 13W at the bottom of the
band,
and 9W at the top. I did check the passbands of the BPF on the bench.

- Jerry, KF6VB

I think I found it. Small matter of missing RF cables from the LPF to
the control card :).

- Jerry, KF6VB

On 2024-12-22 10:31, jerry-KF6VB wrote:

On 2024-12-22 10:25, jerry-KF6VB wrote:

I found it. The 2-pin header is now J10 on the Main Board.
Still no transmit though :(. Wonder if the software thinks there's
a
100W PA?

*** Doesn't seem to - that's actually a menu item in "RF Set". It
was

already set to zero.

- Jerry

Links:
------
[1] /g/AmateurRadioBuilders/message/5629
[2] /mt/110245804/243852
[3] /g/AmateurRadioBuilders/post
[4] /g/AmateurRadioBuilders/editsub/243852
[5]

/g/AmateurRadioBuilders/leave/11522011/243852/920863695/xyzzy



Links:
------
[1] /g/AmateurRadioBuilders/message/5630
[2] /mt/110245804/243852
[3] /g/AmateurRadioBuilders/post
[4] /g/AmateurRadioBuilders/editsub/243852
[5]
/g/AmateurRadioBuilders/leave/11522011/243852/920863695/xyzzy

?

I found it. The 2-pin header is now J10 on the Main Board.
Still no transmit though :(. Wonder if the software thinks there's a
100W PA?

- Jerry

On 2024-12-22 10:14, Oliver KI3P via groups.io wrote:

The 20 W PA has such a 2-pin header, the LPF control board does not.
IIRC (don't have the schematic in front of me) it gets the TX/RX state
through the 10-pin IDC connector.

-------- Original Message --------
On 12/22/24 7:31 PM, jerry-KF6VB wrote:

So - now my V12/K9HZ system receives fine. Time to try to transmit.
So
I scrounged up an RG316 cable to connect the TX output of the RF
board
to the LPF control card. Hit the mike button, and ...nothing.

Then I remembered - there's a signal that went from the old V11 LPF
to
the PA, to tell it to transmit.
+12V on transmit. There was a 2-pin header. Does the K9HZ LPF
control
card have such a header? I'm not seeing it on the schematic.

- Jerry, KF6VB

Links:
------
[1] /g/AmateurRadioBuilders/message/5627
[2] /mt/110245804/243852
[3] /g/AmateurRadioBuilders/post
[4] /g/AmateurRadioBuilders/editsub/243852
[5]
/g/AmateurRadioBuilders/leave/11522011/243852/920863695/xyzzy

?

The 20 W PA has such a 2-pin header, the LPF control board does not. IIRC (don't have the schematic in front of me) it gets the TX/RX state through the 10-pin IDC connector.

On 2024-12-22 10:25, jerry-KF6VB wrote:

I found it. The 2-pin header is now J10 on the Main Board.
Still no transmit though :(. Wonder if the software thinks there's a
100W PA?

*** Doesn't seem to - that's actually a menu item in "RF Set". It was

already set to zero.

- Jerry


Links:
------
[1] /g/AmateurRadioBuilders/message/5629
[2] /mt/110245804/243852
[3] /g/AmateurRadioBuilders/post
[4] /g/AmateurRadioBuilders/editsub/243852
[5]
/g/AmateurRadioBuilders/leave/11522011/243852/920863695/xyzzy