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I have been completing several stages with satisfaction according to the instructions on the website wb5rvz.org. Last week I finally had the possibility to start the receiver when I reached the RX_OpAmps part.

With great surprise and satisfaction, I verified how well it worked in the bands that I have selected for its construction: 17m-20m-30m, with great reception also in 15 m, 40 and 80 m, even in the om broadcasting band.

A few days ago I decided to continue and I have completed TX_OpAmp and there I am having problems.

The voltage data that had to be obtained when measuring the voltage of ICs U6 and U7 (double operational TLV2462CD) does not correspond to what was expected, the values being much lower than expected, the two circuits U6 and U7, give exactly the same measurement sequence voltage on its pins:
From PIN 1 to PIN 3 it should be 2.5v and the measurement I get is 1.75v
PIN 4 is the only correct 0v (ground)
From PIN 5 to PIN 7 it should be 2.5v and the measurement I get 1.72v, 1.75v and 1.76v respectively
Pin 8 should be 5v and the measurement I get 3.52v

I have gone through the entire assembly without success to find out if there was any confusion in the resistor values or any short or ground fault.
In the end - big mistake - I estimated that it could be a failure of the voltage regulator of the power supply, so I replaced the voltage regulator TL78L05 (U9 in the Softrock diagram), without any result. This was not the problem.
I decided to check how the inputs and outputs of the 7805 voltage regulator behave and I find this surprise:

? With the 7805 output pin in the air, without soldering on the board, I measure: PIN 1 (input) 12.3v and PIN 3 (output) 5.5v
? With the circuit connected on the board in place: PIN1 (input) 5.1v and PIN 3 (output) 3.5v

CONCLUSION: The source voltage drops when the 7805 regulator circuit comes into play. The 7805 heatsink gets very hot, plus the Dividers Stage components get hot too, including the U5 divider IC (74AC74 Dual D FF). As a result the softrock rxtx receiver has stopped working and I don't know how to solve the problem.

I would appreciate your help to solve these problems and continue with this interesting project.

Thank you.

José María, EA4B

I have been completing several stages with satisfaction according to the instructions on the website wb5rvz.org. Last week I finally had the possibility to start the receiver when I reached the RX_OpAmps part.

With great surprise and satisfaction, I verified how well it worked in the bands that I have selected for its construction: 17m-20m-30m, with great reception also in 15 m, 40 and 80 m, even in the om broadcasting band.

A few days ago I decided to continue and I have completed TX_OpAmp and there I am having problems.

The voltage data that had to be obtained when measuring the voltage of ICs U6 and U7 (double operational TLV2462CD) does not correspond to what was expected, the values ??being much lower than expected, the two circuits U6 and U7, give exactly the same measurement sequence voltage on its pins:
From PIN 1 to PIN 3 it should be 2.5v and the measurement I get is 1.75v
PIN 4 is the only correct 0v (ground)
From PIN 5 to PIN 7 it should be 2.5v and the measurement I get 1.72v, 1.75v and 1.76v respectively
Pin 8 should be 5v and the measurement I get 3.52v

I have gone through the entire assembly without success to find out if there was any confusion in the resistor values ??or any short or ground fault.
In the end - big mistake - I estimated that it could be a failure of the voltage regulator of the power supply, so I replaced the voltage regulator TL78L05 (U9 in the Softrock diagram), without any result. This was not the problem.
I decided to check how the inputs and outputs of the 7805 voltage regulator behave and I find this surprise:

? With the 7805 output pin in the air, without soldering on the board, I measure: PIN 1 (input) 12.3v and PIN 3 (output) 5.5v
? With the circuit connected on the board in place: PIN1 (input) 5.1v and PIN 3 (output) 3.5v

CONCLUSION: The source voltage drops when the 7805 regulator circuit comes into play. The 7805 heatsink gets very hot, plus the Dividers Stage components get hot too, including the U5 divider IC (74AC74 Dual D FF). As a result the softrock rxtx receiver has stopped working and I don't know how to solve the problem.

I would appreciate your help to solve these problems and continue with this interesting project.

Thank you.

José María, EA4B

Search the forum using "K3JZD" and you will come up with message threads from late 2014 and early 2015 that discuss a method of direct keying the RXTX that was flushed out by Warren 9V1TD and Alan G4ZFQ.

Jody

That's reminded me, some of those links here and some other methods.

73 Alan G4ZFQ

Brent,

To the best of my knowledge, there is no way to use the "Paddle" jack on a Softrock RXTX to generate CW. It has been quite a few years since I went down the road that you are now on. I found nothing back then. Seems like it was a RXTX "To-Do" item that was never completed. With a lot of help from the two gentlemen mentioned below, who knew much more about the RXTX than I did, a latency free solution which allowed the direct keying of the Softrock RXTX by using HDSDR and an external keyer that provides the sidetone was developed. All of that history is available here. What is in these posts is better than my memory of all of the details.

Search the forum using "K3JZD" and you will come up with message threads from late 2014 and early 2015 that discuss a method of direct keying the RXTX that was flushed out by Warren 9V1TD and Alan G4ZFQ.

In spite of some of the message titles, it is Semi Break In, not Full Break In. The HDSDR software will not support Full Break In, and that software is not open source. I have implemented this Semi Break In system, and I have successfully used my RXTX units for many CW contacts and during many QRP/QRPp events since then, without finding any shortcomings with this approach..

73,
Jody - K3JZD

On 29/09/2021 14:11, Brent DeWitt wrote:

Still don't see a way to configure the Ensemble's key input for transmit

CW just works with quisk - not much configuration needed

Thanks all for the advice. I will continue my question in the Quisk .io group. Still don't see a way to configure the Ensemble's key input for transmit, but I'll get there!
73,
Brent, AB1LF

I use an external iambic keyer to key one line of the key input jack. The keyer has a hardware sidetone which I prefer to use > 25wpm.

This gives me semi break in operation with quisk and the softrock.

You might want to take a look at

/g/n2adr-sdr

Best to ask on the n2adr-sdr group on groups.io if you get stuck.
When you click on the config button, the Config screen allows you to setup various radios. Softrock is the default just that you will have to specify the ttyUSB port, audio devices and other stuff like samplerate.

There is a "Help With Radios" tab where there is a great description of the setup procedure.
The setup is automatically saved, just restart quisk and you are good to go.
73 ... Sid.

--
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Senior Staff Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks

I must need to dig further into Quisk. While I have installed it under both Windows and Linux, I haven't discovered how to configure it to use the key input from the SoftRock. Thanks for encouraging me to take a deeper look!

On 26/09/2021 00:21, Brent DeWitt wrote:

Is there any software, other than Rocky, that uses the key input on an Ensemble RXTX?

As a bonus, is the latency low enough to use it with a side-tone?

Depends how fast you can send CW! OK up to 25wpm here. Over that I would use a hardware sidetone.

HTH

73
Nick

Is there any software, other than Rocky, that uses the key input on an Ensemble RXTX? As a bonus, is the latency low enough to use it with a side-tone? Seems like everything I've seen so far requires the CW key to be connected to the PC somehow.

TIA,
Brent, AB1LF

Good Morning Paul,

The parts for the external 40m LP filter are provided to supplement the LP filter that is on the RXTX board so that the 40m spurious output meets the FCC requirement of -43dB, otherwise the 40m spurious output is about -40bB.

A kW transmitter at -43bB spurious output is allowed 50mW spurious output. At -40bB the 40m spurious output of a one watt RXTX board would be 0.1mW so even amplified 20 times the spurious output would only be 2mW, much below what a kW is allowed.

The external LP filter parts are included in the RXTX kit to meet the FCC -43dB requirement.

Regards,
Tony, kb9yig

Excellent. Just the information I was looking for.
Thanks very much.

Paul,
I have the same version. The harmonics are sufficiently down on 30 and 20 but it was recommended to use an external LPF on 40 as the harmonics appear on 20. Myself, I never used a 40 LPF but also never used an amplifier. If your amplifier has a LPF for each band, you probably will be OK using it.
Gary
W9TD

I'm interested in the 40, 30, 20m version but wondering about the low pass filter. Is one required for each band?
I think the kit comes with parts for one filter?
Would these filters be usable if I were to add a 5w or 20w amp?
I having a hard time finding info about the rig but think I may have arrived at the right place.
Thanks.
73,
Paul VA3ZC

Just on ordinary Windows, it works fine as a sound output device. Delivers absolutely gorgeous sound to my Bose QCII headset.

Jerry,

Looks like it ought to work.
Have you enabled the "microphone" in Windows security?

73 Alan G4ZFQ

All,

I just indulged in a highly rated 192kHz USB sound adapter. It's a Behringer "U-Phoria" UMC202HD. For use with the Softrock, I had to get a couple of mini-stereo-phone-plug to two 1/4inch phone plug cables.

Unfortunately, I couldn't get it working. Rocky fails with various low-level OS complaints - stuff like "wrote to an illegal address". HDSDR won't even start the radio. This is on a Windows 10 desktop.

Just on ordinary Windows, it works fine as a sound output device. Delivers absolutely gorgeous sound to my Bose QCII headset.

- Jerry KF6VB

Hi, new to the group. What USB sound card were you planning to use? All I have is my Win7 laptop or a RasPi3B so PCI-E compatibility is non-existent

On 10/09/2021 02:54, jerry@... wrote:

Does the Teensy SDR do transmit?

Presumably you will have found the time to do a search.
If not then it seems to be basically an interface replacing a computer.
It seems any SDR can be used but does not look a simple job.

73 Alan G4ZFQ

Does the Teensy SDR do transmit?