Now compare the proposed RF mask with my measured spectrum. At 200 Hz from Fc, the current raised-cosine shape from my 7000DLE with Thetis *just* fits under the stepped curve. But at -60 dB, it just barely falls short. It's so far down, that it has a de minimis effect.

From G3OTK's article at https ...

Keyed bandwidth and its relationship to information rate is best answered by these authors on the subject:

https://www.w8ji.com/cw_bandwidth_described.htm
https://www.ivarc.org.uk/uploads/1/2/3/8/12380834/keyclicks_version_1.pdf
https://w9cf.github.io/articles/click.pdf
https://www.w8ji.com ...

Juha,

What's being missed here is that you're hyper-zoomed-in on the CW waveform spectra -- and it looks worse than it is. You've expanded each horizontal division to 200 Hz. At 200 Hz from Fc, your keying sidebands are approximately -40 dBc.

I conducted the same test, 200 Hz/div. using an Rx1 ...

Under General>F/W Set, try reducing Rx1 Sample to 192K to first see if that has any effect on the problem.

Paul, W9AC

Gary,

Thanks for the suggestion. The setup screen was very intuitive; I had it up and running in about five minutes, including the web server.

Paul, W9AC

It's interesting that leakage is similar between the 7000 and G2 models. As shown, an approximately 24 dB IMD improvement on 10m is a substantial numerical improvement. But even with the jumper in place - 50 dBc is still quite good, made even better with the jumper removal.

It also proves that the ...

Nicely built using the recycled Pomona enclosure! Be mindful that the In/Out BNC jacks are good up to about 1200W into a 50-ohm resistive termination. The connector's 500V rating is a limit during high SWR conditions.

Paul, W9AC

I bought the Mercury III PCBs from Kenny and was instructed to purchase the firmware from Victor. I assembled my Merc III and still using it. Spare PCBs are compatible and I am keeping them for a rainy day.

73
Bhanu
VU2MB
Thank you, Bhanu. Despite claims made in the owner's manuals, I believe ...

Attached are measurements of RL-2 Isolation in a G2 manufactured in 2024 as a function of frequency from 2-30 Mhz. Also attached is the functional block of the 8000 showing that it too is likely to benefit by this simple but effective improvement.
K1VF
Well done...

I suspect only a small ...

@W9AC

I saw this post and am interested in your capacitive sampler.
I was wondering how the attenuation was related to the capacitance values.
To the eye, C2 and C3 appear to be in series when looking at the PC board image although they're not. They're electrically in parallel and laid out that ...

The termination Z at the PureSignal sampling port is at or near 50+j0. The PureSignal load does not (or should not) appreciably change as a function of frequency, even with changes in 50-ohm sampling cable length and nothing else is in the sample signal path. The capacitive sampler performs no ...

Paul,

Thank you for that advice, I have thought about that but I'm not nearly savvy enough to know how to design such a circuit.

Mark
I've linked to a project on Oshpark in case you want to try one day. Oshpark receives all proceeds.

The parts BOM shows the required SMD caps. Additionally ...

I built my own ugly but effective pure resistive 18k-ohm sampler, usable everywhere from 40 watts to 1.5k watts.

Mark

Mark,

At some point, you may want to consider replacing that large string of resistors with two 1KV SMD capacitors to yield a -50 dB coupling coefficient with a flat sampling ...

I use an external hardware leveler/limiter ahead of a USB audio interface to protect its input from periodic sloppy mic positioning. It's set at a low compression ratio until peak audio is reached and is mostly transparent. It's probably not needed with headsets unless one gets carried away during ...

I have a lot of respect for the craftsmanship of your designs, including the preamplifier proposal for the G2. Do you think it could replace the current version? If so, how would you implement it? A detailed description/wiring diagram would be useful. It would really help a lot in the development ...

It was brought to our attention by several key stakeholders that the ANAN-G2 1K5 model could potentially be modified to operate as a Linear Amplifier by bypassing the internal Saturn card. Given the regulatory implications of such modifications, it was recommended that we seek type approval for ...

Dig deeper.

I found the LPF board designed and manufactured by RZ1ZR, saved by archive.org in 2018. It no longer appears in the same form and layout as shown on his current website.

Now compare it to the Mercury III LPF board as shown by AE5X on his blogspot.

Both images attached.

The topic ...

Sorry if this is a dumb question , is there any benefit to using a sampler/pure signal on digital modes like Ft8 ?
Not when operating most FSK modes like FT8 unless you operate in "Fox" mode where up to five carriers are generated, 60 Hz from each other. Otherwise, FT8 is a single frequency ...

Thankfully, RF is visually blind. Some of best performing devices I've measured are aesthetic nightmares (and vice versa).

I've no idea about the KM3KM sampler but it's likely a local project from Miami. My understanding is the Lux and Mercury III amps are designed by RZ1ZR (not just the LCD ...

The FCC's position is that if a device is capable of transmitting outside of the designated amateur radio bands and on frequencies that require certification, then certification is mandatory. When else is certification required? If a device has RF scanning capabilities, FCC certification is required ...

First, thanks to all who replied with suggestions...

I finally solved the IQ output problem by reducing the Rx1 sample rate from 1.536 Mbps to 384 kbps. Until then, no real progress was being made.

Thetis version: 2.10.3.5
P2 FW: 2.2.2

Paul, W9AC

The VAC range was set early on to accept 8 kHz to 196K sample rates. That was from Nigel, a long time ago. However, I just forced all VAC cables to a 48 kHz SR and the overflows stopped. That corrects the spur problem but there's still no decode.

CW Skimmer is integrated with SDC software. Setup ...

w9mdb wrote:Turn off SwapIQ maybe?

Required to have IQ Swap for Skimmer and makes no difference whether checked or not. Also, I failed to mention that non-VAC audio is severely distorted any time IQ is activated. All Thetis Audio Setup parameters are the same as Richie's.

Paul

I am trying to activate SDC CW Skimmer with Thetis by following Richie's YouTube tutorial linked here:

https://www.youtube.com/watch?v=iQd_E4ffO-w

VAC is used for IQ data transfer between Thetis and CW Skimmer. Past group posts have indicated that VAC and IQ don't mix together well, but ...

Also discovered the amp does not pass any signal to the -55 output when powered off or on in bypass mode.
Same amp here. Since you already have the XDC directional coupler, place it in-line with the amp's RF output jack. I switch between multiple desktop amps and have no need for the internal ...

Juha,

I received your PM and e-mail messages today...

There's no need to use anything but the default Thetis values unless you're trying to extract faster CW performance from Thetis. There are many moving parts between Thetis CW setup values and Winkeyer. I have included my setup screens as a ...

KC2QMA wrote:Maybe it can be combined with the built in Timer Reminder feature in OPTIONS 2 menu ?

https://www.youtube.com/watch?v=-KSlMNyN8U0

Nice work from KE9NS. That's a slick ID implementation with several options.

Paul, W9AC

Now hold on just a minute. All you guys advocating for a voice/cw id feature have to get in line behind me.
My requests for an echo unit and a roger beep takes precedence!

73,

Bryan
W4WMT
Already done. Well, one of them anyway. For grins. I created a "Quindar" end-of-message tone as used by ...

Perhaps the solution to this is to simply queue up an ID for transmission and indicate to the operator an ID is pending. Then the next time the operator transmits the ID will be transmitted. IMHO that would be good enough, certainly within the spirit if not the letter of the law, and would ...

How does it prevent the ID'er transmitting when someone else is already transmitting?
On the SSB nets I'm part of, and listen to...well, the CW ID transmits over the existing conversation. I've never found it to be a problem, possibly others have. The FCC is fine with an automated transmission ...