Monthly Archives: April 2022

CT-S1000V: Tremolo EP

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I spent a little time with the Casio CT-S1000V this morning, trying to dial in a mellow Rhodes EP with tremolo. The Stage E.Piano tone is nice, but has auto pan instead of tremolo. I like tremolo since I usually go MONO into the live sound system.

Studying presets is always informative. The DSP tones, by default, have an Active DSP chain pre-configured. The Active DSP chain for Stage E.Piano is:

Amp Cab          -> Auto Pan         -> Auto Pan 
----------------    ----------------    ---------------- 
Type: RD-MK2-PRE    Rate:         68    Rate:         62 
Vari:          1    Depth:        80    Depth:        80 
Wet Level:   127    Waveform:   Sine    Waveform:   Sine 
Dry Level:     0    Manual:        0    Manual:        0 
Bypass:      OFF    Wet Level:    70    Wet Level:    70 
                    Dry Level:   100    Dry Level:   118 
                    Bypass:      OFF    Bypass:      OFF

Two Auto Pan stages? Well, let’s find this chain in the list of DSP combinations. What the? The default “Tone” DSP chain doesn’t appear in the DSP List!

The Trem 60’s EP has tremolo, so let’s take a look at its default Active DSP chain:

Amp Cab          -> Tremolo          -> Tremolo 
----------------    ----------------    ---------------- 
Type: WR-200-PRE    Rate:         92    Rate:         92 
Vari:          3    Depth:        64    Depth:        64 
Wet Level:   112    Waveform:   Sine    Waveform:   Sine 
Dry Level:     0    Wet Level:   100    Wet Level:   100 
Bypass:      OFF    Dry Level:   100    Dry Level:   100 
                    Bypass:      OFF    Bypass:      OFF

Two Tremolo stages and once again, such a DSP combination is not listed User Guide DSP List!

Well, DSP combi number 33, Drive Amp 2, is close to what we need. Starting with the Stage E.Piano tone, I changed it’s Active DSP programming to:

Drive          -> Tone Control   -> Amp Cab          -> Tremolo 
--------------    --------------    ----------------    ----------------
Type:  Crunch3    Low Freq:  400    Type: RD-MK2-PRE    Rate:         82
Gain:       70    Low Gain:   +3    Vari:          1    Depth:       120
Out Level:  70    Mid Freq: 2.5k    Wet Level:   100    Waveform:   Sine
Wet Level: 127    Mid Gain:   +5    Dry Level:     0    Wet Level:    70
Dry Level:   0    High Freq : 5k    Bypass:      OFF    Dry Level:    60
Bypass:     ON    High Gain:   0                        Bypass:      OFF
                  In Level:  127 
                  Wet Level:  68 
                  Dry Level:   0 
                  Bypass:    OFF

The Bypass parameter comes to the rescue. I didn’t like any of the Clean drive types, so I disabled (bypassed) the drive stage.

The Tone Control boosts the MIDs adding warmth. The Amp Cab model is a Rhodes Mk2 preamp — the same model in the stock Stage E.Piano tone. These Tremolo settings just sound right to me. Of course, you’re welcome to play with any of these settings.

I uploaded updated registration banks, including the Stage E.Piano tremolo. Please see the CT-S free registrations page for a link to the ZIP file.

Have fun!

Copyright © 2022 Paul J. Drongowski

RTL-SDR: Earth ground are easy

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If you’re into software defined radio and you’re looking for better HF reception, invest time in your antenna system and grounding.

I don’t have the space to string a dipole, so I’m working with a simple (random) long wire antenna. The long wire antenna is connected to an RTL-SDR receiver through a Nooelec Balun Nine One and a short length of coaxial cable. The long wire is connected to the antenna input on the balun.

Unfortunately, my early experiments with grounding did not work out very well. I tried connecting the balun ground port to various cold water pipes in the house. I do not recommend using house ground. House ground merely adds a mess o’noise to the original signal — bad, bad, bad. Thus, I left the balun ground unconnected and pressed on.

With the start of the war against Ukraine, I began monitoring HF, again, just to hear what I can hear on the left coast of North America. If you are interested in Europe and Ukraine specifically, I recommend the Wide-band Web SDR at the University of Twente in the Netherlands. Aside from radio access, there is an active chat area. Twente gets you much closer to the action.

Counterpoise

Counterpoise is a fancy name for wires or cables that substitute for an earth ground.

If you cannot connect to an earth ground, you should consider adding a counterpoise to your long wire antenna. Sounds like work, but it’s simple! Just connect another long wire to the ground side of the balun. String the counterpoise in the opposite physical direction of the long wire antenna. Done.

Consistent with my usual sleazy methods, I grabbed a 25 foot length of bell wire, twisted the pair at both ends, and connected one end to the balun ground. This quick and dirty counterpoise was good enough for +3dB or so in signal-to-noise ratio (SNR) as measured by Airspy SDR-Sharp.

A weeder?

My studio window is about 15 feet above ground, so it made sense to drop the bell wire out of the window and connect it to earth.

Really? A garden weeder for an earth ground rod!

A good earth ground typically consists of 4 to 8 feet of grounding rod buried in the earth. I know there are drain pipes located in the ground beneath my window and frankly, planting 4 feet (8 feet!) of rod sounds like too much work. So, I grabbed a garden weeder — yes, a garden tool — and stuck it in the ground. Then I wrapped the end of the bell wire around the weeder.

This quick and literally dirty solution was good for about +12dB (or more) improvement in the SNR.

Metal edging stake

I didn’t want to expose the weeder to good old Pacific Northwest wet weather and found a cheap, simple substitute — a galvanized metal edging stake. Normally, one uses edging stakes in the garden. However, they are inexpensive and expose more surface area to the earth than a weeder. 🙂

Edging stake

I upgraded the bell wire to 16 gauge primary wire. Unfortunately, the primary wire makes it more difficult to close the sliding window into my studio. The bell wire is flatter and mushable.

Inexpensive edging stake earth ground

As to SNR, I’m getting similar results. Unless I get the gumption to drive a grounding rod, this is close enough for rock and roll. (73)

If you would like more help with software-defined radio (SDR), here are links to my earlier posts:

Copyright © 2022 Paul J. Drongowski, N2OQT