The Original intent of today's post was to cover Prepper Antennas. You will see that in a couple of days.
The Breaking News is about your ARRL (I am not a member, and the following is more evidence of why not.). The Nerds of Newington have come up with a new bent straight from the bowels of the ARRL Lab. It is called the Clean Signal Initiative
The thrust of this effort is for transmitters (likely require all) to have a "clean" signal output. I put this effort in the realm of the SAVE Act. The object of that act is not a clean vote but to suppress the vote of the non-MAGA voters. C'mon Donald, all of us are not blind!
And so should you be not blind about the impact of the ARRL Proposal.
Open your eyes, for any new built ham transmitter to be legally sold in the USA it must be type accepted by the FCC. Kits for now slip under the radar as do homebrew transceivers/transmitters and boat anchors from the past. So why is the ARRL Lab taking on the job of the FCC?
Even the ARRL got a dose of their own medicine when they reissued the Tuna Tin Two project as the original design did not meet today's spectral purity standards.
But the biggest impact is to your wallet! The Far East Radio manufacturers will jump on this like a horny blonde. Their radio offerings will see a sale price increase to comply with the ARRL CSI rating, and you pay for it.
In truth these manufacturers likely will affix a sticker to the back of the radio stating CSI compliant and do nothing more and the price goes up by $100. Since all the Far East Radio Manufactures will do it, the relative price points do not change except an increase for all of us to bear just like The Trump Tariffs.
We previously mentioned the Apache Labs SDR Radio and they have already been addressing this with their pre-distortion approach. An Apache Labs radio median price = $4500
From Copilot
Apache Labs’ ANAN series is best known for one signature capability: PureSignal adaptive predistortion, a real‑time linearization system that dramatically cleans up your transmitted SSB signal by reducing IMD products by 20–40 dB. If you care about clean transmit audio, driving an external amp, or operating in crowded bands, Apache Labs radios are in a class of their own. Here’s a clear, structured breakdown of what they offer and why they matter.
๐ก What “Predistortion” Means in Apache Labs Radios
PureSignal (developed by Warren Pratt, NR0V) is an adaptive predistortion system built into the OpenHPSDR/Thetis ecosystem.
๐ What it does
๐ Apache Labs Models That Support PureSignal Predistortion
Below are the major models known for PureSignal capability, with notes from the search results.
ANAN‑10E
A real‑world example from WA6NUT shows:
๐งฐ Why Apache Labs + PureSignal Is Unique
Apache Labs radios are essentially lab‑grade SDRs with amateur‑radio‑friendly interfaces.
๐ก What “Predistortion” Means in Apache Labs Radios
PureSignal (developed by Warren Pratt, NR0V) is an adaptive predistortion system built into the OpenHPSDR/Thetis ecosystem.
๐ What it does
- Samples your actual RF output via a sampler or coupler
- Measures distortion products (IMD)
- Applies an inverse polynomial correction in real time
- Produces an extremely linear transmit signal
- Cleaner SSB, AM, and digital modes
- Dramatically reduced splatter on adjacent frequencies
- Ideal for driving solid‑state amps, which are more IMD‑sensitive
- Makes your signal look “lab‑grade” on panadapters
๐ Apache Labs Models That Support PureSignal Predistortion
Below are the major models known for PureSignal capability, with notes from the search results.
ANAN‑10E
- Proven PureSignal performer
- Frequently used in demonstrations of predistortion effectiveness
- Example setup: ANAN‑10E + HF Packer Amp + Ameritron AL‑811 using PureSignal sampling
- Modern successor platform
- 16‑bit ADC, 100+ dB dynamic range
- Thetis‑compatible
- Designed for high‑performance TX/RX with PureSignal support
- Pre‑order model from Apache Labs
- Next‑generation architecture with massive FPGA horsepower
- Designed for extreme linearity and high‑power operation
- Ideal for PureSignal with built‑in sampling ports on some amps
- Pre‑order deposit model from ML&S
A real‑world example from WA6NUT shows:
- ANAN‑10E running PureSignal
- Output sampled via directional coupler
- Amplified chain (HF Packer → AL‑811)
- Before/after panadapter images show dramatic IMD reduction
๐งฐ Why Apache Labs + PureSignal Is Unique
Apache Labs radios reward operators who appreciate:
- Clean transmit audio
- High dynamic range
- Open‑architecture SDR
- Ability to integrate external amps cleanly
- Experimentation with DSP and waveform shaping
Remember it was the ARRL who instigated the incentive licensing initiative, today's current no class Extra Class and now CSI. CSI will hit your wallet big time.
The CSI rating will likely impact home grown rigs and then the ARRL's unstated goal of 100% operating and contests will be achieved. The ARRL argument boils down to a Lab Grade SDR in every ham shack.
Them that know, survive.
73's
Pete N6QW










