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The Chameleon CHA M-COIL is a rugged inductive loading coil designed to lower the resonant frequency of compatible Chameleon vertical whip antennas, providing an effective way to extend portable antenna operation onto the lower HF bands.
Designed primarily for use with the CHA SS17 telescopic whip, the M-COIL allows a compact vertical antenna system to operate effectively on lower frequencies including the 30 and 40 metre bands.
Extend Your Vertical onto the Lower HF Bands
A physically short vertical antenna normally becomes increasingly difficult to use efficiently as the operating frequency is lowered.
The CHA M-COIL introduces inductive loading into the antenna system, electrically lengthening the radiator and allowing resonance to be achieved at substantially lower frequencies without requiring a full size quarter wave vertical.
This makes it particularly useful where portability, deployment time or available antenna height are important considerations.
Using the CHA M-COIL with the CHA SS17
When used with the 17 ft CHA SS17 telescopic whip, the M-COIL provides an excellent portable solution for lower band operation.
For 40 metre operation, the SS17 can be extended to approximately 16 ft when used with the M-COIL.
For 30 metre operation, the whip can be shortened to approximately 7 ft 5 in.
These measurements should be treated as starting points. The final resonant frequency will depend on the radial arrangement, ground conditions, nearby objects and the surrounding environment.
For best results, the antenna should always be checked and adjusted using an antenna analyser or SWR meter before transmitting.
The CHA SS17 can also be used without the M-COIL for operation across higher HF bands.
Power Handling
The CHA M-COIL is rated for:
- 200W SSB
- 100W CW
Always observe the lowest power rating of any component within the complete antenna system.
High duty cycle operation may require additional consideration, particularly during prolonged transmissions or in high ambient temperatures.
Radials and Counterpoise
As with any loaded vertical antenna, the ground or counterpoise system plays an important part in overall performance.
Using a suitable radial system can improve antenna efficiency and help produce a more predictable resonant point.
Changes in radial length, soil conditions, nearby objects and installation position can all affect antenna tuning.
For best results, assemble the complete antenna in its intended operating position and check resonance before transmitting.
Ideal for Portable Operation
The CHA M-COIL is a simple way to increase the lower band capability of the CHA SS17 without carrying a significantly larger antenna.
Its robust construction, straightforward installation and 200W SSB power handling make it particularly well suited to portable HF stations, field operations and temporary antenna installations.
Key Features
- Inductive loading coil for the CHA SS17 telescopic whip
- Extends operation onto lower HF frequencies
- Ideal for 30 and 40 metre configurations
- 200W maximum power handling on SSB
- 100W maximum power handling on CW
- Ideal for portable and field antenna systems
- Rugged construction for repeated deployment
- Designed for use with an appropriate radial or counterpoise system
Shipping & Delivery
We offer UK and international delivery services, including next working day and selected weekend options for eligible orders. Available services, prices and estimated delivery times are displayed at checkout.
Delivery Information
Delivery options depend on the parcel's size, weight, contents and destination. Express and weekend services are subject to availability and cut-off times. Oversized or exceptionally heavy items may require a specialist delivery quotation.
Returns & Cancellations
To arrange a return, please contact ML&S or complete our returns form. You may also exercise your statutory right to cancel by email or another clear statement, without completing the form.
Changed Your Mind?
Under the Consumer Contracts Regulations 2013, most purchases made online or by telephone can be cancelled within 14 days of receipt.
You must notify us of your cancellation within this period and return the goods within a further 14 days.
Please handle all goods with care. Returned items must be in a resaleable condition, complete with their original packaging, and all supplied accessories.
You may inspect goods as you would in a shop. Handling beyond what is necessary to inspect them may result in a lawful deduction for diminished value.
Exceptions
Modified Equipment & Reversal Charges
Additional return conditions may apply to equipment modified at the customer's request, including wideband transmit or receive modifications.
ML&S may charge a reasonable fee to reverse physical modifications and restore the equipment to its original factory specification. Any such charge will be agreed in advance and deducted from your refund.
Custom-Made Cable Assemblies
Coaxial cable assemblies manufactured to a customer's specifications are excluded from the 14-day return policy and are non-refundable unless faulty.
Software & Labour Charges
Labour and modification charges requested by the customer are non-refundable once the work has been completed.
Computer software may only be returned under the 14-day return policy if it remains sealed and unopened.
Return Postage Charges
Customers are responsible for the direct cost of returning unwanted or incorrectly ordered goods, where permitted by law. You may arrange your own suitable return postage or use one of our optional prepaid services.
Standard Parcels
Royal Mail Return Label
£5.95
Per parcel
For eligible standard-sized parcels, subject to Royal Mail restrictions. Free collection included.
Larger Parcels
DPD Return Label
£7.95
Per parcel
For larger or heavier parcels and any shipments with batteries.
Collection Service
DPD Collection
£25.00
Per parcel
Available upon request for eligible addresses, subject to availability.
Prepaid return charges will be confirmed before booking and deducted from your refund.
These prices apply to eligible UK mainland returns. Oversized items, specialist products and returns from other destinations may require a separate quotation. Estimated return costs will be disclosed before purchase.
Faulty or Incorrectly Supplied Goods
Return postage charges do not apply to faulty, damaged or incorrectly supplied goods returned under statutory rights. ML&S will arrange a free return in these circumstances.
Refunds
Refunds are processed without undue delay following receipt and inspection of returned goods, and no later than 14 days after we receive goods returned under statutory cancellation rights.
Refunds will be issued to the original payment method. Any prepaid return postage charges or lawful deductions for diminished value will be itemised.
Warranty Terms & Conditions
New Equipment Warranty
Minimum 2-Year Warranty
All new products supplied by ML&S carry a minimum two-year warranty against manufacturing defects, excluding batteries, which are covered by separate warranty terms.
Some manufacturers provide extended warranties, such as the three-year warranty available on eligible Yaesu equipment. Any additional coverage is subject to the manufacturer's terms and conditions.
Our workshop may assess and repair faulty equipment on site or refer it to the manufacturer or an authorised service centre where necessary.
Warranty exclusions may include batteries, normal wear and tear, accidental damage, misuse and unauthorised modifications, as specified in the applicable warranty terms.
All warranties are provided in addition to your statutory consumer rights against ML&S, which are not limited by the warranty period.
International Returns & Warranty
Unless otherwise stated, ML&S warranty servicing is carried out in the UK. International customers must contact us before returning goods to confirm shipping and customs requirements.
International customers are responsible for return postage unless the goods are faulty and ML&S has been notified within a reasonable time.
ML&S accepts no responsibility for additional charges resulting from incorrectly completed customs documentation. Any additional duties charged to ML&S as a result will be billed to the customer before return of the goods.
Need Help With a Return?
Our team can assist with returns, postage arrangements, modifications and warranty claims.
Nothing in these terms excludes or limits your statutory consumer rights.