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The SW300 AM Field Strength and Modulation Monitor

Schlockwood's SW300 is a compact and economical portable field strength meter and modulation monitor for medium-wave AM broadcast applications.  It meets needs ranging from those of Part 15 hobbyist operators to commercial AM broadcasters.

The SW300 is supplied with our calibrated Goldring antenna and an AC mains power adapter.  In the field the SW300 may be powered by an optional, readily-available and inexpensive rechargeable battery pack.

Please download the SW300 data-sheet for application details, features and specifications. Be sure also to watch our introductory video! Addi-tionally, upon request we will happily email you a PDF of the SW300 Man-

ual (an illustrated Setup and Operating Guide) that even more thoroughly details SW300 applications and operation.

Requests for additional information and pur-chasing inquiries may be directed by email to:                                      .


Shipping now!

With the industry now catching-up on component supply issues, we have finally been able to schedule and build the first formal production run of the SW300 Field Strength and Modulation Monitor.  Following Beta-testing of pre-production units, the first full production run of SW300s is shipping now.

And the price?

Despite supply-chain, shipping-cost and inflation-related increases, we're able to hold our initially-predicted selling price at $760.  This includes the SW300, an AC power adapter and the calibrated Goldring antenna.  USPS Priority Mail shipping to US destinations runs $30 or less depending on distance.  (Please see Sales and Shipping Notes below for further delivery stipulations.) 

From the field...

Tech Questions?

We'll get right back to you with the right answer, just write us at:


Sales and Shipping Notes:

For the present, the SW300 is sold exclusively on a factory-direct basis.  We are able to accept PayPal, Zelle, money orders, cashier's and personal checks (shipment pending clearance of personal checks).  We ship by USPS Priority Mail, insured by default as explain below.

As the public turns increasingly to Internet sales, the instance of 'porch piracy' of home deliveries has become a real problem.  Once shipped, neither we nor the carrier can be responsible for items pilfered from your porch.  We seriously recommend delivery to a residence with someone at home, to a business address that can accept your shipment, or to specify that the parcel be held for pickup at the carrier's facility (e.g., The UPS Store).

Factory-direct sales bear the additional modest expense (at just our cost) of insurance for the full amount of the sale and a signature required upon delivery, unless the buyer opts-out of this protection in writing when the order is placedThanks for your understanding toward our mutual protection, and please consider options and implications carefully before opting-out. 

Technical or application questions will be answered promptly, and sales inquiries quoted individually.

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