The 515's versatility is limited by its modest selection of AM bandwidths. We offer custom accessory-filter PC boards to solve this problem. With our two-filter board, a 9 or 15-pole 8-kHz ceramic filter can be added to improve the muffled audio that occurs with the standard AM filter. This board will accommodate two ceramic filters or one ceramic and one crystal filter.

• 9-pole filter mounted on board: $99.00 US (Other filters available: 15-pole 14 & 8 kHz @ $119.00)
• Second ceramic filter either: $79.00 or $99.00 US

Optimization of the Sherwood filters, plus a vast improvement in performance of the existing AM filter can be realized with circuit changes on the main receiver board. A 30-dB increase in ultimate rejection of the standard filter is typical.

• Circuit modifications: $79.00 US
• Alignment of the receiver's multiple oscillators: $45.00 US

For those who need more than two accessory filters, step up to the 4-filter switching board. This plug-in board allows six filters to be selected from the front panel.

• Relay board: $249.00 US (Filters extra)
• Installation: $49.00 US

Please feel free to contact us to discuss selection of filter bandwidths best suited to your needs and interests.

Japan Radio NRD-525 / 535 A modification is necessary to use the NRD-525 or 535 with the Sherwood SE-3 phase-locked detector. An i-f output must be added to the set to feed our unit. A 9-volt 30-mA output on rear of the set can be rewired to provide i-f output, or a jack can be added. The i-f board can still be unplugged as before.

• This change can be done in the field on the 525, or in our shop: $45.00 US
  (Field modification for 535 is possible but not recommended)
• Buffer amp / filter board for 535, including installation: $145.00 US

We recommend the addition of our 9-pole CN-8000 8-kHz filter with shape factor of 1.7:1. Other choices include 14, 6, and 3.8 kHz units. Our 9-pole filters can replace the existing AM filter. We can also install JRC 1.8- kHz or 1.0-kHz filters, though their CW filter is not recommended due to poor shape factor.

The Sherwood CN-400 is suggested for CW & narrow-shift RTTY reception:

• CN-8000, CN-6000, & CN-3800: $99.00 US each
• CN-400CW filter: $199.00 US
• Installation: $10.00 US per filter
• CN-9000/15 & CN-14000/15: $119.00 US

Authorized Dealer Japan Radio

Authorized service center for JRC products. Sherwood modifications also offered.

• IF output for 525: $45.00 US
• 535 filtered/buffered IF: $145.00 US installed


New Receiver Pricing:

• Stock NRD-345: Discontinued
• Refurbished NRD-535D currently listed on QTH.com



Shipping Information

Japan Radio NRD-345 This is the best sub $1000.00 radio on the market. It has the quality and feel of all JRC products at a modest price. When teamed with the SE-3 Mk III Standard or Deluxe, this package offers superior audio reproduction and great DX listening. You do not have to give up great ergonomics to have an affordable radio. Requires BUF-3: $55.00.

• NRD-345: Discontinued
• Modification of your existing 345 available at our lab.

Eliminate AGC Attack Distortion on AM
The AGC attack speed of the 345 is way too slow. We can modify the radio to eliminate this problem, providing the same fine AGC on AM as on SSB.

• Modification: $49.00



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Japan Radio NRD-545 This is JRC's current production DSP Radio. It has the quality and feel of all JRC products. This unit is not compatible with the SE-3 Mk III. This receiver offers superior band width flexibility with a turn of a knob. UHF converter and TCXO accessories available.

• Sherwood DSP Protection Filter Modification for NRD-545: $139.00 US, parts and labor

DSP Protection Filter Replacement
The DSP (digital signal processor) chip in the 545 is proceeded by a 15 kHz 9 pole ceramic filter. This protects the digital processor from strong station that are 10 kHz or more away. On shortwave bands however, very strong adjacent-channel signals are only 5 kHz away and can overload the DSP chip. We offer a replacement filter that is 8 kHz wide instead of 15 kHz, which attenuates 5 kHz off frequency by 40 dB. This modification reduces the maximum bandwidth of the radio from 9.9 kHz to 8 kHz. A modest trade-off for significantly improved adjacent-channel overload characteristics.

• Replacement 8 kHz 9 pole filter: $79.00 US
• Replacement 6 kHz 9 pole filter: $79.00 US
• Installation: $50.00 US

Field installation is possible but very good desoldering tools are required or serious damage can occur to the processor board.

Make the R9000 the Ultimate Receiver! The fantastic Icom R9000 receiver is near perfect except for two areas: Poor AM selectivity choices No synchronous detector

Sherwood offers the following modifications for this fine radio.

Enable the 6 kHz filter that is only used on SSB, and add the needed switching logic for Standard and Custom filter selection.

Stock selectivity on AM: 15 kHz, 9 kHz and 3 kHz.

Custom selectivity on AM: 15 kHz, 9 kHz, 6 kHz, and 3 kHz.

NOTE: With our logic board you get all four bandwidths listed above.

Second, add the necessary down converter to provide an IF output at 455 kHz for our world-renowned SE-3 Mk III synchronous AM detector.

• Filter selection upgrade and logic board, installed: $295.00 US
• Down converter and buffered filter board at 455 kHz, installed: $295.00 US
• SE-3 MK IV: $695.00 US
• Replacement rear panel with cooling fan: $149.00 US

PRE-4 Preamp

10 dB high-dynamic range preamp. Relay switched when DC supplied. +33 dBm input intercept. Similar to preamp in Drake R-7 receiver. Operates on 12 to 14 volts DC at 100 mA. Rated at 500 kHz to 50 MHz, though usable above and below that frequency. Switchable from front panel of Icom R-9000 receiver.

• Amplifier board only: $75.00 US
• Add 30 MHz low pass filter: $30.00 US
• Amplifier in mini-box: $125.00 US
• Amplifier in Pomona cast aluminum box with BNC connectors: $189.00 US