HEATHKIT 85-2957 Board HW-9 T/r P/n

( Brand: Heathkit ), ( Manufacturer Part Number: 85-2957 ), ( Part Type: Board )

Review HEATHKIT Hw-9 T/r Board P/n

The Heathkit 85-2957 HW-9 T/R (Transmit-Receive) Board is a crucial component for amateur radio operators and hobbyists working on Heathkit's HW-8 and HW-9 series communications receivers. This board is designed to handle both transmit and receive functions, making it an essential piece in setting up a fully functional radio station.

The HW-9 T/R Board is meticulously engineered with a combination of high-quality electronic components. It includes a balanced modulator section, which is responsible for amplifying the audio signal before it is transmitted. This section ensures minimal distortion and noise, contributing to a clear and robust radio transmission.

On the receiver side, the board features a high-performance mixer and a quadrature detector. The mixer is responsible for combining the incoming radio frequency signal with a local oscillator frequency. This process results in a difference frequency that can be processed by the receiver's amplifiers and filters. The quadrature detector, in turn, extracts the in-phase and quadrature components of the received signal, which are essential for accurate demodulation and decoding of various radio communication formats.

The HW-9 T/R Board is also equipped with several protective circuits to ensure safe operation. These circuits include a keying circuit for controlling the transmitter, a high voltage blocking diode to protect the receiver from transmitter overload, and a DC power protection circuit to prevent reverse battery connection.

The board measures approximately 7.5 inches by 5 inches and is designed to fit seamlessly into the HW-8 and HW-9 series communications receivers. It comes with comprehensive documentation, including a detailed assembly manual and wiring diagrams, to help users through the installation process.

In summary, the Heathkit 85-2957 HW-9 T/R Board is an essential accessory for amateur radio enthusiasts looking to build or upgrade their communications receivers. Its high-performance transmit and receive functions, combined with protective features and easy installation, make it a must-have component for any serious radio hobbyist.

The Heathkit 85-2957 HW-9 T/R (Transceiver) Board is an older piece of radio communication equipment designed primarily for amateur radio use. Here are some pros and cons that may help in making a decision about purchasing this particular component:

1. Long-standing reputation: Heathkit is a well-known and respected brand in the amateur radio community, known for producing high-quality electronic kits and components.

2. Versatility: The HW-9 T/R Board is compatible with various amateur radio transceivers, making it a versatile addition to a radio station setup.

3. Analog design: The all-analog design of the HW-9 T/R Board may appeal to those who prefer a more traditional approach to radio communication.

4. Learning opportunity: Building and setting up the HW-9 T/R Board can be a valuable learning experience for radio enthusiasts and electronics hobbyists.

1. Age and obsolescence: The HW-9 T/R Board is an older design, and as such, it may not be compatible with the latest radio technology or software.

2. Availability of parts: Due to its age, finding replacement parts or components for the HW-9 T/R Board may be challenging and time-consuming.

3. Complexity: The HW-9 T/R Board can be quite complex to set up, especially for those who are new to amateur radio or electronics.

4. Power requirements: The HW-9 T/R Board has relatively high power requirements, which may necessitate the use of an external power supply.

In conclusion, the Heathkit 85-2957 HW-9 T/R Board can be a valuable addition to an amateur radio station for those who appreciate the traditional all-analog design and are comfortable with the complexity of setting it up. However, its age and potential obsolescence, as well as the availability and replacement of parts, should be carefully considered before making a purchase.

The Heathkit 85-2957 HW-9 T/R Board may be a good investment for those who are experienced amateur radio operators, have a preference for all-analog designs, and are willing to invest the time and effort to set it up and maintain it. For those who are new to amateur radio or prefer a more modern and streamlined setup, alternative options may be more suitable.

Details:

Lots of parts' band switch wafers, IC's, torrid, SBL-1 mixer, 404-640 crystal filter. , finals, lots RF coils. Not tested, but looks pretty complete. We did not receive a response so we'er putting it here for those of you that can use. Certainly worth the $30.00 asking price.

Heathkit HW-9 T/R Board P/N 85-2957, We were asked by a customer to pull the board from an in 'boneyard' so they could recover wafer switches.

part #: 852957 price

• $275.00

specifications vintaelec:

• brand: Heathkit
• mpn: 85-2957
• part type: Board

shipping vintaelec:

• class: Expedited
• cost: $14.00
• service: USPS Priority Mail
• carrier: USPS
• transit: 5-11 Days
• type: Fixed

offer vintaelec:

• started: January 23, 2026
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• sold: 0

general vintaelec:

• Consumer Electronics > Vintage Electronics > Other Vintage Electronics
• condition: Used

seller vintaelec:

• rating: 99.7%
• # reviews: 5962
• city: Pleasanton, California

payments vintaelec:

• other
• wallet: Google-pay
• credit card: Visa

returns vintaelec:

• policy: Returns Accepted
• paid by: Buyer
• method: Money back
• time: 30 Days

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