SSB CW Adapter for Shortwave Radio BFO DIY KIT 455 kHz Beat Frequency Oscillator

Description

PLEASE, READ CAREFULLY!
All Information  is here!
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If you have doubts, please ask me before buy!
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This list is for
the "Wide Band External Beat Frequency Oscillator (BFO)".
SSB & CW Adapter for Shortwave Radio.
This DIY kit for the BFO is available with default frequency of 455 kHz!
It could be tuneup from 200 kHz to 800 kHz,
changing the capacitor C3 (high quality NP0 or Silver Mica).
THIS DIY KIT, IS NOT ASSEMBLED!
The package for this DIY kit is composed by:
1 x  PCB 2.5"x 1.5" ( Dual Side Copper )
BLACK*( see the pictures ).* Added Jan. 17.
1 x 455 kHz Oscillator Coil
1 x Voltage Regulator 78L06
1 x Varactor Diode BB304
1 x Potentiometer 10k + 1 Knob
1 x NP0 Multilayer Capacitor
5 x Disc Ceramic Capacitors
2 x Electrolytic Capacitor
5 x Terminals for PCB
2 x Transistors
7 x Resistors
All BFO must be stable!
Great to user with Short Wave Radio.
Is useful to listen SSB & CW signals!
Basic Characteristics (455kHz):
Adjustable range from center frequency of 455 kHz Δf +/- 50 kHz ( Coarse adjust - Red Coil ).
Adjustable range from center frequency of 455 kHz using the "Fine Tune" potentiometer ( Δf +/- 1.0 kHz ).
Excellent frequency stability, less than +/- 50Hz at stable temperature room!
( Measured with HP 5315A during the time of 1 hours! )
Output Level ( sine wave ) = 1.25Vpp under load Zout = 1k ohms ( At high Z load 2.2Vpp ) See Pictures.
( Measured with Tektronix 2430A and 10x probe).
Output signal with "Buffer Insulator" improve frequency stability, due to load variation.
Operate Voltage: 9 to 22 V ( With internal voltage regulator 78L06 ).
Minimum 6V without the regulator 78L06.
DIY KIT BFO 455 kHz (default ).
NOT ASSEMBLED!
Please, see all pictures for more details, with electronic schematic.
Download the pictures and the schematic for you!
No necessary instruments to do adjustment!
Only listen the beating frequency signal on the radio with IF of 455 kHz is enough!
Adjust the potentiometer at center, and do the coarse adjust at RED coil for the beating signal.
In some radios, do not need make wiring connections, only approaching the BFO!
But, the best way to achieve good performance, is the injection inside the radio, at last IF amplifier stage.
(Please, see all pictures )!
I would like suggest to you, the Crystal Frequency Marker !
It is useful to calibrate or verify the dial frequency of all shortwave receiver.
It generate harmonics frequencies to beyond 30MHz!
Please, see at Ebay Link below:
https://www.ebay.com/itm/202346150633
Please, be sure to see all my list, on the link below:
http://www.ebay.com/sch/haf_rio/m.html
Thank you!
Attention all Customers!
To US continenTal, shipping is via FedEx and cost .50.
To Canada, Europe, Australia and Japan, please conta me.
Please, inform your postal code to check the shipping cost!
Delivery details:
1. All item will be shipped by FedEx Economy.
2. Customs process in your country, must be considered as delay cause to delivery.
3. After you decided to bought, read and save ( download ) all pictures and information.
Please, if you do not agree with information above, do not buy!
Thank you!
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