 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
*** Build the 1-DER 40 *** |
|
|
|
A ONE TUBE 40-METER QRP TRANSCEIVER |
|
|
|
Anything less would be two cans and a string... |
|
|
|
*** New Lower Price & Now Purchase Using Paypal! *** |
|
|
 |
|
|
 |
|
|
|
 |
|
|
|
Battery snaps on pc board, shown on the left, allow 9-volt batteries to be quickly replaced. |
|
|
|
|
|
 |
|
|
|
|
|
 |
|
|
|
|
 |
|
|
|
|
|
Harmonic filter, shown above, insures a clean output signal. |
|
|
|
|
|
|
Here Is What's Included In Kit:
Punched, Powder Coated & Silkscreened .040 Aluminum Enclosure
All Components & Hardware
Dual Triode (3A5)
Earphones
7.040 MHz Crystal (7.110 MHz & 7.030 MHz Available)
Professional Quality Circuit Board, Silkscreened & With Solder Mask
Detailed Assembly Instructions
Kit Price: $89.97 Plus Shipping |
|
|
|
|
|
|
|
1-DER 40 QRP Transceiver Kit |
|
Questions? Email KG4HSY |
|
|
|
|
|
|
|
|
7.110 MHz Crystal |
|
|
|
|
|
Kits are in stock and ready to ship. All kits ship by US Postal Service Priority Mail. Delivery time is about 3 days or less to most locations in the US. Kits ship same or next business day after your order is received so you will have your kit fast! |
|
|
|
|
|
|
|
|
|
7.030 MHz Crystal |
|
|
|
|
|
|
|
|
If you prefer to mail in your order, click here for a printable order form. This is a .doc file. Open or save and open in Windows NotePad or similar word processor. This order form can be filled out using your word processor. |
|
|
|
|
|
|
How it works... |
|
|
|
One dual triode does all the work. In receive, one section of the tube is a regenerative detector. The second section is an audio amplifier which provides good volume to crystal earphones. In transmit, one section of the same tube is a crystal oscillator. The second section is a RF amplifier. A neon bulb provides side tone. The only solid state devices are 3 diodes and the transceiver would work without those. In receive, you can tune up or down from your transmit frequency by approximately 25 KHz. Output power is about 200 milliwatts, more or less, and is routed through a harmonic filter. The transceiver is battery powered using one D cell and ten 9-volt batteries. Voltage on the key is a safe 1.5 volts so it won't hurt you or your keyer. Sockets are provided for the crystal leads for easy crystal switching.
When used as a regenerative detector, many tubes are microphonic and the 3A5 used in this transceiver is no exception. It's not much of a problem unless the transceiver is subjected to vibration. This transceiver does re-radiate when in receive mode and in regeneration. This is typical of all regenerative type detectors where no buffer stage is employed between the antenna and detector. The amount of re-radiation is kept to a minimum by a very low amount of coupling between the antenna and the regenerative detector, but it is still possible to cause interference to other receivers operating nearby. Because of the chance of interference, I don't recommend that this transceiver be used at group functions where others are operating nearby. |
|
|
|
Click here to go to the ac power supply page. Pictures of the power supply, a schematic, parts lists and pc board layout are on this page. All parts are available at Mouser Electronics, www.mouser.com. |
|
|
|
View My GuestBook to see what builders have said about my last kit, the Glowbug 40. |
|
|
|
  |
|
|
|
|
|