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| Mhz | Meters |
| 2.30 - 2.55 | 120 |
| 3.15 - 3.45 | 90 |
| 3.85 - 4.05 | 75 |
| 4.70 - 5.15 | 60 |
| 5.75 - 6.30 | 49 |
| 7.10 - 7.40 | 41 |
| 9.40 - 10.05 | 31 |
| 11.50 - 12.20 | 25 |
| 13.50 - 13.90 | 22 |
| 15.10 - 15.70 | 19 |
| 17.40 - 18.00 | 16 |
| 21.30 - 21.95 | 13 |
| 25.60 - 26.10 | 11 |
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If you are buying the receiver for SWL only, go to Instructions for the SWL Version of the Kit. These instructions show how to make the modifications as you build the kit for SWL reception, simplifying the building process. It is not recommended to try frequencies below 4.000 MHz, because of the IF frequencies at 3.547 and 4.000 MHz. Converters should be used to upconvert to some band that is set up on the receiver. The following information shows how to modify a receiver previously built for ham band reception. Four of the most popular SWL bands (41, 31, 19 & 16 meters) are set up using the same "dual image" technique the ham band version uses. |
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The Mixer Injection Level Pot is located at the first VFO amplifier. (Picture) It is a black PC mount 100K potentiometer. A 100K panel mount potentiometer is mounted at the front of the receiver so that the injection level can be easily adjusted. A bypass cap (.01) should be placed on the pot between the ground lead and the Gate 2 lead. The PC mount pot is removed and wires run from the holes to the panel mounted potentiometer. Shielded cable would be best. This pot controls the VFO injection level to the first mixer. The LEDs at the mixer will indicate the VFO injection level by their brightness. Since SWL stations have megawatt outputs the receiver can easily overload. The Mixer Level Injection Pot is used to prevent overload of the receiver. If a popping noise is heard while adjusting the Bandpass potentiometer the injection level needs to be lowered until the popping is gone. Finding the band(s) will be much easier. The popping noise is caused by the megawatt stations overloading the first mixer. Using the same antenna for all the bands will require use of the Mixer Injection Level Pot. The bands that are resonant with the antenna will come blasting into the receiver with a need to lower the injection level. Bands not resonate with the antenna will require more injection level. The Mixer Injection Level Pot varies the gain of the mixer. Higher levels give greater gain but less dynamic range. Lower injection levels will lower the gain and give more dynamic range. Experiments with the prototypes have found that running the LEDs at the mixer where they are just barely lit works best with the bands that come in very strong. With the weaker bands the LEDs are run almost at full brightness. |
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The VFO IR switching needs to be disabled and replaced with two SPST switches. The imaging for the SWL bands does not follow the same combinations as the Ham Band version, so all the switching will be manual. Two miniature SPST switches are mounted between a couple of spaces that are mounted between the VFO board and the Input board. (Picture) One side is connected to 12 Volts at one of the 12 Volt boxes. (Picture) The other side of the switch ties into the ungrounded end of the 100K resistors connected to the gate of the VN0106N3's on the VFO board. (Picture) Heat shrink tubing is used to cover up the lens of the phototransistor and photodiode to disable them. No parts are removed and no traces are modified. The IREDs do not need to be touched. This allows easy selection of the proper VFO with the proper Bandpass filter to receive the SWL bands that will be set up below. |
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31 and 16 MetersThe most popular SWL band is 31 meters. By changing the highest frequency of the VFO to 13.5 MHz, both the 31 meter and 16 meter band can be received. The VFO should tune from 13.5 MHz to 14 MHz. This is a wide bandwidth for the tuning capacitor without a reduction drive, but with AM stations, the tuning will not be as critical as trying to copy CW and SSB. To move the VFO to 13.5 MHz, parallel a 39pf NPO capacitor to the 6.8pf capacitor going from the VFO to the main tuning cap. (Picture) This will enable the 14.068 tuning capacitor to reach 13.460 MHz (approximately), to 13.900 MHz. If the bandwidth is set 13.505 to 14.017 MHz, WWV at 10 MHz can be received. Subtract the 4 MHz crystal filter frequency, and you are receiving the 31 Meter band, 9.500 to 9.980 MHz [13.500 - 4.000 = 9.500]. Add and you will receive the 16 Meter band, 17.500 to 17.900 MHz [13.500 + 4.000 = 17.500]. To receive the 31 Meter band, select the 4.000 MHz Crystal Filter. The Bandpass switch is on the 40/30 filter, and the Bandpass pot is almost mid range. Tuning is very sharp. To receive the 16 Meter band, the Bandpass Switch is on the 20/17 filter. The Bandpass pot is almost all the way to one end (clockwise if wired like the pictures in the instructions). Both LEDs are off at the VFO, indicating that the VFO frequency is running at 13.500 MHz. Both VFO switches are off. 19 Meter BandFirst, remove the 68pf NPO capacitor next to the 10.545 yellow trim cap. (Picture) Setting the second frequency, switched on by the 10.545 relay, to 11.453 MHz will give you the 19 meter band, 15.000 to 15.710 MHz. (11.453 + 3.547 = 15.000 MHz) With the 400kHz bandspread of the main tuning cap, the coverage will be 15.000 to 15.400 MHz. To receive the upper section of the band, select the 4.000 MHz crystal filter. This will give 11.453 + 4.000 = 15.453 MHz to 15.853 MHz (11.453 + 4.000 = 15.453 MHz). This leaves a gap in the middle of the band which is not received, 53 KHz, but if this section is important, the VFO could be lowered in frequency 53 KHz (11.400 MHz) to get that portion of the band using the 4.000 MHz Crystal Filter. To receive the 19 Meter band, select the 3.547 MHz Crystal Filter for the lower portion of the band, or the 4.000 MHz crystal filter for the upper portion of the band. The 10.545 LED is on at the VFO (one VFO switch on, one off), and the Bandpass switch is set to the 20/17 Bandpass Filter. Slight adjustment of the Bandpass pot may be needed when switching between the upper and lower sections of the 19 Meter band. 41 Meter BandIf the third frequency is set to 10.847 MHz, you can receive the 41 meter band. The 10.455 trim cap will reach 10.847 MHz with no changes to the board. (Picture) When setting the VFO, both LEDs at the VFO should be on. The 41 Meter band is 7.100 to 7.500 MHz. The 40 meter amateur radio band is 7.100 to 7.300, which is not covered. The coverage with the receiver for the 41 meter SWL band is 7.300 to 7.600 MHz. Since the 40 Meter ham band ends at 7.300 MHz, setting it up for 7.300 to 7.500 means 7.300 + 3.547 = 10.847 MHz for the VFO frequency. If coverage of the low end of the 41 meter band is desired, solder a 20pf NPO capacitor across the 10.455 yellow trim capacitor (underneath the board), and adjust the VFO to 10.647, which will tune the 41 meter band starting at 7.100 MHz. To receive the 41 Meter band, first select the 3.547 MHz Crystal Filter. Both LEDs on the VFO will be on (Both VFO switches on), and the Bandpass switch is set for the 40/30 Bandpass Filter. The Bandpass pot will be clockwise left of center position. The signals at night will be very strong, so remember, if popping occurs while tuning the Bandpass pot, turn down the VFO Injection level. This, by no means, |