Portable Dipole Shortwave Antenna (PDSA-7)

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1 PACKING LIST 1 Connection base 1 (Material: Nylon) 2 Multiband loading coil 2 (40m-10m, material: Nylon) 3 Aluminum oxide tube 4 (19 X 280mm) 4 Extractable antenna (on the top) 2 (Each fully extracted 2.5m) 5 Plastic head screw 2 6 Aluminum connector 2 (used for setting in V-shape) 7 Balun 1 8 Aluminum converter 1 (used for connecting tripod) 9 Screw clip (with knurled nut) 2 10 Fabric bag 1 Note. 1. Coaxial cable is not included. 2. Brace rod (not included) is needed while setting

2 FEATURES 1. Small size, light weight and convenient to handle. 2. Easy and quick to set up, suitable for field or travel use. 3. Handle convenient for operating at different waveband 4. Coil frameworks made with nylon by open mold, not lathe production manually. Coil winding with 1.0 mm tin plated copper wire. 5. Aluminum tube sand blasting and oxidation. 6. Stainless steel screws 7. Stainless steel whip antenna, length up to 2.5m. 8. Can be constructed in different shape. SPECIFICATIONS 1. Max Power: 100W 2. Impedance: 50 Ohm 3. Band: 40m/30m/20m/17m/15m/12m/10m/6m/2m (7-50MHz) 4. Whip antenna contraction length: 34.5cm 5. Unfold/Erection length: 6.7m 6. Weight: 1.8Kg 7. Bag dimension: 37*23cm ASSEMBLY NOTES The type of antenna to be constructed is chosen. This could be a dipole, vertical, or other configuration. We take dipole type as example. 1. The assembly order is, Connection base > 2 aluminum oxide tube > 4 aluminum pipe >Loading coil >Whip antenna.

3 2. Small coil screw clip is used to hook one of the turns of wire on the coil. The hook extends below a hollow threaded rod that accepts a plastic knurled nut. To tap a coil, loosen the plastic nut on the coil clip until it is very near the end of its travel, or remove the nut completely. Carefully insert the hook into the turns of wire such that the blade of the hook is away from the whip (as shown). 3. Coils are tapped at the appropriate place and make sure that screw clip is not too firmly screwed, as the coil is winded by tin plated wire, which makes the coil easy to get deformed. 4. Keep opening side of the screw clip to the whip antenna. When screw clip is not needed (such as at 40m band), it is better to be taken off to prevent shorting. 5. Do not coil the coaxial cable (not included in the packing list) but keep it open, otherwise it will affect SWR adjustment. 6. Whips are extended to their desired length and can check regulating parameters for reference.. 7. The type of antenna to be constructed as below shape.

4

5 8. If you prefer to constructing the antenna in GP shape, you can order an earth anchor and an earth flat cable (Please contact us for details), then you have a new set of exquisite antenna as PMSA-12. The connection base of JPC-7 can be used as below, REGULATING PARAMETERS (only for reference) RED Coil BLACK Coil Band Coil Whip Antenna Coil (Turns) Coil Whip Antenna Coil (Turns) (Section) (Section) 40m YES 10 5 th turn, from aluminum tube side YES th turn, from aluminum tube side 30m 20m YES 10 5 th turn, from whip YES 10 sections -8cm 11 th turn, from whip 17m 15m YES 10 3 rd turn, from whip YES 9 sections +11cm 3 rd turn, from whip 12m 10m NO 10 NO 10 sections -7cm 6m Whip antenna only on each side, about 4.5 sections 2m 2 aluminum tube + 1 section whip antenna Note. is rarely used band and parameters have not been tested presently.

6 NOTES ON ADJUSTING SWR If aerial analyzer is available, try to find the lowest SWR value and check resonant frequency. If resonant frequency is high, it shows the antenna is short and needs to lengthen the whip antenna or increase the loading coil circles, not vice versa. The advice is to adjust the coil and whip antenna first and not the aluminum tube on each side. If aerial analyzer is not available, standing-wave meter on the transceiver also can do this. Set transceiver at FM, AM or RTTY mode, decrease the transmit power at about 10W, press down TX key and adjust the frequency to look for the lowest SWR value at different bands to check resonant frequency. Then adjust according to step 1. (The end)

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