Helical Resonator Preamps
Pre^mps with 3 or 4 sea ion hejical reson^rors reduce intermod & cross-band interference in cuiicaL applications MODEL HRA-n, S49 vhf. S94 uhf *Specify Tuning range U2-1S0. 150-162, U 213-233, J TO^SSD, 4*^4/0.
Low noise convefters to receive vhf and uhf bands on a TOM receiver Chc&e of kit w^th case & BNC peks kit with peb oniy, 0* w/l uni: in a case Other modeis avail a bio far other in/o^rt ranges & atv Request catalog for compfote listings. VHF Input ranges avail: 136-138, 144-146, 145 f47. 14&^1481 ?20-222, 222 224, kit less case $39, kit w/case $53 /,-t ^ ease S8S UHF input ranges avaiJ: 432-434. 435-437. krt less case $49, fcjt leasts SG9, wA in case $99. 902-976 MHz corwerts down to -122-448 or 430 4 50 range. Same price as uhf transmitting converters
XV2 tor vhf and XV4 for uhf. Models tu convert 10M ssb, cw, frn, etc to 6M, 2M, 220, 432. 435, and for atv 1W ouipuL Kit only S73. PA s up to 45W available fi&^uesr catalog tor complete listings.
high performance xmtrs & rcvrs for repeaters, af & digital links, telemetry, etc.
FM EXCfTERS; k-ts $39. w/l $ 169 2W continuous duty TCXO 4 xtal ovon options available*. FCC type accepted for com'I uhf & hi bands * TA51 for iQf^. 6M. 2M, 150-174. 220MHz
- VHF & UHF AMPLIFIERS. For 1 rrt+ ssb. atv. Output
W Sever from 10W to 10C5W
af mociets ^rts startjrig al $79
FM RECEiVERS: krts $139. wft$189
^ R144. R220 FM RECEIVERS for 2M, 150-1 7a, or 220MHz. GaAsFETfront end, 0.15uV sensrdvrtyl Botti crystal £ ceramic if fitiers plus helical resonator front end for exceptional selectivity >l0GdB at +12kHz [best a.ajlabte a'-ywhefe1} Flutter-proof hysteresjs squeich. aic tracks drift
- R451 UHF FM RCVR, suniiaf to above
Triple-conversion. GaAs FET from end.
- R76 ECONOMY FM RCVR for 10M, GMr 2M, 220MHz, wfo helical res or afc }Qts$1Z9
- Weather satellite i AM aircraft revrs also avaiable
1/4 irave spacmg from tamer
1/4 irave spacmg from tamer
spacing from foiwf
- 3üCñ
spacing from foiwf rqo mot^fM fa/r^f pa/îernj
Fr^wr*' ó, ííJ /«ï/r/'rn.v^r ó dB antenna; b) Azi muí h patterns for 6 dB antenna.
over the end of the feedline so that the ir' length of braid can be placed over the bottom of the tulx_\ Solder the feed line braid to the bottom of the brass tube.
Step 9, Next, make a true 14-wave (no velocity factor correction) long decoupling sleeve out of a Vi ' diameter brass tube. Using some of the excess shield material, solder the decoupling sleeve to the feedline outer conductor at a point exactly U-wavelength down from the point where the feedline attaches to the antenna. See Figure4.
Step 10. Attach the exposed end of the feedline to llie bottom ol ihe col linear (center conductor of feedline to outer conductor of the antenna).
Step 11. Make at least 3 stvrofoam spacers to slip over some of the antenna elements. Cut the spacers for a diameter slightly less than the inside diameter of the radome pipe. Space them out to evenly suppon the antenna when you place it in the fiberglass (or PVC) radome cover. The spacers should be attached to the midpoint of the element with a small amount ofepoxy See Figure 5,
Step 12. Cut a piece of fiberglass pipe (or PVC) so that 18 inches or more extend past the top ol the whip and below the decoupling sleeve. Slide the antenna carefully into the fiberglass pipe and cap off the top of the pole. Drill two holes near the bottom of the radome pipe and pass an insulated wire through and around the feedline (below the decoupling sleeve). Twist the wire unlit it holds the feed-line tightly against the radome cover. Place another styrafoam spacer on the very end of the pipe and glue it in place. Make Mire to poke a few small holes or notches in the spacer to allow the end oil the antenna to breathe. You're now ready to fire up your col linear' See Figure 7. ¡Ed. A ote: You can obtain economical fiberglass tubes custom made to your dimensions from: Lightning Bolt Antennas, RD #2, Route 19, Volant PA 16156. Telephone /-412-530-7396}.
Tune Up and Operation
Find a clear area, free of obstructions, in
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