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K5WHR USA flag USA

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Want more TX audio from your IC-718? Look below...

Single story apartment

Radio 1 : Icom IC-718

Radio 2 : RCI-2950DX (Green display) 21 - 29.7 MHz (Did the 15M mod myself and completely realigned the whole radio) with PL tone encoder board for repeater access  Sold 7/28/2014

Headset : Heil Proset IC

Tuner : MFJ-901B 200W tuner

Antennas: Ground mounted vertical.Tunes & works 80M - 10M. Antenna is 14-16 feet with ground screen. Indoor 160M-10M wire experimental antenna with vertical polarization.

Software: DXLabs suite for logging and DX spotting, JT-Alert & WSJT-X for JT65 and JT9

Digital modes: PSK-31 (20-60 watts) 80M-10M, JT65 (10-40 watts) 80M-10M, SignaLink USB interface

JT9 (15 watts) 20M just started using this mode 4/28/2013, use WSJT-X for this mode along side (JT-Alert forWSJT-X)

See where your digital signal is being heard http://www.pskreporter.info

Interresting reading

Antenna Height and. Communications Effectiveness

RFI Tips and Tricks

RFI PDF

Eliminating RF feedback

http://www.w8ji.com/

Antenna Construction

 

Station setup

 

Center loaded vertical (better efficiency than base loading) 14' 80-10M with capacitance hat, helps distribute RF current along more antenna. Still a compromise antenna but works better than nothing. The center loading coil is used to resonate the antenna on 10M - 80M. It is a home made coil made of 50' #12 AWG copper wire round 4.5" OD 5" length. The ground plane is aluminum screen and 2 wire radials. The coax choke sitting on the ground keeps the RF at the antenna and not on the coax. All PVC is SCH 40 1" tube. Everything to make this antenna was purchased from LOWES except the coax and the SO-239. The wire is 16 AWG. The antenna has worked across the US on 80M JT-65 and into Europe on 40M. The small rod mounted half way is switched in to match the antenna on the higher bands.

 

The antenna in action on 80M JT65 running 50 watts

 

Icom IC-718 TX audio mod, resistor value to be replaced is very close to the value used in the IC-756PROIII mic amp circuit giving it more gain. The capacitor in parallel with R2211 in the IC-756PROIII mic amp circuit is a 100pF and not a 470pF as in the IC-718. May have slightly different TX audio characteristics than the 756PROIII if not changed. Schematic below is from the IC-718 service manual which can be downloaded by googling it.

This mod will give you all the modulation you need to kickup a little better average SSB signal on TX.

The surface mount resistor to be completely removed. Not an easy task. 1/4 W resistors shown for size comparison.

Other audio improvements: Icom HM-36 Chinese made microphone mods -->http://n9ewo.angelfire.com/misc.html

 

Homemade loading coils - Same coil used on antenna above

 

 

 

1139280 Last modified: 2014-07-30 02:19:13, 5979 bytes

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