June 26, 2021
I have ordered a 1200w HF/6m LDMOS amplifier from W6PQL. It will replace the 6m Harris amp.
Details (webpage under construction)
December, 2019
In 2016 removed 11-element 2m beam from HF tower; Now installed with its twin on the 6m tower.
Discontinued use of 432 yagi on HF tower (high SWR).
HF tower now has just HF triband beam and dual yagis for 222-MHz, plus a 3-element yagi side-mounted
facing SE toward West Coast of US.
New HF/6m amplifier bought in Jan. 2016: Elecraft KXPA-100.
Sold Mirage A 1015G 6m amplifier.
December, 2013
From right to left: 50-foot eme tower, 50-foot HF/VHF tower, New 20-foot 6m tower Close-up of 6m and HF towers
August, 2013
view of new 11-element 2m yagi on ten-foot crossboom at 45-feet
view from tower top looking toward Anchorage
view from tower top overlooking Cabin Lake
Update for July 8, 2013
Comparison of K3 and KX3 receiver performance on 6m & 10m:
Test set up: XG3 + JFW 30-dB step attenuator + 6-inch of RG-58 w/BNC's.
The XG3 is installed in a Hammond "diecast aluminum" enclosure with BNC feedthru adapter
so the unit is fully shielded.
I have made MDS measurements using additional 20-dB coaxial attenuator to -157 dBm +/- 2 db,
but that was using double-shielded coax whereas today's tests were using ordinary RG-58
(so this adds a little uncertainty on the minimum signal).
MDS detector are my "ears" so that makes it a bit more subjective for absolute measurements (but
realistic since this is what is used to make contacts).
Both radios tuned with 2.8 KHz bw in USB, Elecraft's MDS spec is done at bw = 500-Hz.
PRE indicates internal preamp in either radio. ARR refers to the ARR P50VDG preamp.
| 50.120 MHz | ||||
|---|---|---|---|---|
| LEVEL(dBm) | K3+ARR PRE | K3+PRE | K3 PRE=OFF | KX3+PRE(30-dB) |
| XG3 OFF | S3 | S1 | S0 | S0 |
| -73 | - | S9+5 | S8 | S9 |
| -107 | - | S3 | S1 | S4 |
| -127 | - | S1/S2 | NONE | S1 |
| -130 | - | S1 | NONE | NONE |
| -137 | S3 | NONE | NONE | NONE |
| ANT NOISE | S4/5 | S2 | S0 | S2/S3 |
| 28.200 MHz | |||
|---|---|---|---|
| LEVEL(dBm) | K3+PRE | --------NA-------- | KX3+PRE(30-dB) |
| XG3 OFF | S1 | NA | S0 |
| -73 | S9+5 | NA | S9 |
| -107 | S4 | NA | S2 |
| -123 | S2 | NA | S0 |
| -130 | S1/s2 | NA | NONE |
| -133 | S1 | NA | NONE |
I operate using either an 80-40m inverted-V dipole or the TH3-mk4 Tri-band yagi (20/15//10m and 17m by use of a tuner). On November 25, 2008 the second 50-foot Tower was raised supporting my Tri-band yagi and the 80-40m inverted vee dipole. I occasionally operate on 14.070 PSK-31 and sometimes check into the 14.303.5 Elecraft Net at 1800 utc on Sundays. I've added FLdigi software to support keyboard-CW and several digital modes. The layout of the two 50-foot towers are well situated to support a 122 foot horizontal wire at 40-50 feet above ground. This has been installed as an inverted-L: 43 feet high by 122-feet long (see 600 meter page). I do not participate in sending QSL's for HF contacts unless requested (please send sase). I do honor 6m QSL's and all eme initial contacts. I only send paper QSL's and do not do e-QSL or LOTW. Go to the link to KL7J's HF Propagation page.
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