KL7UW

HF TOPICS



  February, 2016

New HF/6m amplifier bought in Jan. 2016: Elecraft KXPA-100.
Sold Mirage A 1015G 6m amplifier, and will sell CCI amplifiers: AN762 and EB27A.

  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
Update for FEB. - 2012 The Elecraft K3/10 12w HF transceiver has replaced the FT-847 on HF bands. A CCI 300w HF solid-state linear amplifier kit has been built. It runs up to 270w with the drive available from the K3/10. Photos from assembling the K3 kit: Main RF board Rear Panel Bottom of main board Aux Rx board K3 installed Views from 2009:
I operate using either an 80-40m inverted-V dipole or the TH3-mk4 Tri-band yagi (20/17/15/12/10m 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. A 30m sloper diplole will be added in 2015. I occasionally operate on 14.070 PSK-31 and sometimes check into the 14.303.5 Elecraft Net at 1600 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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