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K5WDW USA flag USA

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QSL: DIRECT, LOTW OR EQSL

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Ham Member Lookups: 14231

   

All QSL requests honored. Send direct with SASE or via bureau.

Certificates held: DXCC, WAS, WAC, WAZ, WPX

Memberships: American Radio Relay League (#2000337110), Collins Collectors Association (#AC08-12133),

Quarter Century Wireless Association (#35791)

QTHs: Houston (K5WDW), Hilton Head Island (K5WDW/4) or Zurich (remote as HB9/K5WDW)


Biographical data:

Educated at the University of Texas in Austin, Texas; graduated with BS in Chemical Engineering & PhD in Inorganic Chemistry.

Pursued postgraduate research in Inorganic Chemistry at the University of Illinois and in Chemical Engineering at Texas A&M University.

Worked 31 years in Research and Development at the Dow Chemical Company, retiring in 2001 as a research manager in Polyethylene Research.

Studied and passed Series 7 and Series 66 licenses given by FINRA in 2002.

Have worked 10 years as a financial advisor, first at A. G. Edwards & Sons then at Merrill Lynch, Pierce, Fenner & Smith.

Present position is Vice President of Investments at Merrill Lynch, Senior Financial Advisor.

Amateur history:

I was originally licensed as a Novice class operator (WN5AKK) in the summer of 1962 while in college. The Novice license expired in 1963 but I became relicensed in May of 2007 after completing an exam for Technician class (KE5OQV).

The license was upgraded via exam to General class (KE5OQV) in June of 2007 and immediately exchanged for a vanity call sign (K5WDW). The General class license was upgraded via exam to Extra class in July of 2007.

Equipment Used:

The units shown in the photos below are my personal Collins S-Line collection. Both Round Emblem and Winged Emblem type units are represented. Also represented in the collection are different types of microphones as well as various accessories such as dummy loads, novice adaptors and noise blankers (both WE and RE). The collection has been maintained in excellent cosmetic, electrical and mechanical condition thanks to the efforts of Dutch Maurer, WB7DYW, now a silent key.





32S-1, 32S-2, 32S-3, 32S-3 and 32S-3A Transmitters ( on left side of shelf)
75S-1, 75S-2, 75S-3, 75S-3B and 75S-3C Receivers (on right side of shelf)




312B-5, 399C-1, 312B-4 (Top)
62S-1 and KWM-2
75S-3A and KWM-2A
75S-3B and 75S-3C
30L-1 and KWM-2

 



SM-2, SM-3, SM-3, SM-3, SM-3 and SM-2
302C-3, MM-1, SM-1, DL-1, SM-1, MM-1 and 302C-3
51S-1, 312B-3, 312B-5 and KWM-2

 

RE 180S-1 Antenna Tuner

 

RE 30S-1 Linear amplifier

 

 

WE 30S-1 Linear amplifier and RE PM-2 power suply

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The Collins station in Houston, TX consists of a KWM-2A transceiver, 75S-3C receiver, 30S-1 linear amplifier, 312B-4 control station, SB-610C-3 scope, 516F-2 power supply and an ElectroVoice Model 664 microphone. The scope and receiver are from the estate of WB7DYW.   The RF signal is monitored by a WaveNode RF sensor and adjusted for SWR by a PalStar tuner before going outside to the antenna, a Mosley MP-33.

Operating position at Houston, TX QTH.


The antenna at Houston, TX, a Mosley MP-33-N Trapmaster HF beam, is mounted on the roof using a GlenMartin RT-424 tower. The rotator is a Hy-gain AR-40. The mast is composed of two telescoping 5' sections of aluminum alloy tubing, held in place with stainless steel bolts..

The height of the Mosley antenna above ground is ~40 feet. The antenna is very efficient with a forward gain ranging from 6 to 8 db, a front/back gain averaging 20 db, and a SWR ranging from 1.08 to 1.85 throughout the 10m, 15m and 20m bands. The maximum power output permitted is 2500 watts PEP on all bands; using the Collins 30S-1, the power output averages 1200 to 1500 watts PEP.

 

Mosley MP-33 Yagi beam

 




Close up view of Mosley MP-33 Beam.  

 

 

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The Ham Shack on Hilton Head Island overlooks Port Royal Sound. 

View of Port Royal sound and the beach in front of the house on Hilton Head Island.  The ham shack and loop antenna look NE toward Europe.

 

Closeup of operating position at Hilton Head showing the Collins S-Line (KWM-2 Transceiver, 312B-5 VFO, 312B-3 Speaker, 516F-2 Power Supply and 30L-1 Linear Amp with a SM-3 desk microphone.  Next to the desk is the 30S-1 Linear). Power output and SWR are continously monitored by a WaveNode system.   Signal quality is monitored by the Heathkit SB-614 hamscope.




Top Row -  312B-4,  312B-4                312B-4,  399C-1 
2nd Row -  32S-3,  75S-3B                    32S-3,  75S-3B
3rd Row -  51S-1,  55G-1                       75S-3C,  KWM-2A
4th Row -  51S-1,  55G-1     312B-3      75S-3C,  32S-3A
5th Row -  30L-1                                          516F-2

 

 

Low loss 52 ohm coax from DX Engineering is used to transmit the RF signal from inside the shack to the Delta Loop antenna. The wires from the Delta Loop terminate at a 4:1 Balun.   A set of bungee cords attached to a dipole fixture provides flex to the antenna system. 

The Delta Loop antanna (or more correctly, a pentagonal loop) was designed using the EZNEC modeling software.  The final model called for 141 feet of #14 stranded wire configured as a horizontal loop.

 

(The photo is outlined in black ink so as to better visualize the arrangement of the wire).

The Delta Loop antenna is suspended parallel to the ground using the existing trees on the lot.  It's approximately 30 yards from the water and stands 35 feet above sea level.  It resonates at 10, 15, 20 and 40 meters with an SWR of less than 1.5:1 on all bands.  

.


This plot shows the measured SWR versus frequency for the Delta Loop antenna.  It was produced by an AIM 4198 instrument from Array Solutions.   The colored stripes in the plot represent the range of frequencies for the HF ham bands 

 

 

 

 

 

 

 

 

1104576 Last modified: 2014-07-15 12:46:29, 8460 bytes

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