Since discovering the AM activity on 3870 back in 1996, it has been my pleasure to be involved with some of the finest and most interesting hams in our hobby.   The site isn't just about me. It's also about the other hams on 3870 AM and our activities as reflected on many of the following pages.
    Hover mouse over any picture in a photo album to read the caption or click on a photo to open a slide show with large pictures for easier viewing.
                                
Contact: w7jhs@embarqmail.com               Updated:  July 26, 2010

Latest Updates:    

Updated photos of the W7JHS Portable operation at the Prosser Aerodrome
Great article on versions of the 6146 and their application
Bill, W0WI, mobile operating position - 3 photos posted 7/13/10
W6SGJ, Dick in Vancouver, WA operating Field Day
KE7GPO BC-610 Project page - 3 new photos on air posted 6/28/10
Official 3870 Roster as of June 2010

                       
                         W7JHS Operating Position   
                                                                     


   The main operating position as of March 14, 2009.  The set up includes 9 receivers and 8 transmitters for AM operation, switchable in any of 72 combinations.
    On the left is the Heathkit Mohican (not on line), Echophone EC-1 and the Echophone EC-2.  Centerpiece transmitters include the Viking Valiant and Globe Champion 300.  The Class D, K7DYY Junior and Senior transmitters, along with the K7DYY 100th Exhibitor are on the middle shelf below the rig switching system.  The HQ-140X is shown beside the Globe Champ.
    To the left of the Globe Champ is the CW setup, an Elecraft K-1 QRP transceiver and the Icom 706 MkIIG.



    Moving to the right side of the operating position we see the Echophone EC-3 with the Viking II CDC transmitter.  Just below is the National HRO-7 with matching speaker and doghouse power supply.
    On the bottom shelf is the Harvey-Wells Bandmaster TBS-50C and its original power supply which can be used barefoot or driving the LFE amplifier.  Also on the bottom shelf is the BC-614E speech amplifier for the BC-610.



    Shown in the left rack is the K7LFE, Little Faint Echo Laboratories Model 8 linear amp with a pair of 813's in grounded-grid.  Packaged in a homebrew wooden rack, the amp runs around 1KW PEP on SSB and 350 watts of carrier on AM.  Also shown are the SB-610 and Beckman monitor scopes and the 2600 volt power supply for the linear.
   The wooden receiver rack houses the SX-111, R-390A, SX-101A and the BC-342N.  The BC-610 with outboard modulation reactor rounds out the lineup.

                                     K7DYY Rigs



    Designed and built by Bruce, K7DYY, here are the two Class D transmitters.  The green one is Serial #1 of the K7DYY Junior models.  Completely self-contained and power from the 120vac, it conservatively runs at 160 watts of carrier.  The larger one, the K7DYY Senior, runs 350 watts of carrier and both use the DYY processed D-104 microphone.  Next to them is the DYY 100th Exhibitor which displays plate color with about 865 volts at 120ma. For more on the K7DYY Senior rig, checkout Bruce's website - www.k7dyy.com.