Frequency Hopping Spread Spectrum

[wb4jfi at knology.net]

Everything that is old is new again....

I believe that most non-professional spread spectrum aficionados generally use the term “spread spectrum” to discuss both frequency hopping (FHSS) and direct sequence (DSSS) spread spectrum.  Some purists don’t necessarily agree with this, but I’m not pure in any aspect.  Hop bunny, hop!

I still have my Icom IC-2N HT that was modified to hop the two-meter band.  I’m not sure I can find the program on my IMSAI CP/M computer to drive it, however.
73, Terry, WB4JFI


From: Andre Kesteloot 
Sent: Saturday, December 28, 2013 6:07 PM
To: tacos at amrad.org 
Subject: Re: Frequency Hopping Spread Spectrum




  On 12/28/13 4:27 PM, James Wolf wrote: 

    Frank, 

    FH is only what it says it is, it does not refer to or define a waveform, 
    however a waveform may define FH.  SS would be complimentary to FH and is 
    used in 802.11x waveforms as well.  The early frequency hopping HaveQuick 
    radios were analog, hopped very slowly and you lost the audio in the dwell 
    time when switching to a new frequency, so there were dropouts every time it 
    changed frequencies.  

James,

If you refer to the ARRL Spread-Spectrum Sourcebook (downloadable free in PDF format from the AMRAD Web-site), you will see the description of an early FH system that ws created by Terry Fox WB4JFI.  
Chuck Phillips N4EZV(SK) and I then developed and operated a FH beacon in the 2-meter band.
Another beacon was put in operation in Vienna VA and was built by Dave Borden K8MMO(SK), Terry Fox WB4JFI, Elton Sanders WB5MMB, Hal Feinstein WB3KDU and Bernie
Stuecker K4XY.
In late 1981, N4EZV and I demonstrated a FH system based on modified Heathkits, hopping, as I recall, at about 90 hops per second.

What we are doing now ( WB3KDU, AA4HS, myself and a few others) is  just a continuation, but with better gear  :-)

73,
André N4ICK



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