Frequency Hopping Spread Spectrum

[John Teller]

I still have the Icom IC2 used in those experiments.  It is modified 
with a DIP socket to allow access to the lines from the thumb switches.  
I think it is starting to suffer from capacitor dry-out, but it still 
works. I'm kind of hesitant to open it up for repair, due to its 
historic nature!

---JST


On 12/28/2013 06:07 PM, Andre Kesteloot wrote:
>
>>
>> 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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