[MRCA] GRA-39 Gilbert Ops Walt Started this

[B. Smith]

          I was impressed and inspired by Walt's GRA-39  setup last 
year, so he gets credit for having the first GRA-39 operation at 
Gilbert. He used one to go from his inside ops to his commo trailer 
outside the building to run a VHF set. (I have his demo on video if I 
can every finish the Gilbert 2013 web pages) I pulled my sets out last 
month (purchased several years ago at Gilbert for $5 bucks a box) and 
did some testing. Bad thing about the operations of each unit  - - the 
remote and the local control require 6 D cells each. I found one really 
corroded battery box but found a replacement on ePay. The sets uses a 
1500 cycle tone for control so a "direct pair" line is not necessary.

During my testing I found that each unit can easily run off of a small 9 
volt battery, current draw on the 2329 Local Control  was nil on receive 
and 20-25 ma on transmit (relay closes), so that 9 volt battery should 
last quite a while. On the  2328 Remote the current draw is a little 
higher, 10 ma on receiver and approx 30 ma on transmit.  Both sets have 
On and Off switches to conserve power, the manual ringer/buzzer still 
works without power to alert the operator to turn his set on.

A couple things I would like to try is see if you can parallel two Local 
Control units.  In addition I would like to try the wiring interface 
between the GRA-39 Remove Control and the SB-22 and use the switchboard 
to connect the system to different "subscribers" (that's teleco talk) .  
And to use the set for HF ops. See diagram below.

Speaking of batteries, I need to hit the local dollar store and scoff up 
a supply of cheep D cells for all the phones etc.     :-)

GRA-39 to SB-22 diagram below.

Z





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