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[VHFcontesting] Flex 1500 PTT Output Keying

To: "VHF Contesting Reflector" <vhfcontesting@contesting.com>, <vhf@w6yx.stanford.edu>
Subject: [VHFcontesting] Flex 1500 PTT Output Keying
From: "Les Rayburn" <les@highnoonfilm.com>
Reply-to: Les Rayburn <les@highnoonfilm.com>
Date: Fri, 31 Dec 2010 02:51:22 -0600
List-post: <vhfcontesting@contesting.com">mailto:vhfcontesting@contesting.com>
My lovely XYL Abby presented me with a brand new FlexRadio 1500 as a Christmas 
present this year. I’ve enjoyed playing with it over the past days, and have 
been amazed at what a difference it makes to to be able to “see” weak DX 
stations. Should be a blast to operate. 

My primary intention for the rig is to use it as my primary 6 Meter radio, 
driving a 150 watt amplifier, and also as my primary IF rig, driving my three 
transverters. All of those are DEMI transverters with simple RCA type PTT 
switching. It looks like I’ll need to construct a FlexWire V2 DB9 connector to 
the rig, and use PIN 3 (PTT OUTPUT) and PIN 1 (GROUND) connected to an RCA male 
plug. My questions are this: 

1.) Do I need to connect a diode (as suggested for relay closures) on this 
cable? If so, where should I place it? 

2.) Any other caveats before I proceed with this experiment? 

I’m also interested in hearing from others who’ve used the Flex 1500 for VHF 
work, and your general opinions on it. It seems a fine performer on HF. A bit 
sensitive to MW broadcast overload perhaps, but other than that, an amazing 
receiver. Can’t wait to try out the transmit functions now. 

BTW, Happy New Year to all the VHF Men out there. I’m hoping 2011 will be the 
year that I complete 2 Meter VUCC (98 grids worked so far) and make a good 
start on 222 and 432 as well. Listen for the weak (indoor) ones! 


Les Rayburn, N1LF

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