[GreenKeys] Looking for VFO (1.5-2.0 Mc range) with FSK

[wa3frp at aol.com]

Hi Roy!



Thanks for your email and for your thoughts.



The exciter in the Collins T-440/FRT-24 works as a frequency doubler on 80M and 40M.  It further multiplies as the frequency increases.  



The current VFO has a frequency range that starts at 2.0 and goes up to 4.5 Mc  That is fine for every ham band except 80M 



If I can find a FSK Keyer that has an output at 1.75 Mc then I am fine.  80M RTTY is generally between 3.7 and 3.6 with some countries like Japan operating between 3.52 and 3.53 Mc



I suppose that I can modify and effectively eliminate the Collins doubler circuit but that means I'll also affect 40M operation. 



Thanks again,

Russ WA3FRP 


-----Original Message-----
From: Roy Morgan <k1lky at earthlink.net>
To: wa3frp at aol.com
Cc: greenkeys at mailman.qth.net
Sent: Wed, Oct 14, 2009 11:36 pm
Subject: Re: [GreenKeys] Looking for VFO (1.5-2.0 Mc range) with FSK



On Oct 14, 2009, at 3:07 PM, wa3frp at aol.com wrote: 
 
> 
> Hi Guys, 
> 
> Turning to Greenkeys for ideas. My vintage (1959) TX is designed to > operate 3 to 30 Mc but is mainly crystal operated. The current VFO > will run the TX on 40M and up. 
> 
> But I would like to work some 80M RTTY this winter since the > sunspots are still low. 
... 
> What I would like to find is a VFO with an output that covers 1.5 to > 2 Mc. 
 
Russ, 
 
If you can find a Northern Radio Company Type 105 F.S. Keyer, it would do well for you. However, it's normal output is from 2 to 4 mc, and it multiplies up to 32 mc, i am pretty sure. I seem to remember noticing that they will tune from about 1.8 mc up. Just why you need 1.5 mc is not clear to me. 
 
To be frequency agile, then need an external oscillator, from 2 to 4 mc. They have space for three crystals for fixed frequency operation. 
 
In 2005, I emailed with fellow in CA who had two of the Type 105's (and needed a manual). His email then was boatanchor at martasystems.com and he was on this list. I have no idea if he'd let one of his go. But be advised these things are HEAVY, and they need a separate power supply. 
 
TMC also made an rf-output FSK keyer. They are harder to find, though. 
 
Roy 
 
Roy Morgan 
k1lky at earthlink.net 
529 Cobb St. 
Groton NY, 13073 
Home: 607-898-3607 
Cell: 301-928-7794 
 
 

=