Re: [TenTec] OT: Holiday SDR Project

[Carl Moreschi <n4py3@earthlink.net>]

If you energize the relay with the amp key line, it will energize before 
RF is generated.
Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com

On 11/9/2014 1:44 PM, George Fritkin via TenTec wrote:
> Yes, and if the relay is not fast enough, you will TX RF right into the 
> receiver.  It may be momentary, but still potentially dangerous.  The DX 
> Engineering RTR does not have the problem
>
> George, W6GR
>
> Sent from my iPad
>
> > On Nov 9, 2014, at 10:29 AM, Don Rasmussen via TenTec<tentec@contesting.com>  
> > wrote:
> >
> > Carl, Is there a document for the mod anywhere? Photo, etc.
> >
> > =================================================
> >
> > The MFJ 1708 schematic shows the relay in the transmit position which is 
> > contrary to what it says in the diagram. Without the jumper, in receive only 
> > the panadapter receiver would be connected to the antenna, not the transceiver. 
> > Adding the jumper between the antenna and transceiver causes the transceiver to 
> > be always connected to the antenna which is exactly what you want. In transmit, 
> > the relay still grounds the panadapter antenna and removes it from the antenna 
> > which again is exactly what you want.
> >
> > Carl Moreschi N4PY
> > 58 Hogwood Rd
> > Louisburg, NC 27549
> > www.n4py.com
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