[TenTec] OT: Holiday SDR Project

[Carl Moreschi]

What radio are you using?  Many radios have an easy way to share 
antennas.  If that's not an easy solution then the MFJ1708 can do the 
job.  See below.

The solution to share antennas is to add an MFJ-1708 T/R switch.  This

unit will automatically sense RF from the transmitter and then remove

the panadapter radio from the receive antenna connection.  But the MFJ

switch will also remove the transceiver from the transmit connection

while in receive.  So the MFJ switch needs a very simple mod.  You

must solder a 14 gauge wire between the transmit and antenna SO-239

connections.  This will then make the switch operate properly for this

use.  Additionally, you can wire the relay to energize from your

radio's amp key line for faster and safer switching.



Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com

On 11/7/2014 5:45 PM, Don Rasmussen via TenTec wrote:
>
>
> That sounds great Carl, the transceiver and SDR can both be tuned by the main tuning knob of the transceiver.
>
> Anyone have suggestions on sharing the antenna?
>
> The second receiver needs to have it's input grounded before the transceiver puts RF on the line.
>
> =======================================================
>
> That will work well for you. My N4PY software can provide everything you need to keep the softrock and your transceiver on the same frequency.
> Carl Moreschi N4PY
> 58 Hogwood Rd
> Louisburg, NC 27549
> www.n4py.com On 11/5/2014 11:34 AM, Don Rasmussen via TenTec wrote:
> After all this talk about the new Flex Series and peripherals it seems all of
> my objections have melted away except for the oldest one - cost! Flex 6300 with
> FX-PAD and TMate2 are outside of my ham radio budget but only because I have
> that amount of money tied up in existing gear that I enjoy. I did decide to take a look at what Tony Parks has been up to and found a very
> inexpensive SDR project for the holidays. I can enjoy the build and then mess
> with the software. The 1.8-30Mhz receiver is $68 and the option cabinet is $20. http://tinyurl.com/qx4ha8p
>>
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>