[Elecraft] RX antenna & carrier-operated relay

[David Olean]

Hello Fabio

     I have two beverages  that are somewhat close to my TX antenna. One 
had about 75 mw on it during TX while beverage #2 had about 1 watt! This 
is enough power to cause damage to preamps, so I made two power limiters 
and now the inputs are clipped at about 0 dBm. All it took was two 
transformers and two diodes in a box. Do you know what the power level 
is on your beverage during transmit periods?  Really high power levels 
could burn up the transformers.  Disconnecting the antenna is a good 
idea too.

Dave K1WHS


On 3/4/2017 9:53 AM, Fabio IZ4AFW / NZ1W wrote:
> Hi guys,
>     I was thinking of a possible firmware improvement related to the
> carrier operated relay.
> I use my radio on a small lot and recently I added a short beverage
> antenna for low-bands receiving. My main activity is single-op contesting.
> Because of the interaction between the tx antennas and the beverage, on
> some bands I have the COR (carrier operated relay) activating when I use
> high power.
> I know the good solutions, but my point is different.
> As I have the COR activating only when the RX Ant input is selected, why
> doesn't the K3 firmware disable it when pushing the ptt?
>
> In fact, when I push the ptt I don't need the RX-ant part to be active,
> as I'm transmitting, and -at least in my setup- I have no other
> rigs/devices that need that input (I mean, no in-band receivers and so on).
> Instead of using external relays (ptt-activated) that cut out the rx
> input when I am transmitting, why the K3 firmware just doesn't disable
> the RX ant input on its own (and re-enables it if needed when releasing
> the ptt)?
> Maybe I'm missing something here, or that could be a nice improvement
> for a next firmware release.
>
> Thanks for any comment,
> Ciao 73
>   Fabio
>   IZ4AFW / IO4W / NZ1W
>
>
> ---
> Questa e-mail è stata controllata per individuare virus con Avast antivirus.
> https://www.avast.com/antivirus
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to k1whs at metrocast.net
>