[K3] max input voltage on Ant 1 or 2

[M0XDF]

I can't find this in the spec although I expect its there
what is the max input voltage on Ant 1 & 2?
I have a ref osc that gives 5MHz at ~ 5mV, I'd like to use this to do  
a ref cal by direct connection to ant 1 or 2
--
In theory, there is no difference between theory and practice,
but in practice there is.

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[Brett Howard]

I had a gen that would give me 1mV and I found that it produced a signal
that was so wide there was no way to accurately zero up on it.  But if I
turned the output of my generator off I found that there was enough
cross talk across the output relay to generate a lot of signal into the
radio.  So its quite possible that you can pull this off.  Or if all
else fails just put a terminator on your generator and run a cable out
of it (just a single wire).  then you can run a wire into the rig and
you can then couple these wires more or less to vary the amount of
signal that you want/need.


On Wed, 2008-03-19 at 23:10 +0000, David Ferrington, M0XDF wrote:
> I can't find this in the spec although I expect its there
> what is the max input voltage on Ant 1 & 2?
> I have a ref osc that gives 5MHz at ~ 5mV, I'd like to use this to do  
> a ref cal by direct connection to ant 1 or 2

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[M0XDF]

Thanks all for replies - it appears the oven control is generating  
some harmonics that are getting onto the 5MHz and then I'm picking  
them up - if i don't create some form of closer connection - currently  
just have the output lead (floating BNC) about 1' from K3.
The single wire solution looks promising.
--
The secret of life is honesty and fair dealing. If you can fake that,
you've got it made. -Groucho Marx

On 20 Mar 2008, at 02:55, Brett Howard wrote:

> I had a gen that would give me 1mV and I found that it produced a  
> signal
> that was so wide there was no way to accurately zero up on it.  But  
> if I
> turned the output of my generator off I found that there was enough
> cross talk across the output relay to generate a lot of signal into  
> the
> radio.  So its quite possible that you can pull this off.  Or if all
> else fails just put a terminator on your generator and run a cable out
> of it (just a single wire).  then you can run a wire into the rig and
> you can then couple these wires more or less to vary the amount of
> signal that you want/need.
>
>
> On Wed, 2008-03-19 at 23:10 +0000, David Ferrington, M0XDF wrote:
>> I can't find this in the spec although I expect its there
>> what is the max input voltage on Ant 1 & 2?
>> I have a ref osc that gives 5MHz at ~ 5mV, I'd like to use this to do
>> a ref cal by direct connection to ant 1 or 2

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[M0XDF]

Thanks, this is basically what I did. I made a 2' twisted pair of red  
& black wire and connected one end of the black wire to the output of  
the ref osc (Racal 5MHz stable with oven etc) and connected the other  
end of the red wire to the pin on K3 ANT2 - that gave me 9+20dB which  
was just great - I did the Ref Cal and found I was only a few Hz of  
the setting I done using a broadcast station of much lower freq.
--
73 de M0XDF / K3 #174

On 20 Mar 2008, at 02:55, Brett Howard wrote:

> I had a gen that would give me 1mV and I found that it produced a  
> signal
> that was so wide there was no way to accurately zero up on it.  But  
> if I
> turned the output of my generator off I found that there was enough
> cross talk across the output relay to generate a lot of signal into  
> the
> radio.  So its quite possible that you can pull this off.  Or if all
> else fails just put a terminator on your generator and run a cable out
> of it (just a single wire).  then you can run a wire into the rig and
> you can then couple these wires more or less to vary the amount of
> signal that you want/need.

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