How to test noise blanker

[Mike Markowski]

Guys,

Can anyone recommend a way to test my new K2 noise blanker?  My antenna
(260' long dipole) is nearly 200' behind the house, so I'm thinking of
loosening feedline connector & turning on a hair dryer nearby.  Maybe
even use a short random wire antenna for the rx test.  Any better
suggestions?

I'm lucky to live in a rural area with no noise needing blanking...but I
couldn't resist maxing out the K2.  I'm pretty sure the K2's "not inst"
message flashes a subliminal "buy me" message.

Thanks,
Mike  ab3ap
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Brian Murrey-2]

I could be wrong...but I think the NB is desgned to block out automobile
ignition noise, which comes in real handy when it is in a K2 doing Mobile
Operations.

You can try it in your car, with the car running and see what kind of
difference it makes.

73

----- Original Message -----
From: "Mike Markowski" <[hidden email]>
To: "Elecraft email" <[hidden email]>
Sent: Tuesday, June 27, 2006 1:01 PM
Subject: [Elecraft] How to test noise blanker

> Guys,
>
> Can anyone recommend a way to test my new K2 noise blanker?  My antenna
> (260' long dipole) is nearly 200' behind the house, so I'm thinking of
> loosening feedline connector & turning on a hair dryer nearby.  Maybe
> even use a short random wire antenna for the rx test.  Any better
> suggestions?
>
> I'm lucky to live in a rural area with no noise needing blanking...but I
> couldn't resist maxing out the K2.  I'm pretty sure the K2's "not inst"
> message flashes a subliminal "buy me" message.
>
> Thanks,
> Mike  ab3ap
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Darwin, Keith]

The NB was optimized to block out ignition noise from UPS trucks.
Proper testing requires you order more stuff from Elecraft so UPS will
return.

Actually, it was quite tricky coming up with a circuit to block out the
ignition noise from a diesel engine :-)

73!

- Keith KD1E -
- K2 5411 with no NB -

----- Original Message -----
From: "Mike Markowski"


> Can anyone recommend a way to test my new K2 noise blanker?  My
antenna
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[roncasa]

hahahhahahahahahaha!

But what about Fed EX??
If it works on their trucks too, then... then...
would they be FedUp!?
:)

Ron, wb1hga

   Keith wrote:
> The NB was optimized to block out ignition noise from UPS trucks.
> Proper testing requires you order more stuff from Elecraft so UPS will
> return.

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Ron D'Eau Claire-2]

Mike AB3AP asked:

Can anyone recommend a way to test my new K2 noise blanker?  My antenna
(260' long dipole) is nearly 200' behind the house, so I'm thinking of
loosening feedline connector & turning on a hair dryer nearby.  Maybe even
use a short random wire antenna for the rx test.  Any better suggestions?

-------------------

If you've got a cheap lamp dimmer around that produces a huge buzz when it's
set somewhere between full on and off, the NB should kill all that noise
very nicely. The hair dryer might do it if it's commutator noise that it
generates.

The NB is designed to eliminate repetitive, high-amplitude, short duration
pulses such as those (and those generated by unshielded auto ignitions).

Ron AC7AC

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Ken Alexander-2]

Based on observations after driving many thousands of
kilometers with a transceiver parked on 50.125, a sure
fire test of a noise blanker would be to position your
receiving antenna near just about any Chrysler minivan
that's more than a few years old.  

I can't explain why just them, but the evidence was
too obvious to ignore; they seem to radiate a lot of
ignition noise.

73,

Ken Alexander
VE3HLS



--- Ron D'Eau Claire <[hidden email]> wrote:

> Mike AB3AP asked:
>
> Can anyone recommend a way to test my new K2 noise
> blanker?  My antenna
> (260' long dipole) is nearly 200' behind the house,
> so I'm thinking of
> loosening feedline connector & turning on a hair
> dryer nearby.  Maybe even
> use a short random wire antenna for the rx test.
> Any better suggestions?
>
> -------------------
>
> If you've got a cheap lamp dimmer around that
> produces a huge buzz when it's
> set somewhere between full on and off, the NB should
> kill all that noise
> very nicely. The hair dryer might do it if it's
> commutator noise that it
> generates.
>
> The NB is designed to eliminate repetitive,
> high-amplitude, short duration
> pulses such as those (and those generated by
> unshielded auto ignitions).
>
> Ron AC7AC
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[VR2BrettGraham]

KD1E added to another comment:

>>The NB was optimized to block out ignition noise from UPS trucks.
>>Proper testing requires you order more stuff from Elecraft so UPS will
>>return.
>
>Actually, it was quite tricky coming up with a circuit to block out the
>ignition noise from a diesel engine

I would hate to imagine what the running costs are of that petrol
cement lorry N3CSY blanked out - they probably have the most
dear product around!

I believe there was mention in the past that the K2's NB was
optimized to some extent on a VW Transporter (replace with
model name used in your market) of vintage I have forgotten.

The state of motor vehicle ignition systems in NA must have
deteriorated significantly in the past 20 years, as here in
maintenance-prevention-not-preventative-maintenance Asia it's
not much worse than back there back then & it's other noise
(like power) where a NB gets the most use.

Or presumably there are a lot of VW-based buggies or other
less quiet petrol internal combustion engine powered devices
to be encountered in the great NA outdoors nowadays.

Remember, there is nothing wrong with the NB - you just need
to have the right noise.  Perhaps it would be better to call it
something else, as NB does imply something of what it will do
based on what other rigs' NBs do (unlike AUX I/O ;^).

Then there would not need to for the ever repeating
defend-the-NB thread here, usually starting with somebody
wondering in a post if their recently completed NB works as it
doesn't seem to behave as they expected it to (read last
sentence of last paragraph again).

73, VR2BrettGraham

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Sverre Holm-2]

> -----Original Message-----
>
> Can anyone recommend a way to test my new K2 noise blanker?  

The simplest way to test the KNB2 is to rub a screwdriver across Q21 - the
RF Preamplifier- a metal case transistor which is visible when the K2 top is
removed. That will generate the kind of noise that it is supposed to
suppress.

Search the archives with keywords "q21 noise" and you will find more about
this test.


Good luck!

73

Sverre
LA3ZA
http://www.qslnet.de/la3za/
 

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com