----Messaggio originale----
Da: "Michael Hagen" <motdog@...>
Data: 11/07/2017 15.15
A: <[email protected]>
Ogg: Re: [BITX20] BITX40 Sensitivity

If you got real 50 Ohms, the Attenuator is usually 50 Ohms in dB (Power).? You can calculated it.? But you have to know what is coming out of the generator.? You can convert between power and uV with P = E squared/R(that is 50 ohms).? There are also nice charts you can search for, or make your own in Excel.

Measure your output of the generator into the Attenuator with X10 probe and highest freq scope you can get.?

But a bigger signal ahead of the Attenuator are a lot easy to measure.? I use my attenuator all the time, maybe 80 dB cranked in?

I can't recommend the K5BCQ more, it is cheap and works great.? You can make you own real easy.? 1W mox resistors from Mouser work fine.

Make some 20 dB, 6 and 3 stages?

Mike, WA6ISP

On 7/11/2017 4:25 AM, César EA3IAV wrote:

But... If I use an attenuator that is "analog"... How am I going to know the amount of microvolts that I am iinjecting into the BITX?

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

What is that modulation he is using? My generator does not have that.

So far I can't get my BitX to get much below -105 dBm? How his works to
-140 is amazing!

I have been using AM modulation and listening for beat?

I could not hear the audio on you tube, luckily it came up at the end?

Mike, WA6ISP

On 7/11/2017 6:34 AM, Giovanni Caracuta via Groups.Io wrote:

sensitivity or not sensitivity..............
How many don't have see that?

73 de Giovanni (i7iwn)

----Messaggio originale----
Da: "Michael Hagen" <motdog@...>
Data: 11/07/2017 15.15
A: <[email protected]>
Ogg: Re: [BITX20] BITX40 Sensitivity

If you got real 50 Ohms, the Attenuator is usually 50 Ohms in dB
(Power). You can calculated it. But you have to know what is
coming out of the generator. You can convert between power and uV
with P = E squared/R(that is 50 ohms). There are also nice charts
you can search for, or make your own in Excel.

Measure your output of the generator into the Attenuator with X10
probe and highest freq scope you can get.

But a bigger signal ahead of the Attenuator are a lot easy to
measure. I use my attenuator all the time, maybe 80 dB cranked in?

I can't recommend the K5BCQ more, it is cheap and works great.
You can make you own real easy. 1W mox resistors from Mouser work
fine.

Make some 20 dB, 6 and 3 stages?

Mike, WA6ISP


On 7/11/2017 4:25 AM, C??sar EA3IAV wrote:

But... If I use an attenuator that is "analog"... How am I going
to know the amount of microvolts that I am iinjecting into the
BITX?

--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID"MotDog@..."
Mike@...

--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...

What is that modulation he is using??? My generator does not have that.

So far I can't get my BitX to get much below -105 dBm? How his works to -140 is amazing!

I have been using AM modulation and listening for beat?

I could not hear the audio on you tube, luckily it came up at the end?

Mike, WA6ISP
??
On 7/11/2017 6:34 AM, Giovanni Caracuta via Groups.Io wrote:

sensitivity or not sensitivity..............
How many don't have see that?

? 73 de Giovanni (i7iwn)