amdx wrote:
Hi All,
Please see pictures and diagram at ABSE.

I duplicated a circuit for someone because they got a bad
output waveform.
Well I did too.
Capacitor = air variable set at 365pf
inductor = 41uh aircore
With freq set at 1.3Mhz I have the voltages as follows;
Collector - 11.8vdc
Base - 3.1vac riding on top of 3.2vdc
Emitter - 2.5vac riding on top of 3.9vdc (Don't be critical, it's not ac
if it sets on dc)

As I shift up in freq at about 2.7Mhz the voltages jump.

Capacitor = air variable set at 40pf
inductor = 41uh aircore
Freq = 3.7Mhz
Collector - 11.8vdc
Base - 10vac riding on top of 1.8vdc
emitter - 1.1vac riding on top of 9vdc

The base waveform in both senerios is much more sinewave (ish) than the
output.

Any ideas how to get a decent waveform? The next step will be a buffer,
but...

Note; original schematic used a crystal, I substituted the LC. Could this
be the
cause of the distortion?

Thanks, Mike

Mike ,

What is ABSE? Need a circuit before comments can be made.

Roger

wrote in message
ups.com...

amdx wrote:
Hi All,
Please see pictures and diagram at ABSE.

I duplicated a circuit for someone because they got a bad
output waveform.
Well I did too.
Capacitor = air variable set at 365pf
inductor = 41uh aircore
With freq set at 1.3Mhz I have the voltages as follows;
Collector - 11.8vdc
Base - 3.1vac riding on top of 3.2vdc
Emitter - 2.5vac riding on top of 3.9vdc (Don't be critical, it's not
ac
if it sets on dc)

As I shift up in freq at about 2.7Mhz the voltages jump.

Capacitor = air variable set at 40pf
inductor = 41uh aircore
Freq = 3.7Mhz
Collector - 11.8vdc
Base - 10vac riding on top of 1.8vdc
emitter - 1.1vac riding on top of 9vdc

The base waveform in both senerios is much more sinewave (ish) than the
output.

Any ideas how to get a decent waveform? The next step will be a buffer,
but...

Note; original schematic used a crystal, I substituted the LC. Could
this
be the
cause of the distortion?

Thanks, Mike

Mike ,

What is ABSE? Need a circuit before comments can be made.

alt.binaries.schematics.electronic

Most of the current newsgroup servers have blocked the binaries groups. A
lot of us can't get them.

Jim


"amdx" wrote in message
...



Mike ,

What is ABSE? Need a circuit before comments can be made.

alt.binaries.schematics.electronic

"RST Engineering" wrote:

Most of the current newsgroup servers have blocked the binaries groups. A
lot of us can't get them.

20 cents a day will get your binaries back...

On Sun, 21 Jan 2007 09:27:36 -0800, "RST Engineering"
wrote:

Most of the current newsgroup servers have blocked the binaries groups. A
lot of us can't get them.

Jim


I have recently subscribed to a service from the Agent Newsreader
folks at http://www.forteinc.com/agent/support.php
For $2.95 per month I get 7G of upload/download. Where your usage
stands is available all the time. They claim to cover the entire
Usenet. It works for me.


BTW, are you the RST Engineering that used to make the Aviation
Electronics in the 1970's?

John Ferrell W8CCW

"John Ferrell" wrote in message
...


I have recently subscribed to a service from the Agent Newsreader
folks at http://www.forteinc.com/agent/support.php
For $2.95 per month I get 7G of upload/download. Where your usage
stands is available all the time. They claim to cover the entire
Usenet. It works for me.

Yeah, and $3 a month here and $5 a month there for stuff that wildblue ought
to provide along with their $50 a month satellite service.




BTW, are you the RST Engineering that used to make the Aviation
Electronics in the 1970's?

And still do. www.rstengineering.com

Jim

BTW, are you the RST Engineering that used to make the Aviation
Electronics in the 1970's?

And still do. www.rstengineering.com

Jim

Nice products. I still have a couple of your VOR testers that I mainly
used to verify my radios worked before departing the Bahamas on an
international IFR flight plan. After the plane had set a couple of
weeks it was nice to know the Navs were working before getting
airborne.

I probably ought to EBAY them. I have not used either for over 20
years and will have no use in the future!

John Ferrell W8CCW