Loop Antenna broadband amp

[Chuck Olson]

I've been searching for some hints as to what may be in the resin-encased
amplifier used on the Wellbrook loops without much luck. Their power demand
of 130 mA at 12 volts is kind of high for any FET diff-amp, PNP level shift,
into a balanced to unbalance output transformer arrangement. I'm using that
configuration right now on a tuned loop that only requires 17 mA at 9 volts.
Any ideas or links to useful information?

Thanks,

Chuck, w6pkp

[Dale Parfitt]

"Chuck Olson" > wrote in message
...
> I've been searching for some hints as to what may be in the resin-encased
> amplifier used on the Wellbrook loops without much luck. Their power
demand
> of 130 mA at 12 volts is kind of high for any FET diff-amp, PNP level
shift,
> into a balanced to unbalance output transformer arrangement. I'm using
that
> configuration right now on a tuned loop that only requires 17 mA at 9
volts.
> Any ideas or links to useful information?
>
> Thanks,
>
> Chuck, w6pkp

Hi Chuck,

The hi Ic is usually indicative of a CATV device being run in a hi IP3 mode.
The preamp I am using on my 7' shielded loop was originally published by
Burhans and described in the 1985 June Lowdown- using a J310 followed by a
2N3904 and a pair of Mouser audio tranformers both IN and OUT. The URL
appears to have gone away- I can send the schematic if you are interested.

Dale W4OP
>
>

[Chuck Olson]

"Dale Parfitt" > wrote in message
news:RE5Wd.28241$uc.2783@trnddc09...
>
> Hi Chuck,
>
> The hi Ic is usually indicative of a CATV device being run in a hi IP3
mode.
> The preamp I am using on my 7' shielded loop was originally published by
> Burhans and described in the 1985 June Lowdown- using a J310 followed by a
> 2N3904 and a pair of Mouser audio tranformers both IN and OUT. The URL
> appears to have gone away- I can send the schematic if you are
interested.
>
> Dale W4OP

I'm very interested, Dale. I can read wmf, png, jpg, gif and pdf - - maybe a
few more. The png file is usually the most compact.

Thanks,

Chuck

[Dave Platt]

>> The hi Ic is usually indicative of a CATV device being run in a hi IP3
>mode.
>> The preamp I am using on my 7' shielded loop was originally published by
>> Burhans and described in the 1985 June Lowdown- using a J310 followed by a
>> 2N3904 and a pair of Mouser audio tranformers both IN and OUT. The URL
>> appears to have gone away- I can send the schematic if you are
>interested.
>>
>> Dale W4OP
>
>I'm very interested, Dale. I can read wmf, png, jpg, gif and pdf - - maybe a
>few more. The png file is usually the most compact.

I'm interested also. Any chance that a Web-postable file could be
provided?


--
Dave Platt > AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

[Chuck Olson]

"Dave Platt" > wrote in message
...
> >> The hi Ic is usually indicative of a CATV device being run in a hi IP3
> >mode.
> >> The preamp I am using on my 7' shielded loop was originally published
by
> >> Burhans and described in the 1985 June Lowdown- using a J310 followed
by a
> >> 2N3904 and a pair of Mouser audio tranformers both IN and OUT. The URL
> >> appears to have gone away- I can send the schematic if you are
> >interested.
> >>
> >> Dale W4OP
> >
> >I'm very interested, Dale. I can read wmf, png, jpg, gif and pdf - -
maybe a
> >few more. The png file is usually the most compact.
>
> I'm interested also. Any chance that a Web-postable file could be
> provided?
>
Maybe Dale can post it on alt.binaries.schematics.electronic - - okay Dale?