In . net, "Jim Pennell"
wrote:


----- Original Message -----
"Frank Gilliland" Wrotee:

Is this band still allocated for low power experimental use without a
license?

Yep, limited to 1 watt power input to the final, and the total
antenna/ground
system is limited to 50 feet.




Yes, the Transmit is limited to that power and antenna. However, the Rx
is not and I'd use a fairly large antenna or tuned antenna loop with a FET
follower at these frequencies.

For the rest of the Rx, a converter is a good way to go and the FET will
give a low enough output impedance for a regular mixer of some sort.

Jim Pennell
N6BIU


I've played around on this band for a few year now, and I've noticed a few
things. It doesn't seem to matter what receiver you use because the noise on the
band is almost always much higher than the receiver's front-end noise. Increase
the receiver's sensitivity and you increase the noise. Instead, work on the
receiver's selectivity. Or send the audio output from the receiver into your
computer's sound card and use one of those great FFT programs designed for
weak-signal work. Do that and you can see signals well below the noise floor.

As far as antennas are concerned, loops are popular but there are plenty of
other options. Remember that the band is for experimentation, and part of the
fun comes from experimenting with different antennas. But even with all the
noise on the band, you can still work 20+ miles CW with nothing more than a wire
in the tree and any old receiver that will tune the band.






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----- Original Message -----
"Frank Gilliland" Wrotee:

Is this band still allocated for low power experimental use without a
license?

Yep, limited to 1 watt power input to the final, and the total
antenna/ground
system is limited to 50 feet.




Yes, the Transmit is limited to that power and antenna. However, the Rx
is not and I'd use a fairly large antenna or tuned antenna loop with a FET
follower at these frequencies.

For the rest of the Rx, a converter is a good way to go and the FET will
give a low enough output impedance for a regular mixer of some sort.

Jim Pennell
N6BIU

Frank Gilliland wrote in
:

"Transmitter for the Neglected Band" and "Tuner for the Neglected
Band", both written by Jim White/W5LET, were in the Jan and Feb 72
editions of Popular Electronics, respectively. You can probably find
those issues on film at your local public library. Both are tube
projects. The tuner (receiver) is some kind of funky TRF/superhet
hybrid, and is tuned by adjusting four compression trimmers (IOW, the
tuning is virtually fixed).


Ah, that's the one. I remember it well. With the plethora of digital radios
that tune down to 150 kHz these days, the rx wouldn't even be a
consideration.

Frank Gilliland wrote in
:

"Transmitter for the Neglected Band" and "Tuner for the Neglected
Band", both written by Jim White/W5LET, were in the Jan and Feb 72
editions of Popular Electronics, respectively. You can probably find
those issues on film at your local public library. Both are tube
projects. The tuner (receiver) is some kind of funky TRF/superhet
hybrid, and is tuned by adjusting four compression trimmers (IOW, the
tuning is virtually fixed).


Ah, that's the one. I remember it well. With the plethora of digital radios
that tune down to 150 kHz these days, the rx wouldn't even be a
consideration.

In article ,
Nothing40 wrote:
Hey Gang..

I have recently become interested in the 1750 meter band (160-180
khz).I have been searching the net for
information,circuits,reports,anything I can find!
I plan on homebrewing a TX/RX pair,once I do a little more research. I
have found a few Schematics,and plans for a couple different
transmitters,and antenna's,but no plans for recievers. Can anyone help
me out? I'd prefer to go the homebrew route,mostly for experience,and
for a learning experience. [snip]

A transceiver for this "band" was in the SEP 94 issue of 73.

I'd always wanted to put together a regen for this band. Regenerative
detectors are at their best when they are rather tightly coupled to
antennas that are electrically short. One reality of 1750 meters is
that any antenna one man can lift is bound to be "electrically short".
--

R F Wieland Newark, DE 19711-5323 USA 39.68N 75.74W
Icom R75 Heathkit GR-81 Inverted-L in the attic
Reply to wieland at me dot udel dot edu

Regenerative detectors are at their best when they are rather
tightly coupled to antennas that are electrically short.
=============================

What gave you that idea?
---
Reg

Regenerative detectors are at their best when they are rather
tightly coupled to antennas that are electrically short.
=============================

What gave you that idea?
---
Reg

In article ,
Nothing40 wrote:
Hey Gang..

I have recently become interested in the 1750 meter band (160-180
khz).I have been searching the net for
information,circuits,reports,anything I can find!
I plan on homebrewing a TX/RX pair,once I do a little more research. I
have found a few Schematics,and plans for a couple different
transmitters,and antenna's,but no plans for recievers. Can anyone help
me out? I'd prefer to go the homebrew route,mostly for experience,and
for a learning experience. [snip]

A transceiver for this "band" was in the SEP 94 issue of 73.

I'd always wanted to put together a regen for this band. Regenerative
detectors are at their best when they are rather tightly coupled to
antennas that are electrically short. One reality of 1750 meters is
that any antenna one man can lift is bound to be "electrically short".
--

R F Wieland Newark, DE 19711-5323 USA 39.68N 75.74W
Icom R75 Heathkit GR-81 Inverted-L in the attic
Reply to wieland at me dot udel dot edu