M. J. Powell wrote:
In message . edu,
William Mutch writes

The anonymous homebrew xmtr I picked up at the AWA meet last
spring has finally make its first QSO, heard 589 in Texas by KE5HQ on 40
CW, but he reports what I sort of knew anyway...the rig has a chirp. The
oscillator is an electron coupled 12BY7, crystal controlled. What are
the cures for chirp ?? Slightly detune the buffer ?? add caps to the
power supply. Trying the easiest things first, how should I proceed ??

My DX100 had a bad chirp. Cured by cleaning the key contacts with fine
emery paper.

If it ever comes to that again, don't use emery, or any abrasive paper, to
clean up electrical contacts.

The abrasive tends to embed into the soft contact material, and make for
contact problems.

The recommended repair is to burnish the contacts. That can be done by taking
an old hacksaw blade, and grinding the flat sides on a coarse grinding
wheel. The grinding wheel will put fine scratches in the saw blade's sides,
and these scratches make a pretty nice, very fine file... perfect for burnishing
key and relay contacts.

'Chuck

In the old days, chirp was a favorite discussion topic.

You have been given a number of ideas, so here are a few more. When the
feedback capacitor dielectric heats up, the frequency can change. Using an
air dielectric is best, but a silver mica or NP0 capacitors usually work.
If you do not want to regulate the screen voltage on the oscillator, you can
adjust it until you find the "sweet" spot, which will reduce drift. You
need a tapped resistor or rheostat to do that.

Crystal oscillators are supposed to be simple, so the cure should be simple,
too. Something is heating up causing a frequency change when you key it.

Make sure you are not overloading your receiver, causing a phantom chirp
(only one can hear it is you).

73, Colin K7FM

"Irv Finkleman" wrote in message
...
William Mutch wrote:

The anonymous homebrew xmtr I picked up at the AWA meet last
spring has finally make its first QSO, heard 589 in Texas by KE5HQ on 40
CW, but he reports what I sort of knew anyway...the rig has a chirp. The
oscillator is an electron coupled 12BY7, crystal controlled. What are
the cures for chirp ?? Slightly detune the buffer ?? add caps to the
power supply. Trying the easiest things first, how should I proceed ??

I always liked the sound of a chirpy signal. It never bothered me,
and when you hear one now you know there's a real ham behind the key!

Irv VE6BP

Chirps, clicks and fists were the identification marks of the operator.
I, for one, always admired the variance of sounds from one rig to another.
For example, at one time in history, the DX-100 was unmistakable, and if the
operator was using a straight key, one could call him by name immediately.
If your report was a "c" (534C) for example, you knew that you had more
than a "c" (chirp), but probably a "yoop", and were probably using a
rehashed command set or a liaison rig...... BC-459, BC-191 or BC-375 maybe.
BC-375 using a 28 volt dynamotor on 24 volts of fading automobile batteries
required two hands at the receiving end, and heaven help him if he needed a
pencil as well to copy!
Lynn, W7LTQ..... long live the chirp!

Hello gang

Little chirp never hurt anybody,
some chirp ads character to a signal

not about to change 60 year old ART-13
or play around other old style tube/hb transmitters
to try to get rid of something, I like!

key clicks diffrent story
nothing like causing crud 10 kc or more up and down band

when I hear a chirp on some ops sig
usualy it means they are running hb or older tube rig

often give them a call
know if start to talk about 6AG7 6L6 mopa, 45 push pull hartley
or autodine receivers

there is a good chance the op on the other end
will know what the heck im talking about
and
not come back with
"wx here is"

still use an old bug, so not only have a chirp,
but also some Lake Eire swing

please keep those OO cards comming in for drift and chirp
working on WAS OO

thank you
Mac w8znx, real radios still glow in the dark

On 12/8/05 2:09 PM, in article , "de Mac"
wrote:

Hello gang

Little chirp never hurt anybody,
some chirp ads character to a signal

not about to change 60 year old ART-13
or play around other old style tube/hb transmitters
to try to get rid of something, I like!

key clicks diffrent story
nothing like causing crud 10 kc or more up and down band

when I hear a chirp on some ops sig
usualy it means they are running hb or older tube rig

often give them a call
know if start to talk about 6AG7 6L6 mopa, 45 push pull hartley
or autodine receivers

there is a good chance the op on the other end
will know what the heck im talking about
and
not come back with
"wx here is"

still use an old bug, so not only have a chirp,
but also some Lake Eire swing

please keep those OO cards comming in for drift and chirp
working on WAS OO

thank you
Mac w8znx, real radios still glow in the dark


In the 50's, just as today, chirp was something only a Lid's transmitter
would have. It was *rare* that anyone had a persistent chirp. If someone
had chirp they fixed it; sometimes with a hammer. Even some crystal chirp
faults could be fixed by a little work on the bevel of the crystal's edge.

Chirp is for the birds.

Swing is for those who have it, not make it.

Yes, real radios glow in the dark, but today's fake radios have better specs
and DO perform better. My old line through 60 years included BC-312, a
couple HROs, HQ-129X, NC-125, SX-100, GPR-90, 51J-4, some homebrew, and some
I don't recall, but I like my R71A better than all of them.

Nostalgia looks great on a shelf.

A 300W plate modulated signal using an old D-104 mike on 75M still sounds
great.

Don

Chirp is for the birds.

Pfoooot!

Chirp Chirp Chirp Chirp, Chirp Chirp

Lynn, W7LTQ (1948 with BC-375)

Lynn Coffelt wrote:
Chirp is for the birds.

Pfoooot!

Chirp Chirp Chirp Chirp, Chirp Chirp

Lynn, W7LTQ (1948 with BC-375)

Like the signal I heard last night around 7070 Kc: light chirp, and a
constant slow drift across the band. Lovely 1950s signal, and the op
(N5BBB, I think) had a lovely fist to go with it. I could listen to it
all night -- if I could catch up with it. ;=)

--
Mike Andrews W5EGO 15WPM on a really good day
Extra
Tired old sysadmin working on his code speed

Sez you...


"Don Bowey" wrote in message
...
On 12/8/05 2:09 PM, in article , "de
Mac"
wrote:

Hello gang

Little chirp never hurt anybody,
some chirp ads character to a signal

not about to change 60 year old ART-13
or play around other old style tube/hb transmitters
to try to get rid of something, I like!

key clicks diffrent story
nothing like causing crud 10 kc or more up and down band

when I hear a chirp on some ops sig
usualy it means they are running hb or older tube rig

often give them a call
know if start to talk about 6AG7 6L6 mopa, 45 push pull hartley
or autodine receivers

there is a good chance the op on the other end
will know what the heck im talking about
and
not come back with
"wx here is"

still use an old bug, so not only have a chirp,
but also some Lake Eire swing

please keep those OO cards comming in for drift and chirp
working on WAS OO

thank you
Mac w8znx, real radios still glow in the dark


In the 50's, just as today, chirp was something only a Lid's transmitter
would have. It was *rare* that anyone had a persistent chirp. If someone
had chirp they fixed it; sometimes with a hammer. Even some crystal chirp
faults could be fixed by a little work on the bevel of the crystal's edge.

Chirp is for the birds.

Swing is for those who have it, not make it.

Yes, real radios glow in the dark, but today's fake radios have better
specs
and DO perform better. My old line through 60 years included BC-312, a
couple HROs, HQ-129X, NC-125, SX-100, GPR-90, 51J-4, some homebrew, and
some
I don't recall, but I like my R71A better than all of them.

Nostalgia looks great on a shelf.

A 300W plate modulated signal using an old D-104 mike on 75M still sounds
great.

Don

Yes, real radios glow in the dark, but today's fake radios have better[/color]
specs
and DO perform better. My old line through 60 years included BC-312, a
couple HROs, HQ-129X, NC-125, SX-100, GPR-90, 51J-4, some homebrew, and
some
I don't recall, but I like my R71A better than all of them.

Nostalgia looks great on a shelf.

A 300W plate modulated signal using an old D-104 mike on 75M still sounds
great.

Don



[/quote]
most of the better old tube receivers can still copy weak sig
on 80 or 40 cw than most of the so called modern
dc to daylight solid state radios

you can keep the R71A
I will keep using my 75S 3, 2A, 2B, NC 183D, HRO 5RA 1, R 390A

and if nostalgia realy looks best on the shelf
guess 300watts class b plate mod am rig should
also be set aside for modern JA rice box radios

lets see now
you object to lake eire swing and chirp
but like class b plate mod AM on 75 meters

sure sounds like the pot calling the kettle black to me

de Mac w8znx

On 12/10/05 1:57 PM, in article , "de Mac"
wrote:

(snip)

and if nostalgia realy looks best on the shelf
guess 300watts class b plate mod am rig should
also be set aside for modern JA rice box radios

I like my rice box rig, too. All things considered, it's better than all
the toob rigs I've bought and built.


lets see now
you object to lake eire swing and chirp
but like class b plate mod AM on 75 meters

Apples and oranges, but good try.....


sure sounds like the pot calling the kettle black to me

de Mac w8znx


By the way, you really should learn to post correctly.

Don