I suggest that you really meant that crystal sets could only tune/operate within the frequency range of the LC circuit; combined with the sensitivity or rectification ability of the Cat's Whisker/Gallium contact ""diode", replaced in mid-20th century by semiconductor diodes, such as the OA81.

You may remember the double versions of about the late 1950s, where one set tuned to a nearby strong station, to produce a DC supply for the second set - with an early transistor added for amplification, so as to hear more remote, weaker stations.

In reply to a post by Zarjaz:

I might add that the OP's issue doesn't sound like a REIN fault to me, sounds like a good old fashioned noisy line.

Hello Zarjaz, as previously explained the drop in dsl snr is accompanied by a loud buzzing noise from the radio.

In reply to a post by Zarjaz:

and request the drop wire is replaced.

Openreach won't just come out and replaced their spans on your say-so.

I wouldn't expect them to but I would expect them to investigate, not sure where you got that quote, was it me

In reply to a post by RobertoS:

Click the quote button on a post that contains a quote and to will see how it is done. You can also edit the quote before posting - as you can see I removed most of your post .

You can also use anything you have copied to your clipboard from any source. Just the [ then q then ] to open and nearly the same to close, just /q instead of q .

Thank you so much, this is the bit I get confused with trying to edit quotes within quotes but its just following the hierarchy,

thanks for the tip about how to make any piece of text into a quote

In reply to a post by eckiedoo:

I suggest that you really meant that crystal sets could only tune/operate within the frequency range of the LC circuit; combined with the sensitivity or rectification ability of the Cat's Whisker/Gallium contact ""diode", replaced in mid-20th century by semiconductor diodes, such as the OA81.

Well yes I agree with the above, but crystal`s each had a high and low range and depending on the LC circuit could be replaced [or switched] between to cover more ranges.
But that was years ago even before push/pull AD161/162 final amplification.
These days I mostly use a logic probe to test the state of gates on microchips which as you know contain thousand`s and more semiconductors.

You've also picked up that the closing of a quote (on these forums but rarely elsewhere) inserts a blank line. Inserting a carriage return, never mind two as some people do from habit, is not needed.

Edited by RobertoS (Tue 23-Aug-16 09:46:43)

I suspect that you are confusing (quartz) Crystals used in Oscillators for Transmitters and also the Local Oscilattors of Fixed-Frequency receivers, rather than the (diode) crystals of Crystal Set radios.

At one time, I had a really nice 3.5 MHz Crystal in a B9A(?) valve/tube, so clearly visible for teaching purposes.

The crystal itself was about 2.5 inches high by 0.5 inches thick by about .05 inch thick. (62.5 mm x 12.5 mm x 1.25 mm)

Gold plated for contact purposes.

It provided the main timing pulses for a very early Numerical Control System for Milling Machines etc.

About 60 years back!

In reply to a post by ironman12345:

In reply to a post by eckiedoo:

I suggest that you really meant that crystal sets could only tune/operate within the frequency range of the LC circuit; combined with the sensitivity or rectification ability of the Cat's Whisker/Gallium contact ""diode", replaced in mid-20th century by semiconductor diodes, such as the OA81.

Well yes I agree with the above, but crystal`s each had a high and low range and depending on the LC circuit could be replaced [or switched] between to cover more ranges.
But that was years ago even before push/pull AD161/162 final amplification.
These days I mostly use a logic probe to test the state of gates on microchips which as you know contain thousand`s and more semiconductors.

WILL YOU TWO PLEASE DESIST AND TAKE YOUR CRYSTAL RADIO DISCUSSION ELSEWHERE instead of hijacking my thread about REIN issues.

Forget broadband and get your noisy line sorted then your bb may be ok. If not then you can talk about REIN.

as previously explained the drop in dsl snr is accompanied by a loud buzzing noise from the radio.

Lots of things make audible noise on an MW radio, that doesn't mean that the source is producing REIN.

You need specialist equipment to hunt in earnest.