The Xtal Set Society
The Xtal Set Society
profile | register | search | main site


email us
Forums | Rap N Tap Clubhouse - Basic Crystal Radio Fun! | Updating my radio Post Reply Send Topic To a Friend
Author Topic
zlfPosted - 30 September 2012 21:39  Show Profile  Email Poster  Edit Message  
Hey I just built my first crystal radio today, very crude materials, but its a work in progress, as are all good projects. Does anyone know a good way to increase signal, range of frequencies most effectively? for example a certain type of antenna, diode, receiver...etc

zlf

krystalloPosted - 1 October 2012 7:17  Show Profile  Email Poster  Edit Message
Hey ZLF,

Congrats on your set.Crystal sets are FUN!

Before we can give you direction, we need to know where you are.

Can you describe your set, either by words or by link ? Does it work ? How well? How many stations, etc.

Are you urban, suburban or rural ?

Generally the first place I'd suggest looking ( w/o knowing your particulars) is by having the BEST antenna and ground system possible.

There should be online info re crystal set antennas - maybe try searching: single wire end fed or inverted L or long wire antenna or SWL antenna.We'll start there.

K

krystalloPosted - 1 October 2012 7:17  Show Profile  Email Poster  Edit Message
Hey ZLF,

Congrats on your set.Crystal sets are FUN!

Before we can give you direction, we need to know where you are.

Can you describe your set, either by words or by link ? Does it work ? How well? How many stations, etc.

Are you urban, suburban or rural ?

Generally the first place I'd suggest looking ( w/o knowing your particulars) is by having the BEST antenna and ground system possible.

There should be online info re crystal set antennas - maybe try searching: single wire end fed or inverted L or long wire antenna or SWL antenna.We'll start there.

K

krystalloPosted - 1 October 2012 7:18  Show Profile  Email Poster  Edit Message
Hey ZLF,

Congrats on your set.Crystal sets are FUN!

Before we can give you direction, we need to know where you are.

Can you describe your set, either by words or by link ? Does it work ? How well? How many stations, etc.

Are you urban, suburban or rural ?

Generally the first place I'd suggest looking ( w/o knowing your particulars) is by having the BEST antenna and ground system possible.

There should be online info re crystal set antennas - maybe try searching: single wire end fed or inverted L or long wire antenna or SWL antenna.We'll start there.

K

krystalloPosted - 1 October 2012 7:19  Show Profile  Email Poster  Edit Message
Congrats,

Tell us all about your set or provide a link so we can start.

K

_J_Posted - 1 October 2012 18:21  Show Profile  Email Poster  Edit Message
Oh yea, zlf, we sure can help you improve all that. Can you tell us what you are starting with?
Describe the wiring of the circuit?
Describe your antenna and ground?
Describe your earphone?
Do you have strong stations around you?

John Davidson

_J_Posted - 1 October 2012 18:22  Show Profile  Email Poster  Edit Message
Yea.

Edited by - _J_ on 10/2/2012 6:58:04 PM

krystalloPosted - 2 October 2012 7:24  Show Profile  Email Poster  Edit Message
Hey J, looks like you are getting the same posting error that I am.

K

homebrewPosted - 2 October 2012 10:17  Show Profile  Email Poster  Edit Message  
My PC crashed yesterday. Had a virus that loaded everything times three.
golfguruPosted - 2 October 2012 14:44  Show Profile  Email Poster  Edit Message  
Where are ya Z..?

.............

krystalloPosted - 3 October 2012 14:20  Show Profile  Email Poster  Edit Message
?
zlfPosted - 9 October 2012 8:41  Show Profile  Email Poster  Edit Message  
Hey sorry guys, work has been rediculous lately. The radio I built is extremely low-tech, as I found it off some "homemade radios" website.

I'm using a a 50ft stranded 22 gauge wire for the antenna, silicon diode, an old corded receiver, and an 18gauge solid wire coiled around a 4in diameter bottle about fifty times. At first I just threw the antenna over a tree, and could pick up about two stations. I got a little ambitious and strung the antenna to the top of my ten-story apartment building (having to splice some wire to the 50ft strand), but I could only get 2-3 stations (Including 1080 KRLD, which was cool, they were also much louder and clearer though). Not really the results I was expecting, though.

I'm making a list of all the variables I could change, only making one modification at a time in order to deduce what makes the greatest impact. I do plan to change from silicon to a germanium diode, simple trip to Fry's Electronics. I'm also thinking about how to better design the antenna, or even how to better wrap the coils. OR to even come up with a contraption using a dial like a real radio (much further down the road I think).

Any ideas on a simple but effective homemade antenna?

Thanks

zlfPosted - 9 October 2012 8:42  Show Profile  Email Poster  Edit Message  
Hey sorry guys, work has been rediculous lately. The radio I built is extremely low-tech, as I found it off some "homemade radios" website.

I'm using a a 50ft stranded 22 gauge wire for the antenna, silicon diode, an old corded receiver, and an 18gauge solid wire coiled around a 4in diameter bottle about fifty times. At first I just threw the antenna over a tree, and could pick up about two stations. I got a little ambitious and strung the antenna to the top of my ten-story apartment building (having to splice some wire to the 50ft strand), but I could only get 2-3 stations (Including 1080 KRLD, which was cool, they were also much louder and clearer though). Not really the results I was expecting, though.

I'm making a list of all the variables I could change, only making one modification at a time in order to deduce what makes the greatest impact. I do plan to change from silicon to a germanium diode, simple trip to Fry's Electronics. I'm also thinking about how to better design the antenna, or even how to better wrap the coils. OR to even come up with a contraption using a dial like a real radio (much further down the road I think).

Any ideas on a simple but effective homemade antenna?

Thanks

zlfPosted - 9 October 2012 8:43  Show Profile  Email Poster  Edit Message  
I guess I'm getting the same error message. Hahahaha, sorry about that.

zlf

Edited by - zlf on 10/9/2012 8:45:38 AM

_J_Posted - 9 October 2012 9:16  Show Profile  Email Poster  Edit Message
That is a server error, we all get it once in a while. No worries.

That sounds like a pretty good radio! Getting the antenna up high will help a lot.

John Davidson

krystalloPosted - 9 October 2012 11:6  Show Profile  Email Poster  Edit Message
Hey ZLF,

You use an old corded "receiver". I assume receiver means HEADPHONES, yes ?

Definitely swap out the Si diode and use a germanium diode.

I'll also assume that you will be wiring the phones directly to the 1n34 germanium diode. This arrangement is SORT of OK for now, but an audio matching transformer(Bogen T-725) is something to consider.

Also , sometimes old "magnetic" type headphones can, at times, have weak magnets or other issues (warped discs, etc)- they can still work, but not that great.There IS a way to "sort of " test them though.

I'm guessing that you use a variable cap to tune the set,which is good.

Now the bad news, building a really GOOD crystal radio requires at least "some" cash.

How much $$ depends on how nuts you want to go- is this just a project to "demonstrate the crystal set concept"( which you already have done by hearing 2 or 3 stations) or are you really serious about big improvements to (hopefully ) hear more stations or possibly some long distance (hundreds of miles).

The most basic "semi serious" crystal radio needs at a minimum between 2 to 5 variable capacitors and 2 to 3 coils, "proven" good working headphones and an audio transformer .

There are lot of PRIMITIVE (and frankly, poorly designed ) crystal set sets out there. Most were intended to get one or two local stations , so the designs didn't have to be great.

But to separate a number of local stations and /or get long distance usually requires an effort in most locations ( especially big cities).

K

Topic is 2 Pages Long:    1 2

Click Here To Close Thread, Administrators & Moderators Only.

Show All Forums | Post Reply