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Re: manhattan style pads
Wes Hayward
开云体育Hi All,
?
Actually, I think that the Manhattan in the QRP
construction method really refers to the use of straight wires on a 90 degree
grid.?? At least that is where the term
originated.?????Typical integrated circuits use a
layout that follows a Manhattan format.? A recent reference is John Baliga,
"Chips Go Vertical," IEEE Spectrum, March, 2004,
pp43-47.????
?
I agree with Hans -- I have really seen no
difference between construction on a ground plane when using pads and building
without them, other than building without is
faster.????? There is rarely a need to go as high as
10M with the resistors if you don't have them around.?? Something much
smaller values will work just as well.
?
My son and I picked the term "ugly" on our 1981 QST
paper "The Ugly Weekender" for a specific reason:?? We wanted to
emphasize that there is no relationship between circuit performance and the
"pretty" nature of the construction, including that on a printed
board.?? In this case, it is the use of extensive ground plane that
makes the circuitry work well.
?
73, Wes
W7ZOI
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Re: manhattan style pads
Bruce Raymond
开云体育Mark
& Hans,
?
Many
thanks for your replies.? Small rectangular pads should work
just
fine,
and those I can come up with - I don't know why it didn't occur
to
me.
?
Thanks
for your help,
Bruce/nd8i
?
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Re: manhattan style pads
Hans Summers
Mark, Bruce et al
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I don't think the difference between "ugly" and "Manhatten" methods is all that much. My method is a bit of a hybrid I suppose. Mostly ugly. But if I find a point needs to be better anchored I sometimes use a 10M resistor to ground (ok for low impedance signal points) or a .22uF capacitor to ground (ok for dc voltage points). Sometimes I find I want pads. I mounted all the BITX20 inductors and trifilar transformers on pads. But not nice circular pads like in the copper island construction kit. I just find scraps of PCB stock and cut them up into rough squares approximately 5mm x 5mm with a wire cutter. They're ugly but it works and takes literally seconds. 73 Hans G0UPL -----Original Message-----
From: Mark Jones <Mark@...> To: BITX20@... <BITX20@...> Sent: Sat Jun 26 16:39:19 2004 Subject: RE: [BITX20] manhattan style pads Bruce I bought a "Copper island Construction Kit" but they ceased trading a while ago, I found someone (and I can't remember who or find the e-mails) that sent me some replacement (re-stock) pads via the GQRP reflector. I just paid the postage - a great deal and very helpful, he said that a friend of his was able to make them at work. Sorry I can't help more - I thought about making some but it was just to tricky. Mark. G0MGX -----Original Message----- From: nd8i [mailto:bruceraymond@...] Sent: 26 June 2004 16:28 To: BITX20@... Subject: [BITX20] manhattan style pads I've been using ugly-style construction, which has worked quite well. I've noticed a bunch of constructors have used Manhattan- style construction. Not being willing to leave well enough alone, I want to give it a try. Where do people get the pads? Or how does one make them from blank pcb material? I suspect that trying to punch them out of pcb material is a pretty slow and tedious process, so I suspect there must be a better alternative. tia, Bruce Yahoo! Groups Sponsor ADVERTISEMENT click here _____ Yahoo! Groups Links * To visit your group on the web, go to: * To unsubscribe from this group, send an email to: BITX20-unsubscribe@... * Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Re: manhattan style pads
Mark Jones
开云体育Bruce
?
I
bought a "Copper island Construction Kit" but they ceased trading a while ago, I
found someone (and I can't remember who or find the e-mails) that sent me some
replacement (re-stock) pads via the GQRP reflector. I just paid the postage - a
great deal and very helpful, he said that a friend of his was able to make them
at work.
?
Sorry
I can't help more - I thought about making some but it was just to
tricky.
?
Mark.
G0MGX
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manhattan style pads
nd8i
I've been using ugly-style construction,
which has worked quite well. I've noticed a bunch of constructors have used Manhattan- style construction. Not being willing to leave well enough alone, I want to give it a try. Where do people get the pads? Or how does one make them from blank pcb material? I suspect that trying to punch them out of pcb material is a pretty slow and tedious process, so I suspect there must be a better alternative. tia, Bruce |
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Re: Atachments
Hans Summers
i am new ot yahoo groups. i don't know if you canIt's definitely possible, I am a member of another group where the members do post pictures to the photos folder, and don't have to be administrator. Have a look at the folders on the group home page I think the way it works is: if you send an attachment to the group, email recipients do receive it. But people who have set up their account to not receive emails, but instead use the web interface, cannot view the photos. Therefore it's best to use the group folders rather than attach things. 73 Hans G0UPL |
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BITX20 component list
ik1zyw
Hi!
Has anyone attempted to list all BITX20 components? I haven't found any link on Ashan's page. Here is my attempt at listing all components, except for the IRF510 PA (had no time). Please warn me off the list if corrections are needed. 73, Paolo IK1ZYW CAPACITORS 0.001u 2 0.1u 34 100p 3 10p 4 1u elec 2 2.2p 2 220p 3 22p var 6 365p var 1 47p 3 50u elec 6 560p 2 56p 1 RESISTORS 1/4W 10 9 22 1 100 13 220 14 470 2 100 lin 1 10k 3 10k lin 2 120k 2 1k 13 220k 1 2k2 1 2k2 9 4k7 3 XTAL 10MHz 5 (10) TRANSISTOR BC547 14 or 2N2222 IC LM386-N1 1 DIODES 36V zener 1 9.1V zener 1 1N4148 13 TRANSFORMERS INDUCTORS see text OTHER Microphone 1 Loudspeaker 8ohm 1 |
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Atachments
Sam Caldwell
G'day Troops,
I note that one or two contributors have mentioned attachments (which do not appear). At the same time there are some photographs which CAN be accessed. Being a Bear of Very Little Brain, I would appreciate it if some kind person would explain - particularly as in the near future there will no doubt be proud builders anxious to display their new-born transceivers. Regards, Sam C. |
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How to post schematics, images, etc.???
k7hkl_arv
Help please...
I'm new to this forum thing, so I have to ask "How does one go about posting a schematic or picture of BITX related info"? I sent an attached file with one of my posts and now my email post is there but the attached .gif file is referenced as "Not Saved". )-8 Thanks, Arv - K7HKL _._ |
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Re: Atachments
Ashhar Farhan
yahoo groups doesnt not retain attachments. if you can forward the
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pictures to me, i canupload them on the folder. i am new ot yahoo groups. i don't know if you can directly upload the pictures without being a moderator. - farhan On Sat, 26 Jun 2004, Sam Caldwell wrote:
G'day Troops, |
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Re: BFO Clarification?
Ashhar Farhan
Mark,
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USB requires setting the carrier to the lower edge of the filter's passband and LSB requires setting the carrier to the upper edge. given that we are sourcing crystals from varied places, it probable that you will have to pull the crysal frequency down for USB and pull it up for LSB. adding a small series capacitance to the crystal pulls the frequency up (good for LSB). to pull the frequency down you need inductive capacitance in series with the crystal. it is often difficult to estimate just how much (capactiance/inductance) will be required to position the bfo correctly. in case of LSB, a 22pf trimmer in series with the crystal can be tweaked to get the proper results. in case of USB, i have found about 5uH to be ideal for the crystals that i have used (3 builds so far). this may not work for you. so you can either play with the number of turns on L3, or use the inductor with a capactiance in series to vary the net reactance to set the frequency properly. - farhan On Fri, 25 Jun 2004, Mark wrote:
All |
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Re: Components
Jon Harris
<AOL> Thanks Hans, all arrived safe and sound
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Jon H. ----- Original Message -----
From: "William Ford" <ford1@...> To: <BITX20@...> Sent: Friday, June 25, 2004 10:18 AM Subject: Re: [BITX20] Components Component parcel received today.many thanks Jack ----- Original Message ----- From: Hans Summers To: 'BITX20@...' Sent: Thursday, June 24, 2004 4:57 PM Subject: [BITX20] Components Hello Just to let you know that all the components arrived this morning, from three different suppliers. The LM386 was from Farnell because I wasn't sure that the Rapid Electronics version was the correct LM386N-1 version. All components have been counted out and shipped, UK orders by first class post (should arrive tomorrow morning) and international orders via airmail. When I'd finished there were 14 BC547 transistors left over. This could be because they are so cheap that counting them precisely costs Rapid more than giving a few extra. Or it could be that I messed up my own counting, as the whole process was rather tedious and I have been having a very stressful day. If anyone is missing any then let me know, or needs some extra spares. I owe quite a few of you emails and also have a couple of other things to say, but am too busy to do it today so pls QRX 72/3 de Hans G0UPL Yahoo! Groups Sponsor ADVERTISEMENT ----------------------------------------------------------------- ------------- Yahoo! Groups Links a.. To visit your group on the web, go to: b.. To unsubscribe from this group, send an email to: BITX20-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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BFO Clarification?
Mark
All
I'm happy soldering here, but have a question: In the text for the BITX20 it says "If you are using this for 14MHz and above, the BFO will need a coil in series with the crystal". This is what I have done - seems to work OK (see G0MGX folder in pictures on reflector). I just saw the alternative coil data that has been posted on the reflector and that says "L3 was used in series between the crystal and the 22pf trimmer cap plus I added 7pf Mica fixed cap across the trimmer. Needed for USB" I am therefore confused! Can anyone shed any light on this? Mark. G0MGX |
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Re: The PC as a lab instrument
Hans Summers
I thought this forum was focused on the BITX20.Hey it wasn't *that* far off topic! Have a look back in the archives... It stems from Farhan's questions about PC use which also relates to his telling us previously about him using his computer for some audio and AGC processing. Several people have asked for possible AGC circuits for the BITX20. I'll see what I can find over the weekend. 73 Hans G0UPL |
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Fw: RE: The PC as a lab instrument
I thought this forum was focused on the BITX20. Have I gotten into the wrong forum by accident?
Arv - K7HKL -----Forwarded Message----- From: Hans Summers <Hans.Summers@...> Sent: Jun 25, 2004 7:34 AM To: "'BITX20@...'" <BITX20@...> Subject: RE: [BITX20] The PC as a lab instrument <html><body> <tt> <BR> does anybody have more stories about using PCs in the <BR><BR> Farhan, I don't have a PC at home at all, except an old laptop my XYL uses<BR> for internet access. I prefer to do everything without a PC. I even built my<BR> crazy 30m QRSS beacon project with no PC or microcontroller, see<BR> <a href="></a> and<BR> <a href="></a> . I sit in front of a<BR> computer here in the office every day and somehow prefer that when I am at<BR> home I don't have to be attached to one.<BR> <BR> There's also the problem of the "homebrew only" law which rules my station.<BR> So far the only exception to it is my old 5MHz oscilloscope and my DVM. Some<BR> day I will get my Z80 computers up and running, and will be able to write<BR> some homebrew software for QRSS and PSK31 etc. <BR> <BR> 73 Hans G0UPL<BR> <a href="></a><BR> </tt> <br> <!-- |**|begin egp html banner|**| --> <table border=0 cellspacing=0 cellpadding=2> <tr bgcolor=#FFFFCC> <td align=center><font size="-1" color=#003399><b>Yahoo! Groups Sponsor</b></font></td> </tr> <tr bgcolor=#FFFFFF> <td align=center width=470><table border=0 cellpadding=0 cellspacing=0> <tr> <td align=center><font face=arial size=-2>ADVERTISEMENT</font><br><a href=" alt=""><img src=" alt="click here" width="300" height="250" border="0"></a></td></tr></table> </td> </tr> <tr><td><img alt="" width=1 height=1 src="></td></tr> </table> <!-- |**|end egp html banner|**| --> <!-- |**|begin egp html banner|**| --> <br> <tt><hr width="500"> <b>Yahoo! Groups Links</b><br> <ul> <li>To visit your group on the web, go to:<br><a href="></a><br> <li>To unsubscribe from this group, send an email to:<br><a href="mailto:BITX20-unsubscribe@...?subject=Unsubscribe">BITX20-unsubscribe@...</a><br> <li>Your use of Yahoo! Groups is subject to the <a href=">Yahoo! Terms of Service</a>. </ul> </tt> </br> <!-- |**|end egp html banner|**| --> </body></html> |
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BITX20 & BITX40
Hello to the BITX20 group (this is my first posting on this forum).
Farhan and myself have exchanged a couple of off-forum emails regarding mods to his excellent design. One interesting possibility is replacement of the LM-386 with a discrete component AF Amplifier. He said that he had not had the time to work up a schematic...so I have provided one (see attached .gif file). This can allow those without access to an LM-386 to build the unit. Also, my layout for the BITX20 uses 10.7 MHZ IF transformers salvaged from dead AM/FM radios ( I dislike winding toroids! ). My construction is a BITX40 (40 Meters) and requires 55 pf across the 10.7 IFs to resonate on 7.2 MHZ. These 10.7 IF transformers might be made to resonate on 20M if the internal capacitors were removed ( break them with a screwdriver point ) and a small variable ( 5-25pf ) used to bring them to resonance. 73's Arv - K7HKL |
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Re: More components
Hans Summers
开云体育Thanks
for the offer Bruce. Let's keep it in mind and see how it goes. Over half the
orders I had were from the UK, other than that US, Singapore and New Zealand. I
don't know if that's because I announced the list on the GQRP mailing list and
therefore more UK members joined, or if people were more inclined to buy locally
to keep postage costs down. Though at ?1.31 for postage for the packs to the US
and worldwide, it wasn't too bad.
?
Is
anyone a member of the US QRP-L list? I was but I couldn't handle the huge
volume of email so I unsubscribed. Perhaps someone who's a member might like to
announce the existence of this group, I'm sure the BITX20 would be of interest
to many on that list too.
?
73
Hans G0UPL
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Re: The PC as a lab instrument
Hans Summers
There's also the problem of the "homebrew only" law which We should not look askance at ALL "store-bought" technology.Don't get me wrong, I don't look askance at store-bought technology at all, nor have anything against it or any other aspect of amateur radio. Some people are committed QRP enthusiasts. I am mostly QRP but sometimes if condx are bad and I want to get through to a friend I turn the 80m CW TX up to its maximum 10W and I don't feel bad about it. There are so many aspects to amateur radio, each ham has his own areas of interest. Some hate CW, others operate it exclusively. To each his own! But my own passion is to homebrew everything. For really extreme homebrew, I hope one day to build a valve transmitter and matching receiver using components which are all constructed from household items or things that can be purchased from the hardware store. Every component: valves from baby food jars, capacitors from kitchen foil, etc etc. See for the capacitor I built, the only part so far. But that's just me - people who operate QRQ QRO black box contest stations don't bother me either. Unless it's a time such as once happened when I was in QSO with an SM6 on 80m, 2-way QRP CW and both about 339 or something rather marginal, and midnight GMT comes around and suddenly the whole place explodes with contest traffic and the SM6 and myself, well we both got practically vapourised by the volume of the audio in our receivers. Had to curse them a bit then ;-) 73 Hans G0UPL |
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Re: Components
Hans Summers
Mine arrived today too, many thanks Hans.No problem Mark. Sorry list members, Jack's earlier message on this subject and my reply got copied to the whole list when in fact it was intended to be offlist. Note that this list is configured such that the default reply address is the list itself rather than the original message sender. This means that by default replies go back to the list and if you want to reply only to the sender you have to copy and paste their address in. I prefer it this way, it generates more list traffic but I feel that often what is of interest to the original sender will usually be of interest to others, since we are in general all discussing the same rig. If there is any significant feeling about this and you want it set the other way, that can be done. 73 Hans G0UPL |
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