Re: WANTED VK3YE LED LDR AGC diagram
I watched his youtube videos, and froze it to get the diagram. Starts off with a basic diagram, then gets onto the better version, 3 videos all worth watching.
Phil - G7BZD
On Mon, Jun 12, 2017 at 5:45 PM, M0LHT <m0lht.huw@...> wrote: is there anyone out there that can help.
i would like the wiring diagram for the agc "idiots guide for non technical muppet" and pictures. i have read that lots of people have done this with great success but unable to find instructions or pictures just the you tube link. and where to fit it in the bitx40.
any help would be brilliant.
Huw.
|
Ok! O have inserted a 22p in the c102 and a variable trimmer up to from 5 up to 60p i will check it out!? 
|
WANTED VK3YE LED LDR AGC diagram
is there anyone out there that can help.
i would like the wiring diagram for the agc "idiots guide for non technical muppet" and pictures. i have read that lots of people have done this with great success but unable to find instructions or pictures just the you tube link. and where to fit it in the bitx40.
any help would be brilliant.
Huw.
|
Re: Replacing power regulator with Murata linear supply
The Murata is not a good choice for most. ?It's called a "linear regulator replacement", actually a buck mode switcher. ?Would supply 5v to the Raduino at about twice the efficiency of our LM7805 (so worth looking into if you are running off of batteries), but likely produces a fair bit of radio noise unless well shielded and with appropriate bypass caps and fillters.
I have unsoldered the LM7805 from my raduino and installed one by laying it flat on the back side of the board. ?The tab of the LM7805 can be ground, I have soldered mine to the copper ground plane on the back side of the Raduino.to better distribute any heat. ? It's the tab of the IRF510 that cannot touch ground, it's typically up around 12vdc while transmitting, and will have lots of RF riding on top of that.
Jerry, KE7ER
toggle quoted message
Show quoted text
On Mon, Jun 12, 2017 at 08:43 am, Geoff Lowe wrote:
first off, thanks to everyone in the Bitx community for their advice and input on improving the design and functioning of the Bitx40.
Has anyone looked into replacing the 7805 with a Murata linear supply like this one: ? I've used this in a few other applications and it runs very cool, even with 15+VDC input. It's a pin-for-pin replacement to the 7805 except the pins are in the reverse order.
The case I have places the VR and heat sink very close to the metal side and I thought that if it gets hot or bumped the heat sink will short to the case, something Ashar says is a no-no! Replacing the VR with the linear unit should cut down on the heat generated, plus a plastic film on the case by the heat sink will prevent the short, without worrying about the heat dislodging the plastic film.
Thanks.
?
|
Has anyone figured out how to use other bands to transmit? ?I have built bandpass filters and can't seem to get a the swr tuned when not using the 40 bandpass filter. ?my c91 and 92 are removed I can hear just fine but can't get the swr under control. ?Everything works great when using the 40 M filter thats onboard.
|
Re: Replacing power regulator with Murata linear supply
I have used those on robotics and digital projects and quite like
them. Before I'd put one in a radio though I would put one under a
load and see how RF noisy it is as those are switchers. Over all I
think I'd stick with a linear regulator unless low power consumption
during stand by was paramount.
KK6RPX
On 6/12/2017 8:43 AM, Geoff Lowe wrote:
toggle quoted message
Show quoted text
first off, thanks
to everyone in the Bitx community for their advice and input on
improving the design and functioning of the Bitx40.
Has anyone looked into replacing the 7805 with a Murata linear
supply like this one: ?
I've used this in a few other applications and it runs very cool,
even with 15+VDC input. It's a pin-for-pin replacement to the 7805
except the pins are in the reverse order.
The case I have places the VR and heat sink very close to the
metal side and I thought that if it gets hot or bumped the heat
sink will short to the case, something Ashar says is a no-no!
Replacing the VR with the linear unit should cut down on the heat
generated, plus a plastic film on the case by the heat sink will
prevent the short, without worrying about the heat dislodging the
plastic film.
Thanks.
|
Replacing power regulator with Murata linear supply
first off, thanks to everyone in the Bitx community for their advice and input on improving the design and functioning of the Bitx40.
Has anyone looked into replacing the 7805 with a Murata linear supply like this one: ? I've used this in a few other applications and it runs very cool, even with 15+VDC input. It's a pin-for-pin replacement to the 7805 except the pins are in the reverse order.
The case I have places the VR and heat sink very close to the metal side and I thought that if it gets hot or bumped the heat sink will short to the case, something Ashar says is a no-no! Replacing the VR with the linear unit should cut down on the heat generated, plus a plastic film on the case by the heat sink will prevent the short, without worrying about the heat dislodging the plastic film.
Thanks.
|
Re: BITX QSO Night, Sunday, June 11, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere
Worked California from Rhode Island during a very short opening at what was probably near their sunset 02:50z. ? N6QW,Pete,,who appears to be a QRP GURU, came thru quite strong running what he said was a DifX( decidedly Different than a BitX). home brew rig. Check out his QRZ page. You will be amazed at the Rigs he has .
I then had a busted QSO with ND6T.Don,also in CA but conditions were less than ideal and only got parts of his transmission. If you want to work the left coast try around 03:00z
Had ?Q's with 9 stations last night running 5 +/- watts into an inverted V @ 50 feet but conditions were challenging .QRM QRN QSB ?and except for the short opening to the West coast,disappointing.?
73, Willy W1LY
On Mon, Jun 12, 2017 at 10:08 AM, Sean Barton via Groups.Io <kb0ovd@...> wrote: I was late coming in at around 7:30.? I faintly heard W1LY (or maybe someone who was in QSO with him) and then heard AD0RW call CQ but I think someone picked him up.? Not long after the QRM came in and covered them up so I shut it down.
Sean KB0OVD
no luck here .... have someone on a langue I do not understand here with 9++?
|
I'm not so sure, schematic shows that +12 goes into pin 8 on both K1 and K2.
toggle quoted message
Show quoted text
On Sun, Jun 11, 2017 at 11:41 pm, Raj vu2zap wrote:
BITX40's both relays are wired opposite of each other.
?
|
Re: BITX QSO Night, Sunday, June 11, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere
I was late coming in at around 7:30.? I faintly heard W1LY (or maybe someone who was in QSO with him) and then heard AD0RW call CQ but I think someone picked him up.? Not long after the QRM came in and covered them up so I shut it down.
Sean KB0OVD
On Monday, June 12, 2017 2:13 AM, OZ9AEW <madsen1960@...> wrote:
no luck here .... have someone on a langue I do not understand here with 9++?
|
Re: Calling West Coast BITX operators
This is the first week I heard anything on 7.277 and it was very very
faint. Couldn't make out anything other than someone was talking. Since
the tower came down there's no antenna near my other HF rig so I couldn't
double check that.
Vince.
toggle quoted message
Show quoted text
I've thought about doing that, too (e.g., using my other rig), but didn't
know if that would be okay or not, so I haven't. I've listened almost
every Sunday and I hear nothing...zilch...nada. I've got 3 acres of ground
but the XYL is adamant about not raising a "visible" antenna. My EFHW
works okay with 100W and 41 stages in the RF/AF stages, but I am not doing
well here with the B40. I'll keep trying...
Jack, W8TEE
From: Keith VE7GDH <ve7gdh@...>
To: [email protected]
Sent: Sunday, June 11, 2017 11:40 PM
Subject: Re: [BITX20] Calling West Coast BITX operators
I had a QSO with Don ND6T in California about half
an hour early... my first one with someone using a
BITX40! I'm still waiting for my BITX40, so I was
running 100W. Don was fairly weak... about 43.
I later heard K7RTV, KG7UMW and N6QW although I
thought I heard him saying he was not QRP. I heard
ND6T again in a QSO during which he peaked up to 59.
There were quite a few weaker stations whose call
signs I couldn't copy.
--
73 Keith VE7GDH
CN88
| | Virus-free. www.avast.com |
--
Michigan VHF Corp.
|
Re: Calling West Coast BITX operators
I've thought about doing that, too (e.g., using my other rig), but didn't know if that would be okay or not, so I haven't. I've listened almost every Sunday and I hear nothing...zilch...nada. I've got 3 acres of ground but the XYL is adamant about not raising a "visible" antenna. My EFHW works okay with 100W and 41 stages in the RF/AF stages, but I am not doing well here with the B40. I'll keep trying...
Jack, W8TEE
From: Keith VE7GDH <ve7gdh@...>
To: [email protected]
Sent: Sunday, June 11, 2017 11:40 PM
Subject: Re: [BITX20] Calling West Coast BITX operators
I had a QSO with Don ND6T in California about half
an hour early... my first one with someone using a
BITX40! I'm still waiting for my BITX40, so I was
running 100W. Don was fairly weak... about 43.
I later heard K7RTV, KG7UMW and N6QW although I
thought I heard him saying he was not QRP. I heard
ND6T again in a QSO during which he peaked up to 59.
There were quite a few weaker stations whose call
signs I couldn't copy.
--
73 Keith VE7GDH
CN88
|
Don Cantrell's tombstone cap trick at Q1 effectively removes all rx gain before the mixer.
? ?????
Some may require the additional gain of Q1 when working with a less than optimal antenna.
toggle quoted message
Show quoted text
On Sun, Jun 11, 2017 at 11:10 pm, Ashhar Farhan wrote:
it might be a good idea to just remive the rf amps before the mixer. there is too mucb gain for a 7 mhz radio.
?
?
|
Re: Raduino V1.01 vs V1.14 Birdie at 7.200
it have been tried with "hardcode" value, but as it is Band limit is 7,200MHz in Europa ( as you know ) I won't let it destroyed my day !
it will be use as it is until I have another 10 turn pot. at home, the cheap Mexico goes crazy ?on some points !
about confuse ufo and pa level...let us just say I have build arp rig for so many year that it do not happened .... got my class D license back in 1992, and pass cw test back in 1993 and today I have a class A license?
|
I have one of these and it works well.
|
Re: New BITX-40 User and Antenna Recommendations
HI, If your apartment is high enough you can (during darkness) put out the longest fishing pole out of the window that you can manage and drop a wire vertically down. You can feed it with small coax, say RG58, at the end and run another wire back to the shack or to the roof for the other leg of a dipole. Better if you wind a few turns of the coax feeder around a suitable former before it enters through the window to act as a choke to RF current which would be induced in the shield by the other leg coming back to the house. Also if you are high enough and there is something that you can tie the other end to and which is high enough not to be reached or obstruct anyone or any vehicle you can tie the end to it using small gauge wire supported throughout its length with nylon fishing line which will be practically invisible if it is high enough and thin enough. You can also rig an inverted V in this manner if you have two anchor points. You have to use your imagination to see what you can pu up. I used to have a 160 metre dipole in this manner and it was practically invisible from the ground unless you knew about. Regards Lawrence
On Sun, Jun 11, 2017 at 11:12 PM, EA3IAV <Cesarleon@...> wrote: I have this one
good on rx but poor on tx
whizz loop antenna by moonraker
there are two versions starting from 7 or 14mhz
|
Re: New BITX-40 User and Antenna Recommendations
I put a "Hamstick" dipole in the attic. Receives pretty good, but doesn't seem to be transmitting good. I still need to tweak it more, but it's way too hot up there now! I think one of the problems might be that the attic floor is insulated with foil backed insulation and only about 4 1/2 feet below the antenna. That can't be helping. Still trying to come up with a better plan!
--
John - WA2FZW
|
Re: Raduino V1.01 vs V1.14 Birdie at 7.200
On Mon, June 12, 2017 11:22, EA3IAV wrote: I thought drive level was 1mA... during checking of the alignment process
i followed instructions given in hfsignals... this has to be updated as i
have checked over and over in order to soove this (i even thought my
instruments were not ok) ??¡®?
Please don't confuse VFO drive level with PA drive. The drive level I am refering to is the VFO drive level, not the PA drive. The VFO drive level is a software parameter in the SI5351 library, and it controls the output strength of the Raduino VFO. It has nothing to do with alignment of the PA. 73 Allard PE1NWL
|
Re: Raduino V1.01 vs V1.14 Birdie at 7.200
On Mon, June 12, 2017 11:22, EA3IAV wrote: I thought drive level was 1mA... during checking of the alignment process
i followed instructions given in hfsignals... this has to be updated as i
have checked over and over in order to soove this (i even thought my
instruments were not ok) ??¡®?
Please don't confuse VFO drive level with PA drive. The drive level I am refering to is the VFO drive level, not the PA drive. The VFO drive level is a software parameter in the SI5351 library, and it controls the output strength of the Raduino VFO. It has nothing to do with alignment of the PA. 73 Allard PE1NWL
|
Re: Raduino V1.01 vs V1.14 Birdie at 7.200
I thought drive level was 1mA... during checking of the alignment process i followed instructions given in hfsignals... this has to be updated as i have checked over and over in order to soove this (i even thought my instruments were not ok) ?
|
Geoff Lowe
Willy
Allard PE1NWL