I'm not so sure, schematic shows that +12 goes into pin 8 on both K1 and K2.
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On Sun, Jun 11, 2017 at 11:41 pm, Raj vu2zap wrote:
BITX40's both relays are wired opposite of each other.
?
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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++?
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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.
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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.
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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
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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.
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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.
?
?
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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?
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I have one of these and it works well.
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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
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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
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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
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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
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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) ?
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Re: VK and ZL group buy of Jack W8TEE VFO boards
Ok Martin, you are
on the list.
Bill, VK7MX
On 12/06/2017 10:48 AM, martin Fraser
wrote:
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Count me in on 2 please
Regards martin?
VK6FEEE
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Re: VK and ZL group buy of Jack W8TEE VFO boards
No worries Andrew,
Thanks
Bill, VK7MX
On 12/06/2017 10:17 AM, Andrew
Merrybard wrote:
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Hi Bill,
I have a stock
Bitx 40 waiting for me to get back into the shack to mod.
My other
hobbies are taking my time ... well that and work :-)
I also have one
of Jacks boards and ordered an other board last night.
Just waiting on
the final parts to get to work.
I thought I
would stick my oar in, because I will want the next boards
being
developed, so while I will not be ordering this way this time,
I will in
future.
Thanks for
working this our for us !
Best wishes
Andrew VK6WAM
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Re: Raduino V1.01 vs V1.14 Birdie at 7.200
On Mon, June 12, 2017 09:10, OZ9AEW wrote: bitx is 100% stock except from a 7808 with .1uf and 2200uf on both input
and output placed between on/off and Raduino board, it reduce tuning click
to nearly nothing, but that 7.200MHz Birdie is really strong !
I have think about rewire everything with shielded cable and solder them
instead of use connectors Adding capacitors as you did can indeed reduce the tuning click issues, but will not have an effect on the 7199 kHz birdie. Regarding the birdie: Have you already tried different VFO drive levels? In early raduino versions the drive level was set to 2mA, as from v1.05 the default became 4mA but you change change it in the SETTINGS menu (possible values are 2,4,6,8mA). The correct setting of the drive level can have a great effect on the strength of the birdie in LSB mode. It seems there is some variability between BitX radios, most have best results with 4mA but in some cases a different value is better. 73 Allard PE1NWL
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Have you got the diagram for the interface by any chance and has anyobe heard about the release date for the uBitx yet
On 12 Jun. 2017 4:11 pm, "Ashhar Farhan" < farhanbox@...> 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.
- f
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Re: BITX QSO Night, Sunday, June 11, 7pm Local Time, 7277 kHz in North America, 7177 kHz elsewhere
no luck here .... have someone on a langue I do not understand here with 9++?
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Re: Raduino V1.01 vs V1.14 Birdie at 7.200
bitx is 100% stock except from a 7808 with .1uf and 2200uf on both input and output placed between on/off and Raduino board, it reduce tuning click to nearly nothing, but that 7.200MHz Birdie is really strong !
I have think about rewire everything with shielded cable and solder them instead of use connectors
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Checked the relay Virtual VRS2H on my board is not polarised.
I have some other brands, checked one I had handy a Panasonic and it is
polarised.
BITX40's both relays are wired opposite of each other.
At 12-06-2017, you wrote:
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You're probably right.
So Matt's TX rail probably never saw power during the mishap, and none of
those parts behind it got damaged.
We're assuming it was a battery lead reversal that blew D7.
?
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On Sun, Jun 11, 2017 at 08:49 pm, Raj vu2zap wrote:
- The relays are polarized type, they have a magnet inside to reduce
operating current.
- They wont operate with reversed voltage.
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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.
- f
On 12 Jun 2017 11:37 a.m., "Jerry Gaffke via Groups.Io" <jgaffke= [email protected]> wrote: If incoming signals are too strong to go through the receiver without distortion, you need to reduce the gain.? The bitx40 has an audio gain control already, that happens at the tail end of the radio.? For really strong signals, we're better off with an RF gain control, RF gain happens at the front end of the receiver near the antenna.? That way we don't overload all those parts of the receiver that happen before the audio gain control.
The first link talks about many different methods of gain control, including two methods of RF gain control.? The one by Don Cantrell where you mess with power into the existing amplifier at Q1 is an elegant solution that probably works just fine.? The second link is Don's blog post about it.? The second RF gain control method is described in post 20538 and 20541 where you add a 10k pot between K2 pin 14 and K1 pin 12, that is a trace that is only used during receive and not during transmit.? The second method is a bit harder to do well, because if you mount the 10k RF gain pot on the front panel it really should have two pieces of coax off to where you cut that trace between K1 and K2 since it is sometimes dealing directly with an extremely low level received signal from the antenna.
Adding a 240 ohm resistor at the antenna might work well enough if you have an antenna tuner between that and the rig to match the rig's 50 ohm transmitter.? I suppose if you are talking to somebody close you want to reduce transmitted power anyway.? But you will be wasting most of the power from the transmitter, better to reduce mike gain (or R136) if you want to cut transmitter power.
?
Jerry
On Sun, Jun 11, 2017 at 10:13 pm, John Smith wrote:
Your first link was about amplified audio, and the second was more like what I am talking about with attenuation of RF. When a strong station comes on, they sound distortedly loud even when I turn the volume almost all the way down. My experiment with the resistor softened them enough to eliminate the distortion and sound like most other stations. And I like the audio gain as is from stock. I need it for QSO night.?
On that second link, do you have other ideas along these lines? Or is that my best bet?
?
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Allard PE1NWL
Raj vu2zap