Hi Bruce VK4GU Thanks very much for your help .much appreciated .I have a ham friend that is good with down loads .Will try it this week .Will let you know how I go .Thanks again .73 Cheers VK4WBX
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Just wanted to update people on the status of this. We had a delay at the fab house, boards are in product and we hope to have them soon!
I have had a death of a very close friend and will be out of town this coming weekend. If you have any questions please e-mail info@... and Tim or myself will be able to get back with you.
I truly apologize for the delay, we will have more ready once they arrive and we fulfill the pre-orders.
--
David
?N8DAH
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Re: Bitx-40 - Where I Am Today
yeah, it was the same with me. i tried making all kinds of baluns, finally, i made an 'L' tuner for the efhw. it works very well. - f?
Well, for me, I have already spent enough hours of my life
looking at different websites, to find all the pieces parts for a
project (the least enjoyable part of the process). Sometimes, I
will spend more money for an assembled project, and have more time
for radioing. It's the same reason I bought a Bitx-40 with
pre-assembled boards.
Other people may have different reasons.
On 2/24/2019 9:59 PM, Ashhar Farhan
wrote:
Why would you buy it? Just get 66 feet of any wire
from home depot and wind your own transformer.
- f
On Mon 25 Feb, 2019, 3:30 AM
Truffies, < truffies@...>
wrote:
look at;? ?
-----Original Message-----
>From: Donald <donwestpwl@...>
>Sent: Feb 24, 2019 2:37 PM
>To: [email protected]
>Subject: Re: [BITX20] Bitx-40 - Where I Am Today
>
>Pat,
>
>I have heard that end-fed antennas are becoming popular
with RVers.
>Palomar is just one company selling them:
>
>
>
>Their site also has some information on that type of
antenna.
>
>Donald, KB5PWL
>
>
>
>
|
Re: Bitx-40 - Where I Am Today
Well, for me, I have already spent enough hours of my life
looking at different websites, to find all the pieces parts for a
project (the least enjoyable part of the process). Sometimes, I
will spend more money for an assembled project, and have more time
for radioing. It's the same reason I bought a Bitx-40 with
pre-assembled boards.
Other people may have different reasons.
On 2/24/2019 9:59 PM, Ashhar Farhan
wrote:
toggle quoted message
Show quoted text
Why would you buy it? Just get 66 feet of any wire
from home depot and wind your own transformer.
- f
On Mon 25 Feb, 2019, 3:30 AM
Truffies, < truffies@...>
wrote:
look at;? ?
-----Original Message-----
>From: Donald <donwestpwl@...>
>Sent: Feb 24, 2019 2:37 PM
>To: [email protected]
>Subject: Re: [BITX20] Bitx-40 - Where I Am Today
>
>Pat,
>
>I have heard that end-fed antennas are becoming popular
with RVers.
>Palomar is just one company selling them:
>
>
>
>Their site also has some information on that type of
antenna.
>
>Donald, KB5PWL
>
>
>
>
|
Re: Bitx-40 - Where I Am Today
Yep make one!? Super easy and saves you a bunch. Just rebuilt mine today (it was really ugly before) and they works great.? Mine is a 40-10m version so it includes the 100pf cap.
Brad KG5SPR?
On Sun, Feb 24, 2019 at 11:30 PM Ken Hansen < ken@...> wrote: In case you decide to build an end-fed, here's a link to a very popular design that's simple to construct and reportedly works great:
Link:??
eHam Reviews:?? Ken, N2VIP On Feb 24, 2019, at 9:59 PM, Ashhar Farhan < farhanbox@...> wrote: Why would you buy it? Just get 66 feet of any wire from home depot and wind your own transformer. - f
|
Re: Bitx-40 - Where I Am Today
In case you decide to build an end-fed, here's a link to a very popular design that's simple to construct and reportedly works great:
Link:??
eHam Reviews:?? Ken, N2VIP
toggle quoted message
Show quoted text
On Feb 24, 2019, at 9:59 PM, Ashhar Farhan < farhanbox@...> wrote: Why would you buy it? Just get 66 feet of any wire from home depot and wind your own transformer. - f
|
Re: Bitx-40 - Where I Am Today
Right on, and thanks, Ashhar, you invented a wonderful thing in the bitx-40! It will be a simple 66 foot dipole at home!
On Sun, Feb 24, 2019 at 8:59 PM Ashhar Farhan < farhanbox@...> wrote: Why would you buy it? Just get 66 feet of any wire from home depot and wind your own transformer. - f
On Mon 25 Feb, 2019, 3:30 AM Truffies, < truffies@...> wrote:
look at;? ?
-----Original Message-----
>From: Donald <donwestpwl@...>
>Sent: Feb 24, 2019 2:37 PM
>To: [email protected]
>Subject: Re: [BITX20] Bitx-40 - Where I Am Today
>
>Pat,
>
>I have heard that end-fed antennas are becoming popular with RVers.
>Palomar is just one company selling them:
>
>
>
>Their site also has some information on that type of antenna.
>
>Donald, KB5PWL
>
>
>
>
|
Re: Bitx-40 - Where I Am Today
I don't know why many choose to buy, rather than build their own wire antennas...
Here's how to make one>??
On Sunday, February 24, 2019, 10:59:31 p.m. EST, Ashhar Farhan <farhanbox@...> wrote:
Why would you buy it? Just get 66 feet of any wire from home depot and wind your own transformer. - f
On Mon 25 Feb, 2019, 3:30 AM Truffies, < truffies@...> wrote:
look at;? ?
-----Original Message-----
>From: Donald <donwestpwl@...>
>Sent: Feb 24, 2019 2:37 PM
>To: [email protected]
>Subject: Re: [BITX20] Bitx-40 - Where I Am Today
>
>Pat,
>
>I have heard that end-fed antennas are becoming popular with RVers.
>Palomar is just one company selling them:
>
>
>
>Their site also has some information on that type of antenna.
>
>Donald, KB5PWL
>
>
>
>
|
Re: ubitx schematic cleanup
#ubitx
I've updated the page with corrections suggested by Jerry. Having watched the projects for years (time flies) it is fun to look back through the changes. feel free to update/correct it. /g/BITX20/wiki/Ubitx-Schematicstom KF5NWC
|
Re: Bitx-40 - Where I Am Today
Why would you buy it? Just get 66 feet of any wire from home depot and wind your own transformer. - f
On Mon 25 Feb, 2019, 3:30 AM Truffies, < truffies@...> wrote:
look at;? ?
-----Original Message-----
>From: Donald <donwestpwl@...>
>Sent: Feb 24, 2019 2:37 PM
>To: [email protected]
>Subject: Re: [BITX20] Bitx-40 - Where I Am Today
>
>Pat,
>
>I have heard that end-fed antennas are becoming popular with RVers.
>Palomar is just one company selling them:
>
>
>
>Their site also has some information on that type of antenna.
>
>Donald, KB5PWL
>
>
>
>
|
Re: Initial spectrum test on the V5 with my new spectrum analyzer
#ubitx
I think ?is equivalent to 0.001 watt into 50 ohms.?
toggle quoted message
Show quoted text
On Feb 24, 2019, at 7:21 PM, Mark McNabb < n7eku@...> wrote: Hi,
Can it do better than 1MHz RBW?
Do you have an external attenuator on it?? The display only shows 20dB which at 0dBm would be 0.1W input I think.
Power measurement would be better done on 'scope, diode probe, or wattmeter.
73,
Mark.
|
Re: Initial spectrum test on the V5 with my new spectrum analyzer
#ubitx
Jim
Nice work with the new instrument.? I don't think too many of us are concerned with the frequency accuracy, relative measurements of spurious are wonderful data.
Sure start with cw, but if you have a simple audio oscillator (I use the one on 4stateqrp rf test set) others will be curious on the ssb path.
73 Curt
|
Re: Initial spectrum test on the V5 with my new spectrum analyzer
#ubitx
Hi Jim,
Good for the sampler -- wanted to make sure I was reading the pictures correctly as the print is a bit small (and doing my math correctly).
Yes, I understand you are checking for harmonics. You mentioned calibration so that got me thinking you were concerned about power accuracy.? My mistake.
If interested, you can check your results against mine.? In the files section I have a spreadsheet under my callsign with harmonics and power out measurements.
Also in the photos section under my callsign, I posted pictures of my SA measurement screen.? In all pictures I centered the fundamental near the zero reference line (2nd peak from the left).? I used a 20dB power attenuator then a selectable low power attenuator as needed.? These measurements were done with CW as well.? On a v3 board as delivered.
My 20m looked a lot different from yours.? 80, 40, and 30m showed a lot of upper harmonics getting past the LPF -- probably why there are alternate filter plans for these now and a new layout I think on your v4 board...?? There's less of this on 20m and above, but there's also way way less power.? Power max was 14.5W on 75m and goes down to 0.7W on 10m.
73,
Mark - N7EKU
|
|
|
Re: Initial spectrum test on the V5 with my new spectrum analyzer
#ubitx
I did not want to comment first, as I was not sure that i was interpreting the results correctly.? Based on Ashhar's comments, I was correct in that the what was a 40 meter problem is now a 20 meter problem.? I do not have a good SA, closest is an SDRPlat with beta software, so not sure that I will be able to verify the results.? I am to receive my v5 board this week.? Hopefully will get time to test it next weekend.
73
Evan
AC9TU
|
Re: Initial spectrum test on the V5 with my new spectrum analyzer
#ubitx
Bench is shut down for the night. ?I planned on re-running the tests tomorrow.
Jim?
toggle quoted message
Show quoted text
On Feb 24, 2019, at 7:58 PM, Ashhar Farhan < farhanbox@...> wrote: Twenty looks terrible. You may have to increase the attenuation a bit and crank down the bandwidth to 10khz or 30khz to show up the crud hiding in the grass. Can you do a second pass on twenty? Keep the fundamental peak to -20 dbm. On Mon 25 Feb, 2019, 7:02 AM Tim Gorman, < tgorman2@...> wrote: Nice job.
It looks like all the bands except 20m are pretty good. I assume this
was straight cw. I don't see any spurs.
It would be interesting to see the same sweeps with an audio tone
feeding the microphone for the same output levels. That would get all
the mixers into play as well.
I assume you are going to do two-tone and carrier suppression tests at
some point? I'm waiting on my v5 to come. I ordered back on 2/7 like
Ron did but I've not heard anything on it. When I get it going I'll
duplicate your measurements using my less expensive Rigol 815!
tim ab0wr
On Sun, 24 Feb 2019 14:24:04 -0800
"Jim Sheldon" <w0eb@...> wrote:
> My wife was very nice to me and bought me a brand new Siglent SSA
> 3021X spectrum analyzer for my upcoming 77th birthday.
>
> I have 1 Version 5 uBITX and another on the way.? The one I have I
> built up on my old, ugly open frame aluminum chassis for ease of
> getting at test points, etc.? I did not do a power output check, but
> during my spectral purity tests into a 20 watt dummy load, it was
> warming up the load pretty good even on 10 meters with the power
> control right where the factory set it.
>
> Attached pictures are screen saves from the spectrum analyzer in .jpg
> format as they were being measured.? No editing has been done on any
> of them.? As I was uploading the pictures, I realized I did not save
> pictures for 30 and 12 meters so I'll re-do them and post the results
> at a later date.? These are posted "as-is" for people to see and make
> their own conclusions from them.?
>
> Though I got a calibration certificate with it from the Siglent
> factory, I don't know how far I can trust that.? I do have a GPS
> Disciplined oscillator feeding the 10 MHz external reference.? As I
> get more experience with the SA, I may be able to get closer
> indications that this first run, right out of the box.
>
> Jim Sheldon, W0EB
> TSW Project Coordinator
>
>
>
|
Re: Initial spectrum test on the V5 with my new spectrum analyzer
#ubitx
I'll let someone else do those. I only operate CW myself and don't even have a microphone made up for any of my uBITX rigs.
toggle quoted message
Show quoted text
On Feb 24, 2019, at 7:31 PM, Tim Gorman <tgorman2@...> wrote:
Nice job.
It looks like all the bands except 20m are pretty good. I assume this
was straight cw. I don't see any spurs.
It would be interesting to see the same sweeps with an audio tone
feeding the microphone for the same output levels. That would get all
the mixers into play as well.
I assume you are going to do two-tone and carrier suppression tests at
some point? I'm waiting on my v5 to come. I ordered back on 2/7 like
Ron did but I've not heard anything on it. When I get it going I'll
duplicate your measurements using my less expensive Rigol 815!
tim ab0wr
On Sun, 24 Feb 2019 14:24:04 -0800
"Jim Sheldon" <w0eb@...> wrote:
My wife was very nice to me and bought me a brand new Siglent SSA
3021X spectrum analyzer for my upcoming 77th birthday.
I have 1 Version 5 uBITX and another on the way. The one I have I
built up on my old, ugly open frame aluminum chassis for ease of
getting at test points, etc. I did not do a power output check, but
during my spectral purity tests into a 20 watt dummy load, it was
warming up the load pretty good even on 10 meters with the power
control right where the factory set it.
Attached pictures are screen saves from the spectrum analyzer in .jpg
format as they were being measured. No editing has been done on any
of them. As I was uploading the pictures, I realized I did not save
pictures for 30 and 12 meters so I'll re-do them and post the results
at a later date. These are posted "as-is" for people to see and make
their own conclusions from them.
Though I got a calibration certificate with it from the Siglent
factory, I don't know how far I can trust that. I do have a GPS
Disciplined oscillator feeding the 10 MHz external reference. As I
get more experience with the SA, I may be able to get closer
indications that this first run, right out of the box.
Jim Sheldon, W0EB
TSW Project Coordinator
|
Re: Initial spectrum test on the V5 with my new spectrum analyzer
#ubitx
Twenty looks terrible. You may have to increase the attenuation a bit and crank down the bandwidth to 10khz or 30khz to show up the crud hiding in the grass. Can you do a second pass on twenty? Keep the fundamental peak to -20 dbm.
On Mon 25 Feb, 2019, 7:02 AM Tim Gorman, < tgorman2@...> wrote: Nice job.
It looks like all the bands except 20m are pretty good. I assume this
was straight cw. I don't see any spurs.
It would be interesting to see the same sweeps with an audio tone
feeding the microphone for the same output levels. That would get all
the mixers into play as well.
I assume you are going to do two-tone and carrier suppression tests at
some point? I'm waiting on my v5 to come. I ordered back on 2/7 like
Ron did but I've not heard anything on it. When I get it going I'll
duplicate your measurements using my less expensive Rigol 815!
tim ab0wr
On Sun, 24 Feb 2019 14:24:04 -0800
"Jim Sheldon" <w0eb@...> wrote:
> My wife was very nice to me and bought me a brand new Siglent SSA
> 3021X spectrum analyzer for my upcoming 77th birthday.
>
> I have 1 Version 5 uBITX and another on the way.? The one I have I
> built up on my old, ugly open frame aluminum chassis for ease of
> getting at test points, etc.? I did not do a power output check, but
> during my spectral purity tests into a 20 watt dummy load, it was
> warming up the load pretty good even on 10 meters with the power
> control right where the factory set it.
>
> Attached pictures are screen saves from the spectrum analyzer in .jpg
> format as they were being measured.? No editing has been done on any
> of them.? As I was uploading the pictures, I realized I did not save
> pictures for 30 and 12 meters so I'll re-do them and post the results
> at a later date.? These are posted "as-is" for people to see and make
> their own conclusions from them.?
>
> Though I got a calibration certificate with it from the Siglent
> factory, I don't know how far I can trust that.? I do have a GPS
> Disciplined oscillator feeding the 10 MHz external reference.? As I
> get more experience with the SA, I may be able to get closer
> indications that this first run, right out of the box.
>
> Jim Sheldon, W0EB
> TSW Project Coordinator
>
>
>
|
Re: Initial spectrum test on the V5 with my new spectrum analyzer
#ubitx
Nice job. It looks like all the bands except 20m are pretty good. I assume this was straight cw. I don't see any spurs. It would be interesting to see the same sweeps with an audio tone feeding the microphone for the same output levels. That would get all the mixers into play as well. I assume you are going to do two-tone and carrier suppression tests at some point? I'm waiting on my v5 to come. I ordered back on 2/7 like Ron did but I've not heard anything on it. When I get it going I'll duplicate your measurements using my less expensive Rigol 815! tim ab0wr On Sun, 24 Feb 2019 14:24:04 -0800 "Jim Sheldon" <w0eb@...> wrote: My wife was very nice to me and bought me a brand new Siglent SSA
3021X spectrum analyzer for my upcoming 77th birthday.
I have 1 Version 5 uBITX and another on the way.? The one I have I
built up on my old, ugly open frame aluminum chassis for ease of
getting at test points, etc.? I did not do a power output check, but
during my spectral purity tests into a 20 watt dummy load, it was
warming up the load pretty good even on 10 meters with the power
control right where the factory set it.
Attached pictures are screen saves from the spectrum analyzer in .jpg
format as they were being measured.? No editing has been done on any
of them.? As I was uploading the pictures, I realized I did not save
pictures for 30 and 12 meters so I'll re-do them and post the results
at a later date.? These are posted "as-is" for people to see and make
their own conclusions from them.?
Though I got a calibration certificate with it from the Siglent
factory, I don't know how far I can trust that.? I do have a GPS
Disciplined oscillator feeding the 10 MHz external reference.? As I
get more experience with the SA, I may be able to get closer
indications that this first run, right out of the box.
Jim Sheldon, W0EB
TSW Project Coordinator
|
Re: Initial spectrum test on the V5 with my new spectrum analyzer
#ubitx
Yes it has an external 50 ohm RF sampler with a variable attenuator. ?I'm measuring the harmonics relative to the RF carrier, not output power here. ?Checking spectral purity.?
toggle quoted message
Show quoted text
On Feb 24, 2019, at 6:21 PM, Mark McNabb < n7eku@...> wrote: Hi,
Can it do better than 1MHz RBW?
Do you have an external attenuator on it?? The display only shows 20dB which at 0dBm would be 0.1W input I think.
Power measurement would be better done on 'scope, diode probe, or wattmeter.
73,
Mark.
|
N8DAH
VE3MIC
AA9GG
Jim Sheldon