I uploaded a spreadsheet of my measurements for my ubitx for 80,40,30,20, and 10m:
? 1. Stock
? 2. Replaced L5/L7 with SMD inductors I found locally, kept C211 in circuit
? 3. Replaced the relays
? 4. Replaced the inductors with the specified Murata parts
? 5. Bypassed C211 per the mod



The mods I used:?
Both helped.

To desolder the relays, I used a piece of desoldering stick,
a low temp alloy along with solder wick and a hot
tip on the iron, made easy work of it.? Cleanup was the worst bit.
Probably about the same as:

I'll probably put the cap back in the circuit to get 30m.

I still need to find a solution for 80m.

Check out Dan's kits and parts.com for these 2N2222's in metal cans. He did have some JAN (military grade) available.

Allison,
Thank you for the heads up. The price was right so I'll try them. If I'm not happy with the output I'll do the cans.This is a learning process for me and as I told someone else: this is a train ride, a bit bumpy but the destination is great.
Jon S

I started full clockwise after I realized what was wrong. A couple 510s sacrificed

And TABS!!

;-)

73
John
N6API


Sent from my iPhone 6!
John J. Bahun
Senior Software / Hardware Engineer - Retired (Apple DTS)
Amateur Radio Operator - N6API Extra Class!

Note for others not as expereonced with the compile stuff.

If you code on Windows it wont care about case.
Linux Does, so use Case carefully on Windows, f the file has uppercase
use it in your code then it will be portable to Linux too.

i.e. if the include file is Arduino.h Windows will find it, even if
you have #include <arduino.h>
Linux would need to rename the filename to #include <Arduino.h>

Linux is case sensitive
arduino.h needs to become Arduino.h, likely that is your issue.

I modified them and built it for you.




On Mon, Mar 18, 2019 at 8:37 PM Mike via Groups.Io
<mikeymustang2000@...> wrote:

Does anyone have the hex file for this ? I am unable to get this to compile.

Thank you
Mike WA3O

Does anyone have the hex file for this ? I am unable to get this to compile.

Thank you
Mike WA3O

I bought two of these for my 2 uBITX Version 5 radios. ?First off, the directions for installing this board are brief but they are easily followed and the boards are easy to install.

Not wanting to drill a hole for the included switch and run a bunch of wires to it, I just wired the common pad to the "fast" pad for always on, Fast AGC. ?I found a "Via" hole in the trace between R70 and "Vol HI" and ran a wire from there to the "VOL" pad on the AGC board which worked great.

Even though the "S-meter" output of this AGC system was designed to work with the CEC software, we found it worked with TSW's BITeensio board as well. ?We use the A19 analog input on the Teensy 3.6 for the S-meter and this little AGC system drives our S-meter routines just fine. ?I fed a 50 microvolt (-73 dBm) signal into the antenna connector and adjusted the software's S-meter routine's division ratio so the touch screen's display read S9 as it should. ?The rest of the S units were so close to correct no further tweaking was deemed necessary.

I also found that adjusting the on board RF gain control for max recieved signal was the best way to do it. ?As you turn the control counter clockwise, the gain increases and there is a point past which saturation occurs. ?This is obvious when listening to a weak signal and you can hear the gain drop past this point. ?Adjust it to that point and turn it back to where the signal just peaks. ?Best to just leave it there if you want your S-meter to work right. ?Once adjusted, this little AGC board keeps the RF input nicely within bounds on strong signals quite well.

ND6T, N8DAH, well done guys, well done! ?The kit is certainly worth the price IMO.

Jim Sheldon, W0EB
TSW Project Coordinator

I got carried away a bit.
Point was that measuring voltage across a diode to determine power consumed
is just not going to work.??

A 700mv pk-pk sine wave into 50 ohms is indeed around 1dBm though.

Jerry

开云体育

Sam did you turn VR2 & 3 CCW to zero, if you did that is incorrect and you will pop your finals on power-up. You needed to start at full Clockwise on both controls, that is the zero volt starting point for final bias.

Took pot luck back in the early 80's?
once I realized my then advanced class license
qualified me for a shorter call.?

Had been WA7WDK (prior to that, WN7WDK).
That final "K" always bugged me when sending CW,
would have been happy to take most anything else they might have.

Jerry, KEYER

.

Hmm,

The ebay seller may say they are, but the Epcos datasheet doesn't say that.? It states that it is wire wound on a ceramic core.? The only shielded one I saw in the series was the ones for power supplies made with a cup core.

Anyway, I wonder if shielding has much to do with any improvement.? More likely due to the small size, installed orientation, or low Q factor.? It could easily be checked by cutting one apart though.?

How many confirmed measurements on different boards (before and after with no other changes using an SA) have been shown for this change??

73,


Mark.

Jerry
Whenever I see your Call Sign my Eyes read it as Keyer :)
Even though its KE7ER

Nice call sign to have for sure.

On Mon, Mar 18, 2019 at 5:38 PM Jerry Gaffke via Groups.Io
<jgaffke@...> wrote:

Here's a couple designs sort of like what Jim describes.
Though I would not call them superhetrodyne.

This one is described in sufficient detail that you might be able to build something similar:

It sends a signal into the unit under test,
and then analyzes the voltage and current using two mixers.
The local oscillator for the mixers is always 1khz away from the signal into the unit under test.

K5BCQ offers a "Vector Impedance Analyzer" kit that operates on the same principle.
you'll find it at the bottom of this webpage:
K5BCQ has been active in this forum.

The W5BIG design uses DDS chips to create sine waves 1khz apart, one for the unit under test and one for the LO.
The K5BCQ kit uses an si5351 to create square waves 3khz apart, we don't care about the harmonics since
the beat note between harmonics is greater than 3khz, and easily filtered out by DSP firmware.

Jerry, KE7ER

On Mon, Mar 18, 2019 at 12:57 PM, Tom, wb6b wrote:

A while ago I was trying to understand how one of the superheterodyne antenna analyzers worked without some kind of phase detector working at RF frequencies and was finally able to find a description that it involved modulating the RF signal source with a couple of audio tones, if I recall correctly, and measuring the phase of the demodulated tones. Very clever those analog folks.

Here's a couple designs sort of like what Jim describes.
Though I would not call them superhetrodyne.

This one is described in sufficient detail that you might be able to build something similar:
? ??
It sends a signal into the unit under test,
and then analyzes the voltage and current using two mixers.
The local oscillator for the mixers is always 1khz away from the signal into the unit under test.

K5BCQ offers a "Vector Impedance Analyzer" kit that operates on the same principle.
you'll find it at the bottom of this webpage:? ?
K5BCQ has been active in this forum.

The W5BIG design uses DDS chips to create sine waves 1khz apart, one for the unit under test and one for the LO.
The K5BCQ kit uses an si5351 to create square waves 3khz apart, we don't care about the harmonics since
the beat note between harmonics is greater than 3khz, and easily filtered out by DSP firmware.?

Jerry, KE7ER

That's interesting. I hope someone who if familiar with these knows and could shed some light.

A while ago I was trying to understand how one of the superheterodyne antenna analyzers worked without some kind of phase detector working at RF frequencies and was finally able to find a description that it involved modulating the RF signal source with a couple of audio tones, if I recall correctly, and measuring the phase of the demodulated tones. Very clever those analog folks.?

Tom, wb6b