|
Active Low Modification for QCX 50W Amp
#mods
Thank you, Bojan! 73! Simon
Thank you, Bojan! 73! Simon
|
By
Simon
· #97352
·
|
|
Active Low Modification for QCX 50W Amp
#mods
Hi, my version of PTT to GND is this, however it requires the connection to the ring to be disconnected on the PCB. So, either +5V PTT at the ring or GND PTT at the tip of X2. 73 Bojan S53DZ
Hi, my version of PTT to GND is this, however it requires the connection to the ring to be disconnected on the PCB. So, either +5V PTT at the ring or GND PTT at the tip of X2. 73 Bojan S53DZ
|
By
bojan.naglic
· #97328
·
|
|
Active Low Modification for QCX 50W Amp
#mods
On Fri, Feb 21, 2020 at 03:50 AM, ND6P wrote: Jim Dr Jim, Do you mind sharing the schematic/pictures again? Groups.io doesn't seem to store the files for a longer period and I'm currently looking into
On Fri, Feb 21, 2020 at 03:50 AM, ND6P wrote: Jim Dr Jim, Do you mind sharing the schematic/pictures again? Groups.io doesn't seem to store the files for a longer period and I'm currently looking into
|
By
Simon
· #97303
·
|
|
UPDATE - SigGen Attenuator Modifications
#mods
Hi Rick, Thanks for the update. I have 5 of the ZL2PD boards coming and will try the 3dB pad in front of it. I also may still try my 15dB gain termination insensitive amplifier and see how that looks,
Hi Rick, Thanks for the update. I have 5 of the ZL2PD boards coming and will try the 3dB pad in front of it. I also may still try my 15dB gain termination insensitive amplifier and see how that looks,
|
By
Gregg Myers
· #96203
·
|
|
UPDATE - SigGen Attenuator Modifications
#mods
I have made some changes to the SigGen interface to the variable attenuator. Originally I used a blocking capacitor and a unun. I have now switched to a blocking capacitor and a simple 50 ohm impedanc
I have made some changes to the SigGen interface to the variable attenuator. Originally I used a blocking capacitor and a unun. I have now switched to a blocking capacitor and a simple 50 ohm impedanc
|
By
Rick Williams - VE7TK
· #96111
·
|
|
SigGen Variable Attenuator Mod/Addition
#mods
Hi Rick, Thanks for the additional data. I will do some experimentation on my SigGen here and see what I can do to improve the output consistency. The ZL2PD attenuator looks very interesting, too, and
Hi Rick, Thanks for the additional data. I will do some experimentation on my SigGen here and see what I can do to improve the output consistency. The ZL2PD attenuator looks very interesting, too, and
|
By
Gregg Myers
· #95910
·
|
|
SigGen Variable Attenuator Mod/Addition
#mods
Gregg I have put together a couple of quick graphs (my apologies in advance for the poor quality). The first is the SigGen output at 1 MHz increments from 3 to 28 MHz. Not quite as flat as Hans' with
Gregg I have put together a couple of quick graphs (my apologies in advance for the poor quality). The first is the SigGen output at 1 MHz increments from 3 to 28 MHz. Not quite as flat as Hans' with
|
By
Rick Williams - VE7TK
· #95902
·
|
|
SigGen Variable Attenuator Mod/Addition
#mods
Dear Rick, Thanks for the comments on the QRP Labs Signal Generator. I am going to incorporate them into mine. Your email is giving me the boost to get it done. It is a great unit. this just makes it
Dear Rick, Thanks for the comments on the QRP Labs Signal Generator. I am going to incorporate them into mine. Your email is giving me the boost to get it done. It is a great unit. this just makes it
|
By
David R. Hassall WA5DJJ
· #95876
·
|
|
SigGen Variable Attenuator Mod/Addition
#mods
Hi Rick, I also saw highly variable output level on my SigGen with 6 LPF filter board combo, depending on the frequency. I tried using a single BS170 buffer, but still got quite a variation in output
Hi Rick, I also saw highly variable output level on my SigGen with 6 LPF filter board combo, depending on the frequency. I tried using a single BS170 buffer, but still got quite a variation in output
|
By
Gregg Myers
· #95868
·
|
|
SigGen Variable Attenuator Mod/Addition
#mods
With ZL2PD Andrew's permission, I have uploaded his Variable Attenuator file to the Signal Generator folder in the files section.
With ZL2PD Andrew's permission, I have uploaded his Variable Attenuator file to the Signal Generator folder in the files section.
|
By
Rick Williams - VE7TK
· #95866
·
|
|
SigGen Variable Attenuator Mod/Addition
#mods
FYI in the current schematic J3 and J4 are reversed. J4 is the 12 VDC input.on the PCB.
FYI in the current schematic J3 and J4 are reversed. J4 is the 12 VDC input.on the PCB.
|
By
Rick Williams - VE7TK
· #95865
·
|
|
SigGen Variable Attenuator Mod/Addition
#mods
I couldn't get it to work 5 minutes ago BUT it looks like the site is back!
I couldn't get it to work 5 minutes ago BUT it looks like the site is back!
|
By
Rick Williams - VE7TK
· #95864
·
|
|
SigGen Variable Attenuator Mod/Addition
#mods
The website link for ZL2PD loads very slowly, but eventually worked for me. See his schematic, attached. 73, Gregg W7GRM
The website link for ZL2PD loads very slowly, but eventually worked for me. See his schematic, attached. 73, Gregg W7GRM
|
By
Gregg Myers
· #95863
·
|
|
SigGen Variable Attenuator Mod/Addition
#mods
That looks like an excellent piece of work. Unfortunately I couldn't get the ZL2PD website to work. Roy WA0YMH
That looks like an excellent piece of work. Unfortunately I couldn't get the ZL2PD website to work. Roy WA0YMH
|
By
Roy Appleton
· #95861
·
|
|
SigGen Variable Attenuator Mod/Addition
#mods
I've just completed some mods to the QRP-Labs HF SigGen kit. They include a simple buffer/impedance matching mod (suggest by ZL1UJG) and the addition of a variable attenuator. The attenuator, designed
I've just completed some mods to the QRP-Labs HF SigGen kit. They include a simple buffer/impedance matching mod (suggest by ZL1UJG) and the addition of a variable attenuator. The attenuator, designed
|
By
Rick Williams - VE7TK
· #95858
·
|
|
QCX+ Disable Keyer TX
#mods
#qcx
Larry and Curt Thank you for the excellent information. My tone memory isn't as good as I'd like but to Curts point perhaps my perception of operation etiquit was incorrect. I always thought it was go
Larry and Curt Thank you for the excellent information. My tone memory isn't as good as I'd like but to Curts point perhaps my perception of operation etiquit was incorrect. I always thought it was go
|
By
Bryan Curl
· #83195
·
|
|
QCX+ Disable Keyer TX
#mods
#qcx
I concur that the IF pass and is narrow enough that your signal should arrive in the other station's receiver. Yes some rigs do have a visual indicator of zero beat and there may be kits available. Bu
I concur that the IF pass and is narrow enough that your signal should arrive in the other station's receiver. Yes some rigs do have a visual indicator of zero beat and there may be kits available. Bu
|
By
Curt wb8yyy
· #83173
·
|
|
QCX+ Disable Keyer TX
#mods
#qcx
Bryan: so basically what you want is to be able to zero beat your 700 Hz sidetone against a transmitting station receive tone to ensure you are zero beat with that station? From looking at the schemat
Bryan: so basically what you want is to be able to zero beat your 700 Hz sidetone against a transmitting station receive tone to ensure you are zero beat with that station? From looking at the schemat
|
By
Larry VE7EA
· #83172
·
|
|
QCX+ Disable Keyer TX
#mods
#qcx
Thanks Larry, but you missed my point which was, "I know I can plow through e menus and put the rig in practice mode, but this is tedious when time is of the essence to catch that DX QC." The question
Thanks Larry, but you missed my point which was, "I know I can plow through e menus and put the rig in practice mode, but this is tedious when time is of the essence to catch that DX QC." The question
|
By
Bryan Curl
· #83159
·
|
|
QCX+ Disable Keyer TX
#mods
#qcx
Yes Menu 4.7 enable practice mode. Larry NA0F
Yes Menu 4.7 enable practice mode. Larry NA0F
|
By
Larry Christensen
· #83151
·
|