Date   

Resistor specs? Which wattage and type?

 

Stupid question of the day. I'm ordering resistors for QCX, e.g. the CW filter circuit and the mod for original QCX to allow the LED display to start without multiple reboots.

WHAT type and wattage are required?

Are the general QCX resistors metal oxide film, or metal film, or carbon film, or doesn't it matter?

And what wattage are they: 1/8W, 1/4W, 1/2W, 1W, 2W, 3W or 5W?

Thank you in advance!

--
Love 30m and CW?
http://www.30cw.net


Re: I just jumped off my safe zone

 

In the same boat (anchor) as you and no I won't leave you at least in solidarity in asking stupid questions of the more technical folks? :-D

Take the plunge indeed Phil, if I could put them together then anyone with patience and care can. 

And it really is a great experience, educational, and a pleasure to use afterwards, let alone the possibiities of mods. 

For me my main need would be a wide filter setting, since listening to narrow band local QRM noise floor is taxing on the brain, and the nice crashes of natural QRN are cut out, also you cannot tune in to WWVH "Aloha" when you're bored. But this too is a doable mod! That's one of my next projects to do, initial attempts failed, but I got great support in here with the values of resistances to try, and in fact, the "re-education" (since it is so long ago I'd forgotten) that just putting the same value resistors in parallel will reduce as required.  

So which band are you planning to build your QCX for? 

On 2 Jun 2021, at 02:13, wa8yan.radio via groups.io <wa8yan.radio@...> wrote:


Ok guys and gals....... 

I finally convinced my finance director that I NEEDED a QCX+ for Father's Day.  

Full disclosure: I am stuck in the era of 6146's and big ole Dentron tuners, etc.  

Fuller disclosure: if I hadn't spent the last several months reading posts on this group and seeing how many truly skilled folks are willing to help when a builder gets in trouble, I would never have had the guts to try this.  I've built several Heathkit and Eico kits in the past so hopefully enough of that experience coupled with your support will help me complete a fine QRP rig from QRP Labs. 

Looking forward to it. Don't leave me though.
Phil WA8YAN. 


Sent from my Verizon, Samsung Galaxy smartphone



--
Love 30m and CW?
http://www.30cw.net


Re: Values for #15m ? #15m

Rod Smith
 

For some reason, after a short while, I started again from the bottom of the list!
Often the threads wander well away from the subject headings, so maybe that was a little bit wise as well as dead lucky!
I'd be interested to hear how it goes for you with those values
Cheers
Rod
G0VKX


Re: Just completed a QCX Mini 20M build #20m

 

Go for 30m! www.30cw.net see the 30m INFO menu there, and look around, there is much going for that band, and for QRP it's got its advantages. I'll summarize plus and minus for 40m and 30m in case you haven't thought of all of the same :-) below. Also, a 40m won't work at all on 30m, but my 30m QCX works well on 40m with 3W out on 40m. Build for 30m and you may well benefit from 40m as a bonus.

30m vs 40m

ADVANTAGES OF 30M

* A great club dedicated to 30m with newsletter www.30cw.net 
* Better results with antennas at any given height due to shorter wavelength
* 24/7/365 open also with longer "skip" distance
* 80m dipole will work even better on 30m (with a little lengthening or a tuner)
* Mexican fishermen on SSB on occasion so you know band is open to near Mexico
* RTTY station www.30cw.net/ddk9 well placed in Europe so you know propagation to busy 30m CW in Europe
* No contests

DISADVANTAGES OF 30M

* Less activity than 40m (especially if you're in an area with higher population density where day time QSO will be possible on 40m)
* Occasional Mexican fishermen QRM, though this is made up for by a 100 times higher volume of Indonesiian fishermen AND villagers on 40m
* If you're in a high-density pop area more near-in stations will fall into dead skip zone of first hop unless you use a low down dipole NVIS ant.
* Less hams active on 30m than on 40m
* No contests (if you like that sort of thing)

Perhaps some 40m fans could try to tip the balance a little away from the favourable 30m? 

On 1 Jun 2021, at 23:59, K9NUD-Steve <k9nud@...> wrote:

Thanks, Julian. I know what you mean. I'm only referring to keying mistakes. If I goof, I send some dits at a different cadence than my keyer speed before resending the intended character. I suppose I could remember to send some slow dits instead. The Autospace is turned off. 

It's not a big deal, and Iambic B solved it for me. My other rigs (Icom & Elecraft) let me tap out a few fast dits, whereas this radio does not when in Iambic A mode. But this is a $55 radio that I assembled myself. I am definitely not complaining! I am thoroughly enjoying the radio, and can't decide whether the next one will be a 30M, 40M. Maybe I need to get both :-)


--
Love 30m and CW?
http://www.30cw.net


Re: I just jumped off my safe zone

jerry@tr2.com
 

I mostly avoid any and all paperwork. People send me mail, I scan it and
shred it. I am working on emptying my file cabinets - to ultimately toss them -
and keeping everything on my Linux server.

...But this, I printed. Color, double sided. IIRC 38 sheets of paper.
I punched it and put it in a three-ring binder. Ticked off each part as I
measured and installed it. Scribbled notes on it.

- Jerry KF6VB

On 2021-06-01 19:25, wb8yyy via groups.io wrote:
Phil
Go ahead to download the qcx plus manual. Forget printing it, has
anyone here smelled a paper factory, just display it on a monitor to
match where to place the parts.
You need a low wattage soldering iron. I honestly suggest building a
modern simpler kit as a warmup. Since you are stateside let me
recommend qrpguys, qrpkits, kc9on and 4stateqrp. Its good to practice
on something less dense. The qcx has one challenging toroidal T1. I
like my 80m qcx plus, its T1 is more challenging than 40 or 20m. But
choose a band you will enjoy.
73 curt wb8yyy
Links:
------
[1] https://groups.io/g/QRPLabs/message/66587
[2] https://groups.io/mt/83249931/243852
[3] https://groups.io/g/QRPLabs/post
[4] https://groups.io/g/QRPLabs/editsub/243852
[5] https://groups.io/g/QRPLabs/leave/10312280/243852/1190336630/xyzzy


Stabilizing toroids on filters #u3s #toroid

Tom WE8TOM
 

I am building up a U3S with the relay switched filter board.  This means I had to wind 19 toroids (including the transformer on the main board).
I noticed that they are somewhat loose on the boards and I am a little concerned about them getting damaged with vibrations from moving the unit around.

Would it cause any issues to secure them with a drop of something like hot glue?   It's something I have plenty of and have used it in other non-RF electrical projects.  Any better recommendations? 


Re: I just jumped off my safe zone

 

I had to laugh at what you said about paper factories, Curt.
I worked for a Sheboygan, WI company in the paper industry (motion control systems for palletizers, etc., in the finishing rooms) during '88 and '89. I spent plenty of time in the paper mills around Appleton, Nekoosa, etc., and yes, they do stink!
Pays the bills, though, is what folks up there will say if you ask them.
--
Julian, N4JO.


Re: I just jumped off my safe zone

wa8yan.radio
 

Yes, I also got the dummy load and the tcxo comming.



Sent from my Verizon, Samsung Galaxy smartphone


-------- Original message --------
From: Julian N4JO <n4jo@...>
Date: 6/1/21 10:44 PM (GMT-05:00)
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] I just jumped off my safe zone

Buy the dummy load with the QCX and build that first, just to help you remember which end to hold the soldering iron..

I worked for Heathkit in Gloucester, England, back in the mid 70's: I'll bet dollars to donuts you won't do anything as bad as some of the kits I had to get working... and that includes instruments like the oscilloscopes that one might presume were built by people with some kind of fore-knowledge...

--
Julian, N4JO.


Re: I just jumped off my safe zone

 

Buy the dummy load with the QCX and build that first, just to help you remember which end to hold the soldering iron..

I worked for Heathkit in Gloucester, England, back in the mid 70's: I'll bet dollars to donuts you won't do anything as bad as some of the kits I had to get working... and that includes instruments like the oscilloscopes that one might presume were built by people with some kind of fore-knowledge...

--
Julian, N4JO.


Re: I just jumped off my safe zone

wa8yan.radio
 

I love the consistency of 40 meters so my first QCX+ is gonna  be a 40.



Sent from my Verizon, Samsung Galaxy smartphone


-------- Original message --------
From: "wb8yyy via groups.io" <wb8yyy@...>
Date: 6/1/21 10:25 PM (GMT-05:00)
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] I just jumped off my safe zone

Phil

Go ahead to download the qcx plus manual. Forget printing it, has anyone here smelled a paper factory, just display it on a monitor to match where to place the parts. 

You need a low wattage soldering iron. I honestly suggest building a modern simpler kit as a warmup. Since you are stateside let me recommend qrpguys, qrpkits, kc9on and 4stateqrp. Its good to practice on something less dense. The qcx has one challenging toroidal T1. I like my 80m qcx plus, its T1 is more challenging than 40 or 20m. But choose a band you will enjoy. 

73 curt wb8yyy


Re: I just jumped off my safe zone

Curt wb8yyy
 

Phil

Go ahead to download the qcx plus manual. Forget printing it, has anyone here smelled a paper factory, just display it on a monitor to match where to place the parts. 

You need a low wattage soldering iron. I honestly suggest building a modern simpler kit as a warmup. Since you are stateside let me recommend qrpguys, qrpkits, kc9on and 4stateqrp. Its good to practice on something less dense. The qcx has one challenging toroidal T1. I like my 80m qcx plus, its T1 is more challenging than 40 or 20m. But choose a band you will enjoy. 

73 curt wb8yyy


Re: I just jumped off my safe zone

jerry@tr2.com
 

For me, the hardest part of this kit was waiting for it to arrive.

- Jerry KF6VB

On 2021-06-01 19:17, jjpurdum via groups.io wrote:
Phil:
You just walked into a herd of Elmers. I think everyone here wants to
see everyone else succeed. Also, when you see Hans' assembly manual,
you'll throw rocks at the Heathkit manuals!
Jack, W8TEE
On Tuesday, June 1, 2021, 10:13:56 PM EDT, wa8yan.radio via groups.io
<wa8yan.radio=yahoo.com@groups.io> wrote:
Ok guys and gals.......
I finally convinced my finance director that I NEEDED a QCX+ for
Father's Day.
Full disclosure: I am stuck in the era of 6146's and big ole Dentron
tuners, etc.
Fuller disclosure: if I hadn't spent the last several months reading
posts on this group and seeing how many truly skilled folks are
willing to help when a builder gets in trouble, I would never have had
the guts to try this. I've built several Heathkit and Eico kits in
the past so hopefully enough of that experience coupled with your
support will help me complete a fine QRP rig from QRP Labs.
Looking forward to it. Don't leave me though.
Phil WA8YAN.
Sent from my Verizon, Samsung Galaxy smartphone
Links:
------
[1] https://groups.io/g/QRPLabs/message/66585
[2] https://groups.io/mt/83249931/243852
[3] https://groups.io/g/QRPLabs/post
[4] https://groups.io/g/QRPLabs/editsub/243852
[5] https://groups.io/g/QRPLabs/leave/10312280/243852/1190336630/xyzzy


Re: I just jumped off my safe zone

jjpurdum
 

Phil:

You just walked into a herd of Elmers. I think everyone here wants to see everyone else succeed. Also, when you see Hans' assembly manual, you'll throw rocks at the Heathkit manuals!

Jack, W8TEE

On Tuesday, June 1, 2021, 10:13:56 PM EDT, wa8yan.radio via groups.io <wa8yan.radio@...> wrote:



Ok guys and gals....... 

I finally convinced my finance director that I NEEDED a QCX+ for Father's Day.  

Full disclosure: I am stuck in the era of 6146's and big ole Dentron tuners, etc.  

Fuller disclosure: if I hadn't spent the last several months reading posts on this group and seeing how many truly skilled folks are willing to help when a builder gets in trouble, I would never have had the guts to try this.  I've built several Heathkit and Eico kits in the past so hopefully enough of that experience coupled with your support will help me complete a fine QRP rig from QRP Labs. 

Looking forward to it. Don't leave me though.
Phil WA8YAN. 


Sent from my Verizon, Samsung Galaxy smartphone


I just jumped off my safe zone

wa8yan.radio
 


Ok guys and gals....... 

I finally convinced my finance director that I NEEDED a QCX+ for Father's Day.  

Full disclosure: I am stuck in the era of 6146's and big ole Dentron tuners, etc.  

Fuller disclosure: if I hadn't spent the last several months reading posts on this group and seeing how many truly skilled folks are willing to help when a builder gets in trouble, I would never have had the guts to try this.  I've built several Heathkit and Eico kits in the past so hopefully enough of that experience coupled with your support will help me complete a fine QRP rig from QRP Labs. 

Looking forward to it. Don't leave me though.
Phil WA8YAN. 


Sent from my Verizon, Samsung Galaxy smartphone


Re: Just completed a QCX Mini 20M build #20m

 

I gotcher, Steve! I just thought I'd mention the spacer-outer widget because I got bitten by it when I first started learning to use the QCX. I'm certainly nowhere near accomplished enough to send a string of dits faster than I can send normally: I would just end up making even more mistakes, HI HI (which I just noticed is twelve dits, by the way ...)
--
Julian, N4JO.


Re: Coax cable for end feed antenna...New to the game!!!!!

William Jenrick
 

Tnx for the info.....I will check them out.
 I bought a ZM-2 ATU tuner kit thinking that was the problem with my hidden under the eves long wire not producing. It worked great for a day, and then I could not tune zilch!!!....Checked all of the connections and found that twisting the coax one way or another it would tune but not reliable with lots of static and low rf output. When it worked I got > 50 volts out (6.25 watts) to the antenna. Now, <30 volts....!!!!!
Lots to learn after > 55 years "out of the game".....
73 

On Tue, Jun 1, 2021 at 5:04 PM Mel Snyder <melsnyder@...> wrote:
Check out https://cablesondemand.com/bnc-male-to-bnc-male-rg58-50-ohm-coaxial-cable-assembly-co-058bncx200?utm_source=google&utm_medium=cpc&adpos&scid=scplpCO-058BNCX200-010&sc_intid=CO-058BNCX200-010&gclid=CjwKCAjwtdeFBhBAEiwAKOIy5zRouIRbq6bKx_pkOH2c8hQwR7iXzIPk_v1MpvyvCxHa79s46Suo9BoCee0QAvD_BwE

Amphenol is an excellent manufacturer and this is their consumer service site. Stay away from Amazon cables. I just had the second fail in 2 years - first an RG-8X and today I discovered that a 50’ RG-174C cable was causing bizarre nonuniformity across the 40 meter band!




On Jun 1, 2021, at 7:19 PM, William Jenrick <wjenrick1@...> wrote:

Apparently some 50 Ohm RG-58 U coax cable is better than others. Which vendor is recommended for BNC connectors????.....



--
William Jenrick 


Re: QLG2 case STLs

Dean Smith
 

now a V2 as i made the usb socket hole on the bottom slightly too small... now larger.


Re: Coax cable for end feed antenna...New to the game!!!!!

Mel Snyder
 

Check out https://cablesondemand.com/bnc-male-to-bnc-male-rg58-50-ohm-coaxial-cable-assembly-co-058bncx200?utm_source=google&utm_medium=cpc&adpos&scid=scplpCO-058BNCX200-010&sc_intid=CO-058BNCX200-010&gclid=CjwKCAjwtdeFBhBAEiwAKOIy5zRouIRbq6bKx_pkOH2c8hQwR7iXzIPk_v1MpvyvCxHa79s46Suo9BoCee0QAvD_BwE

Amphenol is an excellent manufacturer and this is their consumer service site. Stay away from Amazon cables. I just had the second fail in 2 years - first an RG-8X and today I discovered that a 50’ RG-174C cable was causing bizarre nonuniformity across the 40 meter band!




On Jun 1, 2021, at 7:19 PM, William Jenrick <wjenrick1@...> wrote:

Apparently some 50 Ohm RG-58 U coax cable is better than others. Which vendor is recommended for BNC connectors????.....


Re: Just completed a QCX Mini 20M build #20m

K9NUD-Steve
 

Thanks, Julian. I know what you mean. I'm only referring to keying mistakes. If I goof, I send some dits at a different cadence than my keyer speed before resending the intended character. I suppose I could remember to send some slow dits instead. The Autospace is turned off. 

It's not a big deal, and Iambic B solved it for me. My other rigs (Icom & Elecraft) let me tap out a few fast dits, whereas this radio does not when in Iambic A mode. But this is a $55 radio that I assembled myself. I am definitely not complaining! I am thoroughly enjoying the radio, and can't decide whether the next one will be a 30M, 40M. Maybe I need to get both :-)


Re: QLG2 Failure

Dennis Rieger
 

t appears to be a failure. There is no short on the SMA connector. It is installed horizontally and the resistance is in the order of 750K ohms. The second unit measures about the same. I would appreciate a replacement unit when you have adequate stock. I don't need a second antenna the one that came with unit works on the second QLG2 with no issues.

Thanks

Dennis
KK5DB

6201 - 6220 of 71917