Date   

Re: Stabilizing toroids on filters #u3s #toroid

ke9uw
 

Hot glue is used by some hams for that purpose of securing the toroid. I leave them loose and that seems to be ok, but I don't know about transporting accidently dropping the rig. Hot glue does have a higher dielectric constant than air, something like 2 or 3, so that may become a factor.


Re: QLG2 case STLs

Dean Smith
 

USB panel mount wiring diagram here:-
if the colouring on the leads differ check first!


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

John Rabson
 

Loose braid is not always bad. In the early 1970s, to distribute University Radio Essex, we cabled the University of Essex Valley Buildings with RadioSpares' cheap and grottiest coax because it leaked and acted as a leak feeder system.

John G3PAI

On 2 Jun 2021, at 14:14, jerry@tr2.com wrote:


On 2021-06-02 01:40, David Wilcox via groups.io wrote:
Be careful with cables, coax and other interconnecting cables. I
follow quite a few .io sites and many issues are caused by faulty
cables and coax. Learn how to make your own correctly and then learn
how to test them.
*** And good coax isn't cheap. And cheap coax generally isn't good.
Take
apart a piece of Davis Buryflex - see the thick shield braid and the foil under it.
Then take apart a piece of Radio Shack RG8 - see the thin braid with big holes.

Also, coax doesn't last forever. Especially at high frequencies.

- Jerry KF6VB



Just buying commercial cables and not testing them
can be a problem as even some commercially built cables can be faulty.
In fact many of the issues I read about are caused by either faulty
cables or noisy power supplies. Beware.
Dave K8WPE since 1960
David J. Wilcox’s iPad
On Jun 1, 2021, at 8:46 PM, William Jenrick <wjenrick1@gmail.com>
wrote:

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@gmail.com>
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@gmail.com>
wrote:
Apparently some 50 Ohm RG-58 U coax cable is better than others.
Which vendor is recommended for BNC connectors????.....
--
_William Jenrick _
WJENRICK1@GMAIL.COM
Links:
------
[1] https://groups.io/g/QRPLabs/message/66601
[2] https://groups.io/mt/83246765/243852
[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: Resistor specs? Which wattage and type?

Roelof Bakker
 

Hello Jerry,

I have build home made attenuators using 0.6 W leaded metal film resistors.
E.g. 10 and 12 dB attenuators are flat +\- 0.1 dB up to 150 MHz and from 150 - 300 MHz +\- 0.3 dB.
They are excellent.

This are resistors costing 2 Eurocent per hundred.

73,
Roelof, pa0rdt


Re: Resistor specs? Which wattage and type?

jerry@tr2.com
 

All,
Is inductance of metal film resistors an issue at all at HF? I understand
that they are trimmed by cutting slots in the film.

- Jerry KF6VB

On 2021-06-02 02:45, Roelof Bakker wrote:
Hello,
Passive components have been improved considerable and the cost has gone down.
I suggest that you use 0.5 W metal film resistors with 1% tolerance as
the difference in cost is
negigible.
73,
Roelof, pa0rdt


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

jerry@tr2.com
 

On 2021-06-02 01:40, David Wilcox via groups.io wrote:
Be careful with cables, coax and other interconnecting cables. I
follow quite a few .io sites and many issues are caused by faulty
cables and coax. Learn how to make your own correctly and then learn
how to test them.
*** And good coax isn't cheap. And cheap coax generally isn't good.
Take
apart a piece of Davis Buryflex - see the thick shield braid and the foil under it.
Then take apart a piece of Radio Shack RG8 - see the thin braid with big holes.

Also, coax doesn't last forever. Especially at high frequencies.

- Jerry KF6VB



Just buying commercial cables and not testing them
can be a problem as even some commercially built cables can be faulty.
In fact many of the issues I read about are caused by either faulty
cables or noisy power supplies. Beware.
Dave K8WPE since 1960
David J. Wilcox’s iPad

On Jun 1, 2021, at 8:46 PM, William Jenrick <wjenrick1@gmail.com>
wrote:

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@gmail.com>
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@gmail.com>
wrote:
Apparently some 50 Ohm RG-58 U coax cable is better than others.
Which vendor is recommended for BNC connectors????.....
--
_William Jenrick _
WJENRICK1@GMAIL.COM
Links:
------
[1] https://groups.io/g/QRPLabs/message/66601
[2] https://groups.io/mt/83246765/243852
[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

K9NUD-Steve
 

Phil, welcome aboard! I just completed my first QCX Mini last week and I'm having lots of fun with it. My three recommendations:

  1. Get a "Panavise" circuit board holder (or similar). You can never have enough hands.
  2. Get a tiny soldering iron, skinny solder, and de-soldering braid (if you don't already have them)
  3. Get a magnifying hood, goggles, or desk-mounted magnifier, along with a jeweler's loupe. 
Mine fired up on the first try and tuned up easily. I get 4 watts @ 12v (5 @ 13.8) and make lots of great contacts. If I can hear them, they can usually hear me.

73, Steve


Re: QLG2 case STLs

Dean Smith
 

Had bit of an issue with USB. V3 bottom cover is fine for this box set. (all in files area! :))
If you have your own placement for the front panel, remember, the QCX+ case this mimics is offset and the parts reflect that!
Have fun and enjoy...
Dean G7EOB


Re: Resistor specs? Which wattage and type?

Roelof Bakker
 

Hello,

Passive components have been improved considerable and the cost has gone down.
I suggest that you use 0.5 W metal film resistors with 1% tolerance as the difference in cost is
negigible.

73,
Roelof, pa0rdt


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

David Wilcox K8WPE
 

Be careful with cables, coax and other interconnecting cables. I follow quite a few .io sites and many issues are caused by faulty cables and coax.  Learn how to make your own correctly and then learn how to test them.  Just buying commercial cables and not testing them can be a problem as even some commercially built cables can be faulty.  In fact many of the issues I read about are caused by either faulty cables or noisy power supplies.  Beware.

Dave K8WPE since 1960

David J. Wilcox’s iPad

On Jun 1, 2021, at 8:46 PM, William Jenrick <wjenrick1@...> wrote:


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: Resistor specs? Which wattage and type?

Timothy Fidler
 

VK5   Metal film are generally more accurate.   I am guessing that metal oxide may well use the brass cap on end - see below ...so that's a monkey in the works. 

You can separate out carbon ones because they have a small lump at each end. This is  small brass cap crimped over the carbon'/clay rod as clearly it is impossible to solder a  lead out wire to graphite'clay mix.
Carbon resistors are really going out of fashion except for ultra cheap applications but if you want leaded resistors then you may have to accept them.

Futurlec.com does bags of 1/2 watt resistors at a pretty good price.   It really is an Australian firm - run out o'  Nthern NsW.

any capacitor that is like a small dish plate with leads coming out at 4 and 8 o'clock is going to  be a ceramic capacitor.  often they are a clay brown but some are a dull green colour.  IN general you will want to specify NPO  dielectric.  There are other  Diels that are not nearly as temperature stable.  the difference could cause you big problems .


TEF , NzL


Re: Resistor specs? Which wattage and type?

 

Going by images and search, I think most resistors on the QCX are 0.5W or 0.25W, so there is no harm in using 0.5W instead of e.g. 0.25W presumably. But when ordering I still cannot tell the difference between metal oxide, metal or carbon film? E.g. those resistors in the CW filter circuit R28 thru R33 and R35.

On 2 Jun 2021, at 07:20, VK5EEE <vk5eee@vkcw.net> wrote:

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




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


Re: Resistor specs? Which wattage and type?

 

And for anyone who knows what are those greenish Capacitors C25 and C26 either side of L2 -- are they ceramic disk or monolithic ceramic?

On 2 Jun 2021, at 07:20, VK5EEE <vk5eee@vkcw.net> wrote:

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




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


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.

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