Re: Hamstick Mag Mount

Andy_501

开云体育

I haven't read all msgs in this thread closely but if you live in an apartment with a balcony with a metal railing you might consider a mag? mount centered on the railing and connect the railing electrically to the coax feedline braid.

I had a modified CB magmount that was resonant in 15 M band that was mounted to metal railing that way and was able to get many reliable qso's between Canada prairies and Central and South America. Anything to the North for me was a bit attenuated by all the steel and concrete but to the South it was wide open unhindered radiation area.

On 2020-04-03 6:20 a.m., Bob Fischer, Fischer Technical Services wrote:

Show quoted text

For your "sheet of metal" to be large enough to be effective, it would most likely be objectionable, too.

I second the recommendation someone else gave you.

Try using 1, 2, or 3 ground radial wires with the hamstick.??? As many as possible, in different directions, as horizontal as possible.? ?

Use as small diameter wire as you can get and run them wherever you can hide them.

Good luck.

Bob

WB8BEL

From: "Christopher Miller" <djmalak2k6@...>
To: [email protected]
Sent: Friday, April 3, 2020 6:44:55 AM
Subject: Re: [BITX20] Hamstick Mag Mount

I know I have said this before but I will again now without malice.

The manager of the property is behind me working to build out a working Hf/vhf/uhf station. They let me put a hole in the wall to pass coax through.

The owner doesn’t want exposed antennas as the normal idiot landlord would.

I got flack for putting my dipole up with cable tv coax.

I would want to get ham sticks and mount them on a base. I’m guessing a large sheet of metal will work instead of the car.

Chris

On Fri, Apr 3, 2020 at 3:15 AM Vic WA4THR via <vhklein=[email protected]> wrote:

For portable use I have used a clamp-on mount (also sold to make a hamstick dipole) attached to a metal stake. Sticking that into the ground made a usable antenna. In cases where I didn't think I had a good gound I attached some radials made with split zip cord and just laid them on top of the ground, or if in an upper story of a motel I would clamp to a balcony railing and droop the radials over the edge or spead around on the floor. I made contacts with this setup, but it was a bit cumbersome to carry along, so lately I have been using a relatively inexpensive QRP loop and it actually works a little better, plus it disassembles into a small easily carried package.

I still use the hamsticks with a mag mount when going mobile in my wife's SUV

=Vic=

Re: Hamstick Mag Mount

#77666

For your "sheet of metal" to be large enough to be effective, it would most likely be objectionable, too.

I second the recommendation someone else gave you.

Try using 1, 2, or 3 ground radial wires with the hamstick.??? As many as possible, in different directions, as horizontal as possible.? ?

Use as small diameter wire as you can get and run them wherever you can hide them.

Good luck.

Bob

WB8BEL

Show quoted text

From: "Christopher Miller" <djmalak2k6@...>
To: [email protected]
Sent: Friday, April 3, 2020 6:44:55 AM
Subject: Re: [BITX20] Hamstick Mag Mount

I know I have said this before but I will again now without malice.

The manager of the property is behind me working to build out a working Hf/vhf/uhf station. They let me put a hole in the wall to pass coax through.

The owner doesn’t want exposed antennas as the normal idiot landlord would.

I got flack for putting my dipole up with cable tv coax.

I would want to get ham sticks and mount them on a base. I’m guessing a large sheet of metal will work instead of the car.

Chris

On Fri, Apr 3, 2020 at 3:15 AM Vic WA4THR via <vhklein=[email protected]> wrote:

For portable use I have used a clamp-on mount (also sold to make a hamstick dipole) attached to a metal stake. Sticking that into the ground made a usable antenna. In cases where I didn't think I had a good gound I attached some radials made with split zip cord and just laid them on top of the ground, or if in an upper story of a motel I would clamp to a balcony railing and droop the radials over the edge or spead around on the floor. I made contacts with this setup, but it was a bit cumbersome to carry along, so lately I have been using a relatively inexpensive QRP loop and it actually works a little better, plus it disassembles into a small easily carried package.

I still use the hamsticks with a mag mount when going mobile in my wife's SUV

=Vic=

Re: Hamstick Mag Mount

#77665

I know I have said this before but I will again now without malice.

The manager of the property is behind me working to build out a working Hf/vhf/uhf station. They let me put a hole in the wall to pass coax through.

The owner doesn’t want exposed antennas as the normal idiot landlord would.

I got flack for putting my dipole up with cable tv coax.

I would want to get ham sticks and mount them on a base. I’m guessing a large sheet of metal will work instead of the car.

Chris

Show quoted text

On Fri, Apr 3, 2020 at 3:15 AM Vic WA4THR via <vhklein=[email protected]> wrote:

For portable use I have used a clamp-on mount (also sold to make a hamstick dipole) attached to a metal stake. Sticking that into the ground made a usable antenna. In cases where I didn't think I had a good gound I attached some radials made with split zip cord and just laid them on top of the ground, or if in an upper story of a motel I would clamp to a balcony railing and droop the radials over the edge or spead around on the floor. I made contacts with this setup, but it was a bit cumbersome to carry along, so lately I have been using a relatively inexpensive QRP loop and it actually works a little better, plus it disassembles into a small easily carried package.

I still use the hamsticks with a mag mount when going mobile in my wife's SUV

=Vic=

Re: uBitx v.4 build information

#77664

My V4 shows a 470pf at C81, and my comment was a reflection of a bad pencil note on my "to do" list. Previous posts had suggested 0.01uf across C81 as improving the low power on 40m, so that's what I should have said. However, I won't be doing anything until I scope it out a bit more. The CW output is pretty low, 3w, while SSB is around 7w. Other bands below 17m are double that. But, as I said, I'll do some more testing to be sure of the scope of the issue which I see others are dealing with, as well. Thanks for the comments.

=Vic=

Re: Hamstick Mag Mount

#77663

For portable use I have used a clamp-on mount (also sold to make a hamstick dipole) attached to a metal stake. Sticking that into the ground made a usable antenna. In cases where I didn't think I had a good gound I attached some radials made with split zip cord and just laid them on top of the ground, or if in an upper story of a motel I would clamp to a balcony railing and droop the radials over the edge or spead around on the floor. I made contacts with this setup, but it was a bit cumbersome to carry along, so lately I have been using a relatively inexpensive QRP loop and it actually works a little better, plus it disassembles into a small easily carried package.

I still use the hamsticks with a mag mount when going mobile in my wife's SUV

=Vic=

Hamstick Mag Mount

#77662

Hello,

I’m curious what I would need to do to use a mobile mag mount for an HF whip without mounting it to a car. I’m guessing I need to get a large sheet of metal to act as a ground plain. (Because of the lack of a car.)

Chris

Re: Nominal power supply voltage

#77661

Thanks,

I was lucky enough to be given a complete transceiver I don’t want to mess with cutting traces and modifying it until I have everything set up. I just wanted to make sure I didn’t need to increase the voltage.

Chris

Show quoted text

On Fri, Apr 3, 2020 at 12:38 AM Ian Reeve <ian.radioworkshop@...> wrote:

I use 12 volts but a higher voltage can be delivered to just the PA feed to boost the rf output.

Get

From: [email protected] <[email protected]> on behalf of Christopher Miller <djmalak2k6@...>
Sent: Friday, April 3, 2020 8:26:22 AM
To: [email protected] <[email protected]>
Subject: [BITX20] Nominal power supply voltage
?

Hello,

I am currently feeding 12 volts in to my v3 uBitx. I was wondering if I should be using 13.8 volts. Will that blow up the 5 volt regulator?

Thanks,

Chris KF4FTR

Re: Nominal power supply voltage

Ian Reeve

#77660

开云体育

In the v3 the audio output chip is at its limit with 12 volts,the PA can be run from say 15. or a bit more for increased rf output

Get

Show quoted text

From: [email protected] <[email protected]> on behalf of MVS Sarma <mvssarma@...>
Sent: Friday, April 3, 2020 8:37:51 AM
To: [email protected] <[email protected]>
Subject: Re: [BITX20] Nominal power supply voltage

?

Sorry. I sm withdrawing my statement.? V3, the TDA2822 WILL LIKELY GET DAMAGED AT HIGHER VOLTAGE.?

LIMIT TO 12.?

After all you can reduce 13.8 to 12 by some pot on the psu.?

On Fri, 3 Apr 2020, 1:05 pm Mvs Sarma, <mvssarma@...> wrote:

You can use? q3.8. Pl dont again say + /-
All the best.?

On Fri, 3 Apr 2020, 12:56 pm Christopher Miller, <djmalak2k6@...> wrote:

Hello,

I am currently feeding 12 volts in to my v3 uBitx. I was wondering if I should be using 13.8 volts. Will that blow up the 5 volt regulator?

Thanks,

Chris KF4FTR

Re: Nominal power supply voltage

#77659

Sorry. I sm withdrawing my statement.? V3, the TDA2822 WILL LIKELY GET DAMAGED AT HIGHER VOLTAGE.?

LIMIT TO 12.?

After all you can reduce 13.8 to 12 by some pot on the psu.?

Show quoted text

On Fri, 3 Apr 2020, 1:05 pm Mvs Sarma, <mvssarma@...> wrote:

You can use? q3.8. Pl dont again say + /-
All the best.?

On Fri, 3 Apr 2020, 12:56 pm Christopher Miller, <djmalak2k6@...> wrote:
Hello,

I am currently feeding 12 volts in to my v3 uBitx. I was wondering if I should be using 13.8 volts. Will that blow up the 5 volt regulator?

Thanks,
Chris KF4FTR

Re: Nominal power supply voltage

Ian Reeve

#77658

开云体育

I use 12 volts but a higher voltage can be delivered to just the PA feed to boost the rf output.

Get

Show quoted text

From: [email protected] <[email protected]> on behalf of Christopher Miller <djmalak2k6@...>
Sent: Friday, April 3, 2020 8:26:22 AM
To: [email protected] <[email protected]>
Subject: [BITX20] Nominal power supply voltage

?

Hello,

I am currently feeding 12 volts in to my v3 uBitx. I was wondering if I should be using 13.8 volts. Will that blow up the 5 volt regulator?

Thanks,

Chris KF4FTR

Re: Nominal power supply voltage

#77657

You can use? q3.8. Pl dont again say + /-

All the best.?

Show quoted text

On Fri, 3 Apr 2020, 12:56 pm Christopher Miller, <djmalak2k6@...> wrote:

Hello,

I am currently feeding 12 volts in to my v3 uBitx. I was wondering if I should be using 13.8 volts. Will that blow up the 5 volt regulator?

Thanks,
Chris KF4FTR

Nominal power supply voltage

#77656

Hello,

I am currently feeding 12 volts in to my v3 uBitx. I was wondering if I should be using 13.8 volts. Will that blow up the 5 volt regulator?

Thanks,

Chris KF4FTR

Re: #v6 need a 12v connectiion #v6

howard winwood G4GPF

#77655

One amp is not enough, you need a 3 amp supply to give a little head room.

Show quoted text

On Fri, 3 Apr 2020, 04:38 _Dave_ AD0B, <davesters@...> wrote:

Once you get your antenna figured out, you will want a bigger power supply. The sag would be significant. As would be the electric noise.
--
73
Dave

Re: #v6 need a 12v connectiion #v6

#77654

Once you get your antenna figured out, you will want a bigger power supply. The sag would be significant. As would be the electric noise.
--
73
Dave

Re: uBitx v.4 build information

Mark - N7EKU

#77653

Curt,

I wasn't arguing against your advice.? I merely stated what Allison said worked well for her.? She made other modifications too, but the order is not always clear in the older posts.? In any case, since users' rigs all seem to be a bit different, a few hundred more pF to C81 maybe be perfect, or it may require more or less e.g. experimentation may be necessary.

73,

Mark

Re: uBitx v.4 build information

#77652

Mark

perhaps she made other adjustments, as mine improved greatly with just a few hundred pF added at C81.? please see Asshar's post about C81, I think my adjustment is consistent with what he was recommending for the FEW v4's that have a dip at 40m.?

Curt

Re: uBitx v.4 build information

Mark - N7EKU

#77651

Hi Vic,

Adding 0.1uF will result in basically no frequency compensation for Q90.? Looking at past posts, Allison ended up with a total of 1100pF for C81.

73,

Mark

Re: #v6 need a 12v connectiion #v6

#77650

I just finished constructing my full kit uBitx v6 and powered it up with a 12v- 1amp wall wart. When?I connected?to my Mag Loop antenna, I did not receive voice nor CW. However, all the icons on the display appeared to work correctly. My problem was when I pressed the PTT on the mic, I did not get a TXT?icon lit up. I am left with one of 3 possibilities -?

1 the antenna does not work (not very likely)

2 the problem lies with the mic (possible?)?

3 the txmitter has a problem (possible but I have no way to verify)

How can I verify which one is the problem, and then get it fixed??

Thanks,

Larry (N8MGU)

Show quoted text

On Thu, Apr 2, 2020 at 12:05 PM _Dave_ AD0B <davesters@...> wrote:

Hi Ralph a meter could tell you what you want to know about your power source.

Definitely test the fan running off your radio power supply for electric noise. The worst offender I had was a small squirrel cage fan. On most of the units I had designed a duct to direct the air into the heat sink area . Here was the offensive fan.
?

I thought the duct was cool and fit in the space. Spent a lot of effort ciphering the fan mount without trying the fan first.?

Perhaps like a lot of 3d designers I put my prototypes on thingiverse.? The best solution I have found for uBITX heat is attaching the power transistors to large heat sinks or with isolation, to the aluminum case. No noise or extra power consumption and heat is dissipated.
--
73
Dave

--

GnuPG Public Key ID: DC840312
==============================================================

==============================================================
Never cross a Dragon, for you are crunchy and taste delicious!
My Interests are:
Ham Radio (N8MGU) | Opera | Theater | Sailing | Judaica | CKCS

Re: uBitx v.4 build information

#77649

Boa noite, grupo.

Tenho um uBITX V4, e queimaram as suas saída IRF510, n?o tenhos IRF510 de reserva, mas tenho no estoque dois RD16HHF1, posso trocar por IRF510, quais as providências neste caso?

-----

Good night, group.

I have an uBITX V4, and they burned their IRF510 output, I don't have an IRF510 in reserve, but I have two RD16HHF1 in stock, can I exchange for IRF510, what are the measures in this case?

--

Sauda??es fraternais, 73/51 PY2PVB

Rubens Kamimura

Tel. (18) 3746-8680 ramal 116

Cel. (18) 9-9819-2225 WhatsApp ou (18) 9-9819-2255?

Em ter., 31 de mar. de 2020 às 11:49, flatpickn via Groups.Io <flatpickn=[email protected]> escreveu:

Show quoted text

Like some other folks, I have an unbuilt v.4. I've waited to build it until the dust settled over the fix for the harmonics and spurs. I've begun putting it together and realized how hard it is to find good information specific to the v.4. Not because it isn't there but because at the time the fixes and mods were written up they weren't identified as v.4. I'm not saying anyone was lacking in any way, it was the current version and people wrote issues, mods, and fixes. They didn't know that we'd later have a v.6 that was quite different from the v.4.?

Based on a comment by Curt in an earlier post (ubitx 4 - want a fresh start, need guidance) he posted a link with some great uBitx v.4 build information.? ? ? ? ? ? ?

I just wanted to put it here with an easily searchable title for other v.4 builders

?

Sasquatch Stomp is Tomorrow, Friday 3 April

#77648

开云体育

Hello All,

?

Just a reminder, the annual Sasquatch Stomp is tomorrow, Friday 3 April.

?

Check out the details here:

?

This is a fun event that should not be missed, especially since most of us are doing our best to follow CDC guidelines in these times.

?

73, and we hope to work you in the Stomp.

?

Wayne? NB6M?