Re: Prewired 16x2 blue display
|
Re: Using Vacuum Tube heathkit as Linear Amplifier for QRP
I have used a healthkit dx60 with the bitx20 de vu2pep
On Wednesday, November 13, 2019, 07:49:04 PM GMT+5:30, James Lynes <jmlynesjr@...> wrote:
Yes it did. I read it last night. I believe the same info is on the qrp labs website in the qsx area.
James
|
Prewired 16x2 blue display
Looking for sources for prewired 16*2 blue displayed I have ordered a few but they all came with the pins not soldered and I melted the unit trying to install the pins.? Companies who won't charge high shipping fees to Canada are preferred.
Thank you
|
you'll probably want the BCB filter /and/ a notch filter for that
specific AM transmitter.
-adrian
(about 8mi from a 50KW AM transmitter, and 10mi from another..)
toggle quoted message
Show quoted text
On Thu, 14 Nov 2019 at 16:40, Preston <preston.azcpapro@...> wrote:
According to Wikipedia KFNN broadcasts from 8145 E Evans Rd in Scottsdale which is 4.5 miles away. Wattage is 22,000.
|
According to Wikipedia KFNN broadcasts from?8145 E Evans Rd in Scottsdale which is 4.5 miles away.? Wattage is 22,000.
|
I tried tuning 1440 and don't hear much, but 1510 KFNN is really, really loud.? They show their address at?8145 E Evans Rd Scottsdale, 85260 which would be very close if the antenna is at that location.
|
Re: Nextion 3.5 with CEC 1.097
Thanks Nikos,
I've been trying to get my LCD to flash for a few days now, it would flash, however, not use the full screen.
Denis
KC6AUP
|
I have a similar one on my M0NKA mcHF and I really like the finger indent in it. Got it with the chinese mcHF case kit for my build.
|
Toroids are self-shielding.
Axials need to be mounted at right angles to minimize coupling between them.? If you have three, you can mount them in the x, y, and z planes.
At this point, most folks just give up and use toroids. 
73,
-- Dave, N8SBE
-------- Original Message --------
Subject: Re: [BITX20] Band pass filter
From: "Jack, W8TEE via " <jjpurdum@...>
Date: Thu, November 14, 2019 11:07 am
To: < [email protected]>
I'm a software guy, so probably shouldn't answer that. My gut says wound toroids are always better, but the axials worked fine for me. Some EE-type can give a better answer.
Jack, W8TEE
On Thursday, November 14, 2019, 10:39:43 AM EST, Doug W < dougwilner@...> wrote:
On Thu, Nov 14, 2019 at 08:15 AM, Jack, W8TEE wrote: I built a QRP version for my 49-er that works quite well. At QRP levels is there an advantage or disadvantage to using wound toriods versus radial inductors (or even SMD), especially on the receive side? ? --
--
Jack, W8TEE
|
You might do a little investigating to see if there really is a loud station blocking your receiver before you invest in something you may not need. ?The first thing I would try is just receiving off a long wire stuffed into the antenna port (NO TRANSMITTING!).? You¡¯ll get a better understanding if the receiver is the problem that way. ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Preston
Sent: Thursday, November 14, 2019 10:22 AM
To: [email protected]
Subject: Re: [BITX20] Band pass filter ? I am about 14 miles away.? I am in a densely?populated area with a large apartment group next to our condo community, so I suspect there is probably a huge number of different electronic devices and there could be spurious emissions from them.
Preston G. Preston Parker 5704 E Aire Libre Ave Unit 1025 Scottsdale, AZ 85254 preston.azcpapro@... 480 499-5427? 866 459-5242 480 499-5761 Fax
Help us improve by taking a short survey ? ? On Thu, Nov 14, 2019 at 7:44 AM Ken Held KF7DUR via Groups.Io <kf7dur=[email protected]> wrote: The only AM broadcast transmitter in Scottsdale is located @ 64th st. & Thomas rd.
KAZG 1440AM 5,000 W day, 52 W night
Are you close to that location?
-- ¡_. _._
|
I am about 14 miles away.? I am in a densely?populated area with a large apartment group next to our condo community, so I suspect there is probably a huge number of different electronic devices and there could be spurious emissions from them.
Preston
G. Preston Parker
5704 E Aire Libre Ave Unit 1025
Scottsdale, AZ 85254
preston.azcpapro@...
480 499-5427? 866
459-5242
480 499-5761 Fax
Help us improve by taking a short survey
On Thu, Nov 14, 2019 at 7:44 AM Ken Held KF7DUR via Groups.Io <kf7dur= [email protected]> wrote: The only AM broadcast transmitter in Scottsdale is located @ 64th st. & Thomas rd.
KAZG 1440AM 5,000 W day, 52 W night
Are you close to that location?
|
I'm a software guy, so probably shouldn't answer that. My gut says wound toroids are always better, but the axials worked fine for me. Some EE-type can give a better answer.
Jack, W8TEE
On Thursday, November 14, 2019, 10:39:43 AM EST, Doug W <dougwilner@...> wrote:
On Thu, Nov 14, 2019 at 08:15 AM, Jack, W8TEE wrote:
I built a QRP version for my 49-er that works quite well.
At QRP levels is there an advantage or disadvantage to using wound toriods versus radial inductors (or even SMD), especially on the receive side? ? --
-- Jack, W8TEE
|
For TX I would only use toroids or air wound coils. For RX you could use radial or SMD. The Q might be better with toroids, although.
Il 14/nov/2019 16:39, "Doug W" < dougwilner@...> ha scritto: On Thu, Nov 14, 2019 at 08:15 AM, Jack, W8TEE wrote:
I built a QRP version for my 49-er that works quite well.
At QRP levels is there an advantage or disadvantage to using wound toriods versus radial inductors (or even SMD), especially on the receive side?
?
--
|
On Thu, Nov 14, 2019 at 08:15 AM, Jack, W8TEE wrote:
I built a QRP version for my 49-er that works quite well.
At QRP levels is there an advantage or disadvantage to using wound toriods versus radial inductors (or even SMD), especially on the receive side? ? --
|
Can you tune in the AM station (with either your MFJ1622 or a length of wire) to test the rest of the system?
|
The only AM broadcast transmitter in Scottsdale is located @ 64th st. & Thomas rd.
KAZG 1440AM 5,000 W day, 52 W night
Are you close to that location?
|
Preston wrote :
"I am in a condo ... static ... periodic continuous tones"
It could also be RFI from a local source. If you can power the rig (receiver only) from a battery, put a whip antenna on it (or several feet of wire) and check the level of interference in your condo. Then go up to the roof and check, and out to the parking lot, and finally to the big park down the road. If there is much difference in the noise level between those different places ...
73,
... Martin VE3OAT
|
Preston:
There's an article (¡°A
Cheap and Easy BCI Filter¡±, CQ
Magazine,
August, 2016) that describes such a filter. I built a QRP version for my 49-er that works quite well. It cost be about $0.80 to build the QRP version (perf board works fine, of course):
As you can see, the insertion loss is very small, but it knocks the slats out of any BCI interference.
Jack, W8TEE
On Wednesday, November 13, 2019, 11:29:00 PM EST, Preston <preston.azcpapro@...> wrote:
I am in a condo in Scottsdale, and have tried my new Ubitx on a MFJ 1622 apartment antenna and on a 40 meter half wave center fed dipole.? All I am getting is static on every band with some periodic continuous tones, although it worked in Wisconsin with a dipole.? The ARRL video on Youtube about the Ubitx says at the end, that there is an AM station within a mile that causes problems with the receiver.? They say to buy or build a band pass filter.? I am wondering if this is my problem.? Has anyone run into this?? If so, is there a brand and model that has worked for you?
-- Jack, W8TEE
|
|
|
Indeed, if the AM station is on mediumwave a BCI filter (just a highpass filter) is the solution. I have had a similar issue with a religious FM channel I heard spread over the 144mhz band. A highpass filter was enough. I hope you can solve it equally well. It also depends on how clean is their TX. But they might be legally compliant (-43db? from the fundamental) but not enough for you.
Il 14/nov/2019 05:29, "Preston" < preston.azcpapro@...> ha scritto: I am in a condo in Scottsdale, and have tried my new Ubitx on a MFJ 1622 apartment antenna and on a 40 meter half wave center fed dipole.? All I am getting is static on every band with some periodic continuous tones, although it worked in Wisconsin with a dipole.? The ARRL video on Youtube about the Ubitx says at the end, that there is an AM station within a mile that causes problems with the receiver.? They say to buy or build a band pass filter.? I am wondering if this is my problem.? Has anyone run into this?? If so, is there a brand and model that has worked for you?
|
Ted
Preston
Ismo V??n?nen OH2FTG
MadRadioModder