Re: Fw: Re: [BITX20] BCI Filter
On Sun, Sep 23, 2018 at 07:38 PM, Jack Purdum wrote:
SoftwareControlledHamRadio groups.io Group
Looks like an interesting group.?
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Re: uBITX EXPLOR-AIR Retro Radio
Looks great! ? David A Posthuma, WD8PUO 1 (616) 283-7703 ?
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From: [email protected] <[email protected]> On Behalf Of abeckett@...
Sent: Sunday, September 23, 2018 11:14 PM
To: [email protected]
Subject: [BITX20] uBITX EXPLOR-AIR Retro Radio ? uBITX V3 built to resemble Lafayette KT-135 EXPLOR-AIR regenerative receiver.? Brings back the memories of the good old days of radio.? If interested, it is for sale.
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On Sun, Sep 23, 2018 at 01:41 PM, Vince Vielhaber wrote:
found a Low Pass Filter board out of a TS-940 Kenwood on ebay for $20.
This is a cool idea. I looked at some on eBay, judging from the pictures it looks like they are only an order 5 filter. Anyone know if these would be good enough as the only filters for the uBITX (bypassing the filters in the uBITX)? If used as an additional filter set after the inboard uBITX filter, likely any additional harmonic reduction these provide would bring the harmonics into spec (we should hope).? Tom, wb6b
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uBITX EXPLOR-AIR Retro Radio
uBITX V3 built to resemble Lafayette KT-135 EXPLOR-AIR regenerative receiver.? Brings back the memories of the good old days of radio.? If interested, it is for sale.
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Fw: Re: [BITX20] BCI Filter
Opps...pressed the wrong key. Source listed below:
----- Forwarded Message -----
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From: Jack Purdum <jjpurdum@...> Sent: Sunday, September 23, 2018, 10:36:21 PM EDT Subject: Re: [BITX20] BCI Filter
| | SoftwareControlledHamRadio groups.io GroupThis group is for anyone who is interested in using software in ham radio projects. |
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site. Just do a? search on "BCI filter". It cost me under a dollar to build but works very well. A "high power" version of the filter appeared in:
¡°A
Cheap and Easy BCI Filter¡±, CQ
Magazine,
August, 2016.
Jack, W8TEE
On Sunday, September 23, 2018, 6:37:43 PM EDT, Nick VK4PP <nickpullen@...> wrote:
Hi.?
Peter VK3YE did a video using some normal inductors to make a BCI filter.
73 Nick VK4PP
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Did you try doing a factory reset on the firmware? I use the CEC firmware and if you push the tuner knob in and turn on radio you¡¯ll get the option to reset firmware by following on screen prompts.?
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On Sep 23, 2018, at 6:41 PM, KM4TRT via Groups.Io < garello@...> wrote: Thanks for the reply.
? I realize that if nothing is going into the 2nd amp that nothing will come out.'I only said that because I have had experience where I could not find a signal at
some places because of? lead antennuation,
but was able to pick it? up further downstream in a less sensitive spot,.
To reiterate, I have the signal going into the 45 Mhz xtal but nothing reasonable coming out.? I should be getting the filtered 45Mhz signal going into the second mixer, right?
I did not change anything in the coil/cap structure, I only changed cal on the screen. (gui)
PS i was literally watching my signal disappear on the ICom waterfall display before I realized that my dummy load wasnt connected.
Andy
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| | SoftwareControlledHamRadio groups.io GroupThis group is for anyone who is interested in using software in ham radio projects. |
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site. A "high power" version of the filter appeared in:
On Sunday, September 23, 2018, 6:37:43 PM EDT, Nick VK4PP <nickpullen@...> wrote:
Hi.?
Peter VK3YE did a video using some normal inductors to make a BCI filter.
73 Nick VK4PP
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Re: Amplifier chain design - best practices
That¡¯s RV1 in the UBITX to adjust the drive level. RV2 is one of the bias pots for the finals.?
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On Sep 23, 2018, at 14:23, ajparent1/KB1GMX < kb1gmx@...> wrote: Gilles,
I've a factory unmodified uBitx, I wish to remain QRP and not to exceed 5 watts in emission (SSB). Is a simple modification possible?
Talk softer.? Or use RV2 to reduce power.
Beyond that nothing is simple.
Allison
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Re: K5BCQ uBITX Relay Switched LPF/BPF board
Hello Kees,
If still available, Please count me in for One complete 6x Kit.
I assume this is paypal?
Thanks for all the hard work in helping us move into compliance.
Gene N2IJF
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Hello Art,
A complete 6x kit includes: a 6x board, 12 relays, 6 blank LPF boards, headers, diodes, capacitors and a 6 position rotary switch for $30 plus $4 for postage in the USA.
73 Kees K5BCQ?
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On Sun, Sep 23, 2018 at 03:41 PM, KM4TRT wrote:
o reiterate, I have the signal going into the 45 Mhz xtal but nothing reasonable coming out.? I should be getting the filtered 45Mhz signal going into the second mixer, right?
If its the right frequency going in.? If not nothing.? Transmitting cant hurt the filter.
The amount of error you can have and get through the filter is about +-7.5khz!
However if the calibration software went off i space it could have stored something
totally wrong.
Now if it wasn't transmitting I'd suspect finals but no RX that a entirely different thing.
Allison
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Yes I agree. I believe the one I posted is similar, I don¡¯t the values just specs and the configuration is all the same. I¡¯m gonna give the rtl-sdr one a try as it gives you more of 160 plus it¡¯s SMD so has small footprint.?
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Thanks for the reply.
? I realize that if nothing is going into the 2nd amp that nothing will come out.'I only said that because I have had experience where I could not find a signal at
some places because of? lead antennuation,
but was able to pick it? up further downstream in a less sensitive spot,.
To reiterate, I have the signal going into the 45 Mhz xtal but nothing reasonable coming out.? I should be getting the filtered 45Mhz signal going into the second mixer, right?
I did not change anything in the coil/cap structure, I only changed cal on the screen. (gui)
PS i was literally watching my signal disappear on the ICom waterfall display before I realized that my dummy load wasnt connected.
Andy
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Hi.?
Peter VK3YE did a video using some normal inductors to make a BCI filter.
73 Nick VK4PP
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The QST article?QST Feb ¡®78 p22 BC-Band Energy ¡ª A Rejection Filter W3NQNis definitely aimed at diy. Seems like it might be an option that could be added and removed external to the rig as needed and would allow 160. Mostly just sharing the reference.
jt
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I found a Low Pass Filter board out of a TS-940 Kenwood on ebay for $20. It's good to 100W, selectable via 3 digital lines in 7 bands. The only downside is it's a 24v board. The bands are:
1.5 - 2.5
2.5 - 4.5
4.5 - 7.5
7.5 - 10.5
10.5 - 15.5
15.5 - 22.0
22.0 - 30.0
Oh, and it has FWD and REF outputs on it as well. I've seen many of these filters going for anywhere between $15 and $100 (the ones for $100 rarely sell) and are usually no problem to connect to your project.
Vince - K8ZW.
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On 09/23/2018 01:58 PM, Gordon Gibby wrote: Very cool.
I plan to get external filters for the 160 m band.
Or, since I really don¡¯t use the higher bands, maybe switch them around a bit.
Neat little rig, will do all kinds of cool things for me.
On Sep 23, 2018, at 13:31, Bill Cromwell <wrcromwell@...> wrote:
Hi Allison,
Little details seem to need a lot of refreshing here - as you often point out. I am using my uBitX on the air primarily for CW up through 17 meters (but no QSOs higher than 14 MHz so far). I use an external filter and will be using a better one (more convenient for field portable use) while I am working on an internal fix. Yes, one of the mods. I just got the board when I returned from a vacation.
The external filters might be a good idea even with internal mods to reduce trash even more. The external filters are pretty much painless AND being external may be re-used with other radios:) It's nothing new. Hams have been using them since the 40s or 50s - maybe earlier.
I am also (ab)using my uBitX as bench test gear :) I used it to identify broken parts in a PFR-3 and make the repairs. Two inductors had fractures in their windings and one transformer was installed backward! The uBitX with a scope probe where the antenna normally goes made the 'divide and conquer" process quick and easy. It served as a $120 signal tracer. And then I re-used my signal tracer as a two way radio :)
73,
Bill KU8H
On 09/22/2018 10:41 PM, ajparent1/KB1GMX wrote:
Doc sees horse,
He's dead Jim!
Spurs are less an issue for 20M and below.
External low pass or transmitting band pass filters are responsible way
to go.
Allison --
bark less - wag more
--
Michigan VHF Corp.
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Re: Amplifier chain design - best practices
On Sun, Sep 23, 2018 at 11:23 AM, ajparent1/KB1GMX wrote:
Gilles,
I've a factory unmodified uBitx, I wish to remain QRP and not to exceed 5 watts in emission (SSB). Is a simple modification possible?
Talk softer.? Or use RV2 to reduce power.
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?^^^^^^? should be RV1....
Beyond that nothing is simple.
Allison
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Re: Amplifier chain design - best practices
Gilles,
I've a factory unmodified uBitx, I wish to remain QRP and not to exceed 5 watts in emission (SSB). Is a simple modification possible?
Talk softer.? Or use RV2 to reduce power.
Beyond that nothing is simple.
Allison
|
Very cool.
I plan to get external filters for the 160 m band.
Or, since I really don¡¯t use the higher bands, maybe switch them around a bit.
Neat little rig, will do all kinds of cool things for me.
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Show quoted text
On Sep 23, 2018, at 13:31, Bill Cromwell <wrcromwell@...> wrote:
Hi Allison,
Little details seem to need a lot of refreshing here - as you often point out. I am using my uBitX on the air primarily for CW up through 17 meters (but no QSOs higher than 14 MHz so far). I use an external filter and will be using a better one (more convenient for field portable use) while I am working on an internal fix. Yes, one of the mods. I just got the board when I returned from a vacation.
The external filters might be a good idea even with internal mods to reduce trash even more. The external filters are pretty much painless AND being external may be re-used with other radios:) It's nothing new. Hams have been using them since the 40s or 50s - maybe earlier.
I am also (ab)using my uBitX as bench test gear :) I used it to identify broken parts in a PFR-3 and make the repairs. Two inductors had fractures in their windings and one transformer was installed backward! The uBitX with a scope probe where the antenna normally goes made the 'divide and conquer" process quick and easy. It served as a $120 signal tracer. And then I re-used my signal tracer as a two way radio :)
73,
Bill KU8H
On 09/22/2018 10:41 PM, ajparent1/KB1GMX wrote:
Doc sees horse,
He's dead Jim!
Spurs are less an issue for 20M and below.
External low pass or transmitting band pass filters are responsible way
to go.
Allison --
bark less - wag more
|
Re: Amplifier chain design - best practices
Hi,
I always heard "like pushing string". It's the same level of frustration.
73,
Bill KU8H
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On 09/23/2018 12:25 AM, K5ESS wrote: If there was ever an appropriate comparison, the now overused phrase
¡°like herding cats¡± fits the bill with regard to keeping these group
posts on topic.
Mike
K5ESS
*From:*[email protected] [mailto:[email protected]] *On Behalf Of
*ajparent1/KB1GMX
*Sent:* Saturday, September 22, 2018 2:21 PM
*To:* [email protected]
*Subject:* Re: [BITX20] Amplifier chain design - best practices
Did a count and nearly 50% of the posts in thsi string have nothing to
do with:
amplifier chain design - best practices.
About DBMs,
DBM drive levels
Low pass filters
Spectrum analyzer and probes.
K2 and its price.
SSD
QUCS
I might have forgotten a few.
Someone change the title to "WHATEVER/"
--
bark less - wag more
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David Posthuma
Skip Davis
Nick VK4PP
MadRadioModder