Re: COR Signal from HT1000 (or similar) for Remote Receiver
I have derived a COR from a handheld by placing the diode of an opto-isolator in series with the receive LED and using the transistor in the opto-isolator for the COR.? You can get a negative going signal by connecting the emitter to ground and having the collector go negative, or put the collector to a positive voltage and having the emitter go positive for the COR signal.
73 - Jim? W5ZIT
|
Re: Krystaly Rocks for MSR2000
expensive crystals but great radio that made..love the crisp audio on the HT220
toggle quoted message
Show quoted text
----- Original Message ----- From: geek dad <geek.dad@...> To: [email protected]Sent: Fri, 19 Feb 2021 06:47:23 -0700 (MST) Subject: Re: [repeater-builder] Krystaly Rocks for MSR2000 In had a set of Crystals made for my HT-220 from QuartSLab and they were $82 including shipping from the UK. Beautifully made and they have all the specs for Motorola radios. I installed them last weekend and they netted fine and work great.
|
That's great news. Glad you persisted.
Not one to be picky (who, me?) but the article does mention cleaning the solder pads and all leaked residue after the old caps have been removed, as well as after installing the new caps. It's in the finer print between some of the other steps. A toothbrush and 91% isopropyl alcohol is my "go-to" cleaner, as well as a dental pick to scrape off those hard-to-reach spots.
|
Good evening Bob & anyone else following-
Well, not one to give up (or perhaps not smart enough too), I printed off all the schematics I could find and literally taped them together to make larger prints so I could start following signal paths and maybe stumble into something.
U323 appears to be what controls the TX VCO line. I noticed on the board layout C344 is located right by it, and that is a cap that leaked out. I did clean right around the cap when I changed it, but not much further than that. For the heck of it, I cleaned that whole area again, giving all the pins on U323 a good scrub. The Q-TIP came up really dirty even though to the naked eye the area seemed clean.
I put the board back in and fired it up. I am happy to report the station has been running more than 24 hours continuously and the TX is staying locked solid!
The best-uneducated guess I have is that there was residual electrolyte causing issues on U323. Lesson learned- need to be extra vigilant cleaning up around leaked caps.
I'm going to still change that last one on the interconnect board since everything else is done. Then on to the final tuneup and hopefully get this station back into the wild!
Thanks to Bob and everyone for the help on this, it's been a great learning experience!
Tom
W9SRV
|
Re: The passing of an icon
If i may add,i think i add 2-3 contacts with Ted before,,,years ago.
he was a nice guy,a gentleman
may he rest in peace and add great contact outhere !
73/s?
Gervais ve2ckn
It is with great sadness that I have to report the passing of Ted Bleiman, K9MDM, AKA Lefty due to complications from CoVid-19, on Saturday February 20, 2021.
?
Those of us in the ham and radio communications community remember him for his days at SPECTRONICS and later MDM radio. Ted was the ¡°go to guy¡± for almost all the hard to find
2-way and repeater parts in the Chicago area (and maybe the country). His company motto was ¡° if it¡¯s in stock, we¡¯ve got it¡±
?
I knew Ted personally for quite a number of years, and he was the guy that was willing to help anyone any time with an electronic problem. Ted ¡°officially¡± retired from the business
about 5 years ago, but some of us knew he still had information to share, and occasionally a few VERY obscure parts!
?
Ted will be greatly missed by the electronics community as a whole and me personally (as my adopted uncle).
?
?
De Howard, N9KTW
|
Re: The passing of an icon
 Rest In Peace Ted... what a gentleman. One of the first people I met on RB to help me offline with projects and sourcing hard to find stuff nearly a decade ago. You will be missed.?
?On Sun, Feb 21, 2021 at 4:38 PM, Tom Parker < thp@...> wrote:
Although I didn't personally know Ted, I did
business with him, and he was a great, knowledgeable guy. He,
like a lot of us, will be greatly missed when we are gone... I
have a 38 yr old, EE, working in my shop and it is scary as hell
to think of him being a "go to guy" for our shop, not today, not
tomorrow, or any other day. I feel for our industry and our
county.
On 2/21/2021 5:46 PM, TGundo 2003 via
wrote:
Sad news- Ted was a fixture
of the industry, especially here in the Chicago area. I always
enjoyed my visits with him.
73's OM.
Tom
W9SRV
On Sunday, February 21, 2021, 05:30:06 PM CST, Howard
<n9ktw@...> wrote:
It
is with great sadness that I have to report the
passing of Ted Bleiman, K9MDM, AKA Lefty due to
complications from CoVid-19, on Saturday February 20,
2021.
Those
of us in the ham and radio communications community
remember him for his days at SPECTRONICS and later MDM
radio. Ted was the ¡°go to guy¡± for almost all the hard
to find 2-way and repeater parts in the Chicago area
(and maybe the country). His company motto was ¡° if
it¡¯s in stock, we¡¯ve got it¡±
I
knew Ted personally for quite a number of years, and
he was the guy that was willing to help anyone any
time with an electronic problem. Ted ¡°officially¡±
retired from the business about 5 years ago, but some
of us knew he still had information to share, and
occasionally a few VERY obscure parts!
Ted
will be greatly missed by the electronics community as
a whole and me personally (as my adopted uncle).
De
Howard, N9KTW
|
Re: The passing of an icon
I had a chance to visit "Lefty's Lair" a while back while he was in the process of moving south.? He was definitely a purveyor of the obscure and sometimes downright odd items.? He was certainly an old-school radio tech who believed in fixing anything you could - not like today's common parts-swappers.? I am sure he will be missed by many including Howard who has been giving Lefty a run for his money in the "vintage parts" stock competition over the last few years.
Dan Woodie, CETsr KC8ZUM
On Sun, Feb 21, 2021, 6:29 PM Howard < n9ktw@...> wrote: It is with great sadness that I have to report the passing of Ted Bleiman, K9MDM, AKA Lefty due to complications from CoVid-19, on Saturday February 20, 2021.
?
Those of us in the ham and radio communications community remember him for his days at SPECTRONICS and later MDM radio. Ted was the ¡°go to guy¡± for almost all the hard to find 2-way and repeater parts in the Chicago area (and maybe the country). His company motto was ¡° if it¡¯s in stock, we¡¯ve got it¡±
?
I knew Ted personally for quite a number of years, and he was the guy that was willing to help anyone any time with an electronic problem. Ted ¡°officially¡± retired from the business about 5 years ago, but some of us knew he still had information to share, and occasionally a few VERY obscure parts!
?
Ted will be greatly missed by the electronics community as a whole and me personally (as my adopted uncle).
?
?
De Howard, N9KTW
|
Circuit-wise, in an FM transmitter you are modulating an oscillator and are directly changing its frequency.
In a PM transmitter you do not modulate the oscillator -- it outputs a constant frequency.
But it's followed by an inductance or capacitance value that changes with modulation,
thus the audio is changing the phase of the signal. Using a reactance in this way
introduces pre-emphasis. So, we add pre-emphasis to FM to make it compatible with PM. Confusing matters are FM radio manufacturers which advertise "variable reactance modulation". That is clear as mud. A variable reactance such as a varactor in a VCO tank circuit or across a crystal will result in frequency modulation ("direct FM" if you please), and a varactor used in a phase-shift network that is effectively in series with RF the will vary the phase ("phase modulation" or PM). The emission resulting from PM is the same as FM with preemphasis applied across the entire baseband at a rate of 6 dB per octave (or 20 dB per decade if you please). As you might expect, a DC-coupled FM modulator has a response that extends down to DC, effectively becoming FSK (in the case of a PLL, loop filter response notwithstanding). PM can approach, but never reach, DC, in theory, and in practice, very low frequencies are difficult to faithfully reproduce in real-world analog implementations. --- Jeff WN3A -- This email has been checked for viruses by Avast antivirus software.
|
Re: The passing of an icon
Nice guy, I first met him in around 1973 from Spectronics days. Ted showed me an unusual use for his dishwasher. Cleaning crusty old Motrac control heads!
--
The Real RFI-EMI-GUY
|
Re: The passing of an icon
Very sad news indeed.. I bought 6 UHF 20W GE MVPs from Ted about 22 years ago, later some Redicom UHFs and a Redicom book, and other odds & ends over the years. When the 6 MVPs arrived there was a 7th in the box. Called back and asked if there was an oops, he said "Nope, just figured you could use another! My compliments!" Over the intervening years those radios served very well. Some to this day, others replaced by uMASTR II conversions. A good friend from our group also worked at Spectronics, you all may know him - Squeak (AD7K), then K7RBM. If not from Spectronics, you'd know him from long tenure at AES. He knew Ted well and speaks highly of him from his days in Chicago.
Despite the sub-optimal nature of the message, thank you for letting us know about Ted. He was as others agree a good man and pillar of our communications family. RIP.
73, Matt W6XC
On Sun, Feb 21, 2021 at 4:39 PM Tom Parker < thp@...> wrote:
Although I didn't personally know Ted, I did
business with him, and he was a great, knowledgeable guy.? He,
like a lot of us, will be greatly missed when we are gone... I
have a 38 yr old, EE, working in my shop and it is scary as hell
to think of him being a "go to guy" for our shop, not today, not
tomorrow, or any other day.? I feel for our industry and our
county.
On 2/21/2021 5:46 PM, TGundo 2003 via
wrote:
Sad news- Ted was a fixture
of the industry, especially here in the Chicago area. I always
enjoyed my visits with him.
73's OM.
Tom
W9SRV
On Sunday, February 21, 2021, 05:30:06 PM CST, Howard
<n9ktw@...> wrote:
It
is with great sadness that I have to report the
passing of Ted Bleiman, K9MDM, AKA Lefty due to
complications from CoVid-19, on Saturday February 20,
2021.
?
Those
of us in the ham and radio communications community
remember him for his days at SPECTRONICS and later MDM
radio. Ted was the ¡°go to guy¡± for almost all the hard
to find 2-way and repeater parts in the Chicago area
(and maybe the country). His company motto was ¡° if
it¡¯s in stock, we¡¯ve got it¡±
?
I
knew Ted personally for quite a number of years, and
he was the guy that was willing to help anyone any
time with an electronic problem. Ted ¡°officially¡±
retired from the business about 5 years ago, but some
of us knew he still had information to share, and
occasionally a few VERY obscure parts!
?
Ted
will be greatly missed by the electronics community as
a whole and me personally (as my adopted uncle).
?
?
De
Howard, N9KTW
|
Re: COR Signal from HT1000 (or similar) for Remote Receiver
I did something similar with an MX300 years ago. Like Andy said, these radios usually have a Bridge Tied Load speaker output. They float at about 1/2 VCC when the radio unmutes and so that point can be used to drive a transistor inverter to give low going COR.
The radio wants to see a speaker load so a small audio isolation transformer would be ideal. In no case should either speaker lead go directly to ground.?
In my case with the MX300, it was bottled up in a shield with nice feedthrough LC filters and for that reason the radio had a chirp when unmuting. So I put a cap of about .05 uF across the speaker leads to balance them and it was happy.
--
The Real RFI-EMI-GUY
|
Re: The passing of an icon
Although I didn't personally know Ted, I did
business with him, and he was a great, knowledgeable guy.? He,
like a lot of us, will be greatly missed when we are gone... I
have a 38 yr old, EE, working in my shop and it is scary as hell
to think of him being a "go to guy" for our shop, not today, not
tomorrow, or any other day.? I feel for our industry and our
county.
On 2/21/2021 5:46 PM, TGundo 2003 via
groups.io wrote:
toggle quoted message
Show quoted text
Sad news- Ted was a fixture
of the industry, especially here in the Chicago area. I always
enjoyed my visits with him.
73's OM.
Tom
W9SRV
On Sunday, February 21, 2021, 05:30:06 PM CST, Howard
<n9ktw@...> wrote:
It
is with great sadness that I have to report the
passing of Ted Bleiman, K9MDM, AKA Lefty due to
complications from CoVid-19, on Saturday February 20,
2021.
?
Those
of us in the ham and radio communications community
remember him for his days at SPECTRONICS and later MDM
radio. Ted was the ¡°go to guy¡± for almost all the hard
to find 2-way and repeater parts in the Chicago area
(and maybe the country). His company motto was ¡° if
it¡¯s in stock, we¡¯ve got it¡±
?
I
knew Ted personally for quite a number of years, and
he was the guy that was willing to help anyone any
time with an electronic problem. Ted ¡°officially¡±
retired from the business about 5 years ago, but some
of us knew he still had information to share, and
occasionally a few VERY obscure parts!
?
Ted
will be greatly missed by the electronics community as
a whole and me personally (as my adopted uncle).
?
?
De
Howard, N9KTW
|
Circuit-wise, in an FM transmitter you are modulating an
oscillator and are directly changing its frequency. In a
PM transmitter you do not modulate the oscillator -- it outputs a
constant frequency. But it's followed by an inductance or
capacitance value that changes with modulation, thus the audio is
changing the phase of the signal. Using a reactance in
this way introduces pre-emphasis. So, we add pre-emphasis to FM to
make it compatible with PM.
73,
Bob
On 2/21/2021 4:46 PM, Mike Fahmie via
groups.io wrote:
toggle quoted message
Show quoted text
True FM is achieved by
actually modulating the carrier's FREQUENCY. 'UnTrue FM' is
usually achieved by modulating the PHASE of a fixed carrier
and properly shaping the audio frequency response of the mic
amplifier.? The two methods should be indistinguishable over
the normal voice spectrum but 'UnTrue FM' becomes impractical
at very low audio frequencies.
-Mike-
WA6ZTY
On Sunday, February 21, 2021, 03:31:38 PM PST, KA9QJG
<ka9qjg@...> wrote:
?
?
As?? Ham radio
operators, some people getting into Amateur
radio and others for some reason think We know
everything WOW I wonder where? they? get that
from, LOL that¡¯s almost as? bad as saying Ham
Radio operators are cheap too
?
Well, over the
years, with all the neighbors seeing? Me
climbing trees and putting up antennas and? Me
telling all about the great things we do in
ham radio trying to save the world from all
the disasters providing Emergency
Communications,
?
?? I ask if I can
use their trees too. Everyone said, ok. ?Then
they see me and ask me to fix everything from
toasters, microwaves. Wifes curling iron, tv,
cell, tablets and computers, and the list go
on and on. I refuse? some and will not even
post what they were, LOL
?
So, After all, my
rambling on a? 14 in? Snow now 14 deg winter
afternoon in N/W Indiana, ?
?
? Finally,? if you
are still here, this is ?My excuse for taking
up bandwidth... ?For over 30 yrs and thanks to
this group, I have been building and still
using repeaters; Some have to hear me say well
back in the day, some of the transmitters were
advertised as? True FM; One evening on the
repeater Tech Net, ??A newly Lic Ham ask what
is real FM. His BO-Thing must not be accurate.
Without going into the thoughts of? BO-Thing
?not being much of anything? True,
?
I honestly did not
answer this, So This is my question that
someone on here should put in layman terms for
Me. So what is True FM? Vs.? Whatever FM
?
Everyone Stay safe
and Healthy
?
Don KA9QJG
|
Hi Don,
>So
what is True FM? Vs.? Whatever FM
"True FM" is a silly term, in my opinion. It's used by folks who
want to strongly distinguish FM from PM. Why they can't simply use
"FM" or "PM" to indicate what they mean, I don't know. Both are
forms of angle modulation and they're mathematically related.
Simply put, FM is not pre-emphasized by nature and PM is. When you
add pre-emphasis to FM, it's indistinguishable from PM. However,
the way a lot of commercial radios are designed can make it tough
to get really good audio through repeaters and links without
modifications, hence all the back-and-forth over circuit values,
the "right way" to do things, etc. Hearsay and opinions have made
the whole topic more complicated than it needs to be.
73,
Bob, WA9FBO
On 2/21/2021 4:31 PM, KA9QJG wrote:
toggle quoted message
Show quoted text
?
?
As??
Ham radio operators, some people getting into Amateur
radio and others for some reason think We know
everything WOW I wonder where? they? get that from, LOL
that¡¯s almost as? bad as saying Ham Radio operators are
cheap too
?
Well,
over the years, with all the neighbors seeing? Me
climbing trees and putting up antennas and? Me telling
all about the great things we do in ham radio trying to
save the world from all the disasters providing
Emergency Communications,
?
??
I ask if I can use their trees too. Everyone said, ok.
?Then they see me and ask me to fix everything from
toasters, microwaves. Wifes curling iron, tv, cell,
tablets and computers, and the list go on and on. I
refuse? some and will not even post what they were, LOL
?
So,
After all, my rambling on a? 14 in? Snow now 14 deg
winter afternoon in N/W Indiana, ?
?
?
Finally,? if you are still here, this is ?My excuse for
taking up bandwidth... ?For over 30 yrs and thanks to
this group, I have been building and still using
repeaters; Some have to hear me say well back in the
day, some of the transmitters were advertised as? True
FM; One evening on the repeater Tech Net, ??A newly Lic
Ham ask what is real FM. His BO-Thing must not be
accurate. Without going into the thoughts of? BO-Thing
?not being much of anything? True,
?
I honestly did not answer this, So This is my question
that someone on here should put in layman terms for Me.
So what is True FM? Vs.? Whatever FM
?
Everyone
Stay safe and Healthy
?
Don
KA9QJG
|
True FM is achieved by actually modulating the carrier's FREQUENCY. 'UnTrue FM' is usually achieved by modulating the PHASE of a fixed carrier and properly shaping the audio frequency response of the mic amplifier.? The two methods should be indistinguishable over the normal voice spectrum but 'UnTrue FM' becomes impractical at very low audio frequencies. -Mike- WA6ZTY
On Sunday, February 21, 2021, 03:31:38 PM PST, KA9QJG <ka9qjg@...> wrote:
? ? As?? Ham radio operators, some people getting into Amateur radio and others for some reason think We know everything WOW I wonder where? they? get that from, LOL that¡¯s almost as? bad as saying Ham Radio operators are cheap too ? Well, over the years, with all the neighbors seeing? Me climbing trees and putting up antennas and? Me telling all about the great things we do in ham radio trying to save the world from all the disasters providing Emergency Communications, ? ?? I ask if I can use their trees too. Everyone said, ok. ?Then they see me and ask me to fix everything from toasters, microwaves. Wifes curling iron, tv, cell, tablets and computers, and the list go on and on. I refuse? some and will not even post what they were, LOL ? So, After all, my rambling on a? 14 in? Snow now 14 deg winter afternoon in N/W Indiana, ? ? ? Finally,? if you are still here, this is ?My excuse for taking up bandwidth... ?For over 30 yrs and thanks to this group, I have been building and still using repeaters; Some have to hear me say well back in the day, some of the transmitters were advertised as? True FM; One evening on the repeater Tech Net, ??A newly Lic Ham ask what is real FM. His BO-Thing must not be accurate. Without going into the thoughts of? BO-Thing ?not being much of anything? True, ? I honestly did not answer this, So This is my question that someone on here should put in layman terms for Me. So what is True FM? Vs.? Whatever FM ? Everyone Stay safe and Healthy ? Don KA9QJG
|
Re: The passing of an icon
Sad news- Ted was a fixture of the industry, especially here in the Chicago area. I always enjoyed my visits with him.
73's OM.
Tom W9SRV
On Sunday, February 21, 2021, 05:30:06 PM CST, Howard <n9ktw@...> wrote:
It is with great sadness that I have to report the passing of Ted Bleiman, K9MDM, AKA Lefty due to complications from CoVid-19, on Saturday February 20, 2021.
?
Those of us in the ham and radio communications community remember him for his days at SPECTRONICS and later MDM radio. Ted was the ¡°go to guy¡± for almost all the hard to find 2-way and repeater parts in the Chicago area (and maybe the country). His company motto was ¡° if it¡¯s in stock, we¡¯ve got it¡±
?
I knew Ted personally for quite a number of years, and he was the guy that was willing to help anyone any time with an electronic problem. Ted ¡°officially¡± retired from the business about 5 years ago, but some of us knew he still had information to share, and occasionally a few VERY obscure parts!
?
Ted will be greatly missed by the electronics community as a whole and me personally (as my adopted uncle).
?
?
De Howard, N9KTW
|
? ? As?? Ham radio operators, some people getting into Amateur radio and others for some reason think We know everything WOW I wonder where? they? get that from, LOL that¡¯s almost as? bad as saying Ham Radio operators are cheap too ? Well, over the years, with all the neighbors seeing? Me climbing trees and putting up antennas and? Me telling all about the great things we do in ham radio trying to save the world from all the disasters providing Emergency Communications, ? ?? I ask if I can use their trees too. Everyone said, ok. ?Then they see me and ask me to fix everything from toasters, microwaves. Wifes curling iron, tv, cell, tablets and computers, and the list go on and on. I refuse? some and will not even post what they were, LOL ? So, After all, my rambling on a? 14 in? Snow now 14 deg winter afternoon in N/W Indiana, ? ? ? Finally,? if you are still here, this is ?My excuse for taking up bandwidth... ?For over 30 yrs and thanks to this group, I have been building and still using repeaters; Some have to hear me say well back in the day, some of the transmitters were advertised as? True FM; One evening on the repeater Tech Net, ??A newly Lic Ham ask what is real FM. His BO-Thing must not be accurate. Without going into the thoughts of? BO-Thing ?not being much of anything? True, ? I honestly did not answer this, So This is my question that someone on here should put in layman terms for Me. So what is True FM? Vs.? Whatever FM ? Everyone Stay safe and Healthy ? Don KA9QJG
|
It is with great sadness that I have to report the passing of Ted Bleiman, K9MDM, AKA Lefty due to complications from CoVid-19, on Saturday February 20, 2021.
?
Those of us in the ham and radio communications community remember him for his days at SPECTRONICS and later MDM radio. Ted was the ¡°go to guy¡± for almost all the hard to find 2-way and repeater parts in the Chicago area (and maybe the country). His company motto was ¡° if it¡¯s in stock, we¡¯ve got it¡±
?
I knew Ted personally for quite a number of years, and he was the guy that was willing to help anyone any time with an electronic problem. Ted ¡°officially¡± retired from the business about 5 years ago, but some of us knew he still had information to share, and occasionally a few VERY obscure parts!
?
Ted will be greatly missed by the electronics community as a whole and me personally (as my adopted uncle).
?
?
De Howard, N9KTW
|
Anyone using FM mode on the Repeater Builder STM32 MMDVM board with an MSF5000?
Now that FM mode is available on the V3 card, I'm thinking about using it as an external controller on my MSF5000 repeater.? I just updated my V3 card with the latest software, and upgraded to the latest Pi-Star image and am ready to build an interface cable for the MSF 5000.
I'm finding little data online about the FM mode, so reaching out here.
Has anyone got these 2 devices connected together and working FM plus digital modes?? Any info on how difficult it is to integrate and how well it works would be appreciated.
Ron
KA3JIJ
|
Re: COR Signal from HT1000 (or similar) for Remote Receiver
I haven¡¯t done it with the HT1000 radios but I did create a back to back link one time using MT1000 radios.? IIRC the MT1000 put a DC voltage on the speaker output when the audio was being passed and I used it as the COR. Just an FYI - I would not recommend using any portable radio for a high duty transmit application. ? Andy / NC4AB ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Troy Lousen
Sent: Sunday, February 21, 2021 3:56 PM
To: [email protected]
Subject: [repeater-builder] COR Signal from HT1000 (or similar) for Remote Receiver? I am looking at options for a remote receiver project (receive on VHF - link to primary transmitter on UHF).? The project requires very low power consumption since there is no utility power at the site.?? I have seen some references indicating that a pair of Motorola HT1000 Radios could work well for this.? Has anyone done this and found a good way to obtain the COR indication to be sent to a controller (possibly an ID-O-Matic)? Any other thoughts on what people have done similar to this even with different radios are welcome.? Cost is an issue, but probably could spend a couple hundred dollars per radio if there is a better approach.
--
Troy Lousen
N7KAM
Spokane? WA
|
Bob M.
Gervais Fillion
RFI-EMI-GUY
Matt Lechliter