Re: Cables for GE Mastr II S3V225UAUHA
Thanks for the update, it all makes sense.
Being a 'typical' amateur I'd have been looking at doing the split and combine in the absence of a professional device.
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Re: Cables for GE Mastr II S3V225UAUHA
The only time I've used amplifiers in parallel they had
measured sections of 75ohm [could have been 1/4 waves] to
split into and combine out of the PAs. Ray - if you've never worked on a high-power solid-state VHF or UHF Master II, they come with high-power Wilkinson splitter and combiner external to the PA's. Inside those units are quarter-wave sections of 75 ohm line (RG-302) and the 100 ohm floating resistor. The OP is asking about the length of cables that go to/from the splitters/combiners and the amplifiers which, since everything is already at 50 ohms, can be any length provided that the resulting RF from each PA arrives at the combiner in-phase. --- Jeff WN3A
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Re: Cables for GE Mastr II S3V225UAUHA
I have RG 214 ready to cut.
I was thinking the amps needed to be fed out of phase to
lessen the load on the power supply. How do you figure? Amplifiers consume DC power. They don't consume RF. The DC current being pulled by an amplifier operating an emission that lacks any amplitude variation (such as FM) will pull the same amount of current at any point in time. It's not like the DC current draw from the power supply varies at an RF rate. If it did, your power cables would likely be radiating more power than your antenna. --- Jeff WN3A
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Re: Cables for GE Mastr II S3V225UAUHA
The only time I've used amplifiers in parallel they had?measured sections?of 75ohm [could have been 1/4 waves] to split into and combine out of the PAs.
Just paralleling will present 25ohms to six points in the system which?are presumably expecting to see 50ohms. Having said this I have no experience with this specific system and it?may have been designed for simple paralleling.
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Re: Cables for GE Mastr II S3V225UAUHA
On 9/22/2018 6:36 AM, Bill Isom
bil.isom@... [Repeater-Builder] wrote:
I was thinking
the amps needed to be fed out of phase to lessen the load on the
power supply.
I thought that Quintron/Glenayre paging transmitters used this
technique.? 1/4 wave difference seems to come to mind.? It's been a
long time.....
Joe
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Re: Cables for GE Mastr II S3V225UAUHA
Thank you. I have RG 214 ready to cut. I was thinking the amps needed to be fed out of phase to lessen the load on the power supply.
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Re: Cables for GE Mastr II S3V225UAUHA
I need to know how to calculate the length of the splitter
and combiner cables. The splitters and combiner are Wilkinsons and are mounted on panels. The cables that go to/from them can be any length PROVIDED that the total length of the cable to and from amplifier A is the same as the total length of cable to/from amplifier B. The goal here is obviously that the RF from both amplifiers has to arrive at the combiner in-phase. The original factory cables were RG213 for whatever it's worth. I'd make them out of something better like RG214 or RG393. --- Jeff WN3A
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Thanks Jim. I hope it doesn't get past my giving them the "Larry David Look" and them revising the bill!
There needs to be some consumer service that reviews these bills routinely and levels the playing field for us. I have been putting off some surgery because frankly I don't know what % my insurance actually covers and cannot get a straight answer from the surgery center.
Well,? back to Repeater Building!
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Re: 3MHz Compact Duplexer
Take a look at the Bird / Tx Rx 30-37-01A,
30-37-02A, 30-37-03A and 30-37-04A series. The 01A and 02A will do a 3.0 MHz
split. The 03A and 04A will do a 1.5 MHz split. Unlike many duplexers, you
cannot reverse the tx and rx ports. The 01A and 03A are tx high and the 02A and
04A are tx low. These are small, lightweight and make for a great portable non
standard offset VHF high band (2M) repeater.Of late, these units have sold for
about $150 on eBay. Here's a link to get you started:
?
?
Rob K7TGU
Thanks, Rob. That is pretty much exactly what I was hoping to find. Not sure how I missed those in my previous searches. The transmit would be high so I'll keep a lookout for a 03A or 01A.
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Re: 3MHz Compact Duplexer
?
Here's a couple eBay listings that have ended.
Click on the "See original listing" link at the end of the listing title. These
are 30-37-92046-03A units. The 92046 in the model number refers to the water
proof enclosure in which the 30-37-03A is mounted.
?
?
?
Rob K7TGU
?
----- Original Message -----
Sent: Friday, September 21, 2018 4:59
PM
Subject: Re: [Repeater-Builder] 3MHz
Compact Duplexer
?
Take a look at the Bird / Tx Rx 30-37-01A,
30-37-02A, 30-37-03A and 30-37-04A series. The 01A and 02A will do a 3.0 MHz
split. The 03A and 04A will do a 1.5 MHz split. Unlike many duplexers, you
cannot reverse the tx and rx ports. The 01A and 03A are tx high and the 02A
and 04A are tx low. These are small, lightweight and make for a great portable
non standard offset VHF high band (2M) repeater.Of late, these units have sold
for about $150 on eBay. Here's a link to get you started:
?
?
Rob K7TGU
----- Original Message -----
Sent: Friday, September 21, 2018 8:04
AM
Subject: [Repeater-Builder] 3MHz
Compact Duplexer
I am looking at building a portable VHF amateur repeater but am having
some difficulty finding a compact or mobile type duplexer for the
application. Not necessarily wanting to buy one at the moment, just trying
to determine the specific model I would be looking for.
I have so far been limiting my search to well known, reputable duplexer
manufacturers and it appears for other than full size band pass/band reject
models the minimum separation is limited to around 4.5MHz, at best.
Depending on method of frequency selection I use I end up with either a
2.98MHz or 3.48MHz split that I would be using.
I am planning on using a Hamtronics T302 transmitter and R303 receiver.
The planned locations for use are relatively benign regarding RF, so I'm
thinking a notch only duplexer should be adequate. Still undecided if I
would use the output level of the T302 or if I would want to add a small
amplifier.
Can anyone recommend a duplexer?
Brett KQ9N
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Re: 3MHz Compact Duplexer
There are 3 VHF bands available to amateurs: 6 meters, 220 mhz, 2 meters. The.most logical choice for a portable VHF repeater is 220 mhz.
John Mackey, KS?F
CPBE-DRB-8VSB, CBNE
503-706-6506
???
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Re: 3MHz Compact Duplexer
Yeah, my bad!
73, Gary
On Friday, September 21, 2018 5:07 PM, "'Mark - N9WYS' n9wys@... [Repeater-Builder]" wrote:
?
Gary, ? I think he stated VHF, but I may be wrong¡. ? Mark ¨C N9WYS ?
From: Repeater-Builder@... [mailto:Repeater-Builder@...]
Sent: Friday, September 21, 2018 11:50 AM
To: Repeater-Builder@...
Subject: Re: [Repeater-Builder] 3MHz Compact Duplexer ? Silly question:? What band? On Friday, September 21, 2018 11:04 AM, "Brett Friermood brett.friermood@... [Repeater-Builder]" wrote: ? I am looking at building a portable VHF amateur repeater but am having some difficulty finding a compact or mobile type duplexer for the application. Not necessarily wanting to buy one at the moment, just trying to determine the specific model I would be looking for. I have so far been limiting my search to well known, reputable duplexer manufacturers and it appears for other than full size band pass/band reject models the minimum separation is limited to around 4.5MHz, at best. Depending on method of frequency selection I use I end up with either a 2.98MHz or 3.48MHz split that I would be using. I am planning on using a Hamtronics T302 transmitter and R303 receiver. The planned locations for use are relatively benign regarding RF, so I'm thinking a notch only duplexer should be adequate. Still undecided if I would use the output level of the T302 or if I would want to add a small amplifier. Can anyone recommend a duplexer? ?
Posted by: Gary HENDRICKSON
|
Re: 3MHz Compact Duplexer
?
Take a look at the Bird / Tx Rx 30-37-01A,
30-37-02A, 30-37-03A and 30-37-04A series. The 01A and 02A will do a 3.0 MHz
split. The 03A and 04A will do a 1.5 MHz split. Unlike many duplexers, you
cannot reverse the tx and rx ports. The 01A and 03A are tx high and the 02A and
04A are tx low. These are small, lightweight and make for a great portable non
standard offset VHF high band (2M) repeater.Of late, these units have sold for
about $150 on eBay. Here's a link to get you started:
?
?
Rob K7TGU
----- Original Message -----
Sent: Friday, September 21, 2018 8:04
AM
Subject: [Repeater-Builder] 3MHz Compact
Duplexer
I am looking at building a portable VHF amateur repeater but am having
some difficulty finding a compact or mobile type duplexer for the application.
Not necessarily wanting to buy one at the moment, just trying to determine the
specific model I would be looking for.
I have so far been limiting my search to well known, reputable duplexer
manufacturers and it appears for other than full size band pass/band reject
models the minimum separation is limited to around 4.5MHz, at best. Depending
on method of frequency selection I use I end up with either a 2.98MHz or
3.48MHz split that I would be using.
I am planning on using a Hamtronics T302 transmitter and R303 receiver.
The planned locations for use are relatively benign regarding RF, so I'm
thinking a notch only duplexer should be adequate. Still undecided if I would
use the output level of the T302 or if I would want to add a small
amplifier.
Can anyone recommend a duplexer?
Brett KQ9N
|
My wife is a professional medical biller and coder with more billing certifications behind her name than most DX-ers have extra call signs.
If you'd like, she can review your medical billing.? It's not gonna be free, and it's not gonna be cheap either, and I'll have to talk her into doing it first -- but she's got more professional ethics in her little finger than most medical organizations have in their entire "accounting" department.
She sees my medical bills before I do, and because of her, I get treated correctly when I go in for medical stuff.
73 Jim N6OTQ
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Link antenna polarization
Considering a VHF repeater with a typical vertically polarized omni antenna, linked via UHF, is there a case to made for choosing either vertical or horizontal polarization for the link yagis?
de Larry VO1FOG
|
Re: 3MHz Compact Duplexer
Gary, ? I think he stated VHF, but I may be wrong¡. ? Mark ¨C N9WYS ?
toggle quoted message
Show quoted text
From: Repeater-Builder@... [mailto:Repeater-Builder@...]
Sent: Friday, September 21, 2018 11:50 AM
To: Repeater-Builder@...
Subject: Re: [Repeater-Builder] 3MHz Compact Duplexer? Silly question:? What band? On Friday, September 21, 2018 11:04 AM, "Brett Friermood brett.friermood@... [Repeater-Builder]" wrote: ? I am looking at building a portable VHF amateur repeater but am having some difficulty finding a compact or mobile type duplexer for the application. Not necessarily wanting to buy one at the moment, just trying to determine the specific model I would be looking for. I have so far been limiting my search to well known, reputable duplexer manufacturers and it appears for other than full size band pass/band reject models the minimum separation is limited to around 4.5MHz, at best. Depending on method of frequency selection I use I end up with either a 2.98MHz or 3.48MHz split that I would be using. I am planning on using a Hamtronics T302 transmitter and R303 receiver. The planned locations for use are relatively benign regarding RF, so I'm thinking a notch only duplexer should be adequate. Still undecided if I would use the output level of the T302 or if I would want to add a small amplifier. Can anyone recommend a duplexer? ?
Posted by: Gary HENDRICKSON
|
A quick reply, and I¡¯ll leave this go. ? The hospitals don¡¯t like me¡? I have several chronic illnesses which require hospitalization from time to time, but for several years before I retired, I worked as a Medicaid Fraud Investigator for the State of Illinois.? When I call to question a billing issue, the hospital usually starts out being indignant with me ¨C like they¡¯re doing me a favor by merely talking to me. ?But, before the call ends, they are usually apologizing to me ¨C especially when they remember me from when I used to investigate Medicaid Fraud, and I remind them that I still have ¡°connections¡± I can reach out to for assistance.?? ? The ¡°funniest¡± times (for me) when I investigated Medicaid Fraud was when I¡¯d go to a hospital seeking records on a certain case¡? The person in Medical Records would always give me the standard, ¡°We can¡¯t provide that information because of HIPAA regulations.¡±? My immediate response was, ¡°I am a Medical Oversight Agency and am exempt from HIPAA restrictions.? Here is my authority letter from the Attorney General¡¯s Office.¡±? They¡¯d parry with, ¡°Well, we¡¯ll send this over to our legal department and get back to you.¡±? And them I¡¯d hit them with, ¡°OK.? No problem. I¡¯ll contact Public Aid and shut down your Medicaid payments until you comply with this request.¡±? I¡¯d walk out the door THAT AFTERNOON with the requested documentation¡ ?They certainly don¡¯t want to lose ANY funding.
? And many hospitals are starting to ask for payments ¡°up-front¡±¡ ?Mine is doing the same thing.? They tell you they have calculated your co-payment will be ¡°$ XX¡±¡? That¡¯s a bunch of BS.? I always tell them to bill the insurance and I¡¯ll worry about the co-pay afterward. ? Mark ¨C N9WYS ?
toggle quoted message
Show quoted text
From: Repeater-Builder@...
Sent: Friday, September 21, 2018 11:28 AM
To: Repeater-Builder@...
Subject: [Repeater-Builder] Re: Final notice?
At risk of getting OT
Hospitals are by far the worst? The hospital business is license to steal from the elderly, medicare and supplemental insurers.
Since my Dad passed away I have taken over my elderly Mom's bills. She has a lot of hospital visits per year and so I see a lot of hospital bills. First they send an estimated bill. That bill has yet to reach the insurance company so it is best not to pay it. 5 or 6 months later a bill will arrive and it will be accurate to the insurance EOB. However, several times they have submitted bills that were for hospitalizations 1 or 2 years prior and were asking for additional co pay. In fact they were "mistakes". One even went into collections. I pay attention to the DOS and keep a complete record of checks paid so these "mistakes" don't escape me. My mother on the other hand would pay these bills. I have spent long hours getting refunds for medical and ambulance bills that were paid twice.? Most recently she had a $102K hospitalization for 7 days "observation" from a fall. She actually gets sicker the longer that they hold her and that results in requiring 3 weeks rehab to recover from one week "observation". This last bill of $102K? for 7 days observation is over the top. The diagnosis code listed, was pneumonia. She did not have pneumonia.? I see the insurance company negotiated it way down, but the co pay is still hefty . I have asked for a detailed bill with diagnostic codes.
Also beware of billing clerks at the ER suggesting you pay the entire bill on credit card and that you will get a discount and your co pay deductible will be satisfied. I actually fell for that deal at our brand new local hospital. The insurance company settled for far less, the hospital overcharged me $1,200, the deductible was not satisfied, there was another $400 charge from an out of network doctor who "popped in". It took 5 months to uncover this scam. I went back to the ER and the billing clerk would not talk to me. Very crooked. They would have held onto my $1,200 had I not caught them.
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Guys,
?
As I mentioned here a
couple of weeks ago, I have several GE MASTR III 380 to 400 MHz repeaters, and
have decided to try to find new homes for them.?
I have also developed a complete frequency conversion for them, which
will provide for programming and using them anywhere in the 420 to 450 MHz ham
band.
?
These are all the later
vintage ¡°Advanced Digital Capable¡± (P25) versions with the white racing
stripes, and include the DSP Module.?
I¡¯ve tested them all on the bench, and all (except the one that I¡¯ve
already converted) are presently in working condition in their original 380 ¨C
400 MHz frequency range.
?
Before I start converting
all of the remaining ones to operate in the 440 ham band, I¡¯d like to know if
anybody out there would like any of the ?un-converted ones.? I¡¯ll wait a couple of weeks before I jump
into the wholesale conversion process, so contact me soon if you want to talk
about getting an un-converted one.
?
I also have a few of the
matching 100 Watt V21 RF Power Amplifiers that work over the entire 378 to 450
MHz range, tested and working.? These
amps require a 26 VDC power supply.? I
have a few of the newer 1 R/U high dual-voltage (13and 26 Volts) switching
power supplies, and several of the older, larger, 3 R/U high dual-voltage
supplies.
?
I also have one complete
earlier vintage 450 to 470 MHz M III?
repeater with the matching 12 VDC 110 Watt Power Amp, tested and
currently tuned up on 447.0-in/442.0-out.
?
And I have 2 VHF G2 early
vintage M III repeaters in their original 37¡± high GE cabinets, with the Wacom
duplexers.
?
With the exception of the
heavy 3 R/U power supplies, and the 37¡± tall VHF units, I think that everything
else is UPS shippable from here, ZIP 21144, just south of Baltimore, Md.? Or if you¡¯re within driving distance, you can
pick things up.?
?
If you like, I can
program these units before they go out.?
Just provide me with the programming specifications.
?
I also have some 380 to
400 MHz G.E. M7100 mobiles (according to the FCC ID on them, they cover from
378 to 430 MHz, but I don¡¯t know if that¡¯s in 1 ¡°band¡± or more than one), a
couple of complete M7100 desktop base stations, some desktop station cabinets
without the radios, and some M7100 mobile radios.
?
If interested, drop me an
email to W3DTN@... for prices
and shipping information.? I think the
prices are affordable.? I don¡¯t want this
to sound ¡°commercial¡±, as all of the proceeds go to Maryland MARS, Inc.
(MMARSI), a 501C3 non-profit.? Check out
our Internet auction site at MMARSI.org, where pictures of all of these items
appear.
?
73, Gary? W3DTN
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Re: 3MHz Compact Duplexer
Yep, sorry about that. My bad.
This would be the 144-148Mhz, 2m band.
It¡¯s a valid question.? Last I checked ham radio in ITU region 2 has three VHF bands, 50 MHz, 144 MHz and 222 MHz. -- Bryan Fields M: +1-727-409-1194
?
Silly answer:
"VHF amateur repeater"
Which is what he says right at the beginning.
Mick - W7CAT
----- Original Message -----
From: "Gary HENDRICKSON w3dtn@... [Repeater-Builder]"
To: "Repeater-Builder@..."
Sent: Friday, September 21, 2018 10:50:14 AM
Subject: Re: [Repeater-Builder] 3MHz Compact Duplexer
> Silly question:? What band?
>
> On Friday, September 21, 2018 11:04 AM, "Brett Friermood
brett.friermood@... [Repeater-Builder]" wrote:
>
>
> ? I am looking at building a portable VHF amateur repeater but am
having some difficulty finding a compact or mobile type duplexer for the
application. Not necessarily wanting to buy one at the moment, just
trying to determine the specific model I would be looking for.
> I have so far been limiting my search to well known, reputable
duplexer manufacturers and it appears for other than full size band
pass/band reject models the minimum separation is limited to around
4.5MHz, at best. Depending on method of frequency selection I use I end
up with either a 2.98MHz or 3..48MHz split that I would be using.
> I am planning on using a Hamtronics T302 transmitter and R303
receiver. The planned locations for use are relatively benign regarding
RF, so I'm thinking a notch only duplexer should be adequate. Still
undecided if I would use the output level of the T302 or if I would want
to add a small amplifier.
> Can anyone recommend a duplexer?
> Brett KQ9N #yiv0271390232
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Cables for GE Mastr II S3V225UAUHA
Thank all of you for the information I have received by reading your mail.
I have received a S3V225UAUHA 225 watt VHF repeater.? The rf cables are missing and I need to make new ones.? The 110 watt amplifier is split to feed two 130 watt amplifiers, then combined to feed the duplexer.??
I need to know how to calculate the length of the splitter and combiner cables.? I am assuming the 130 watt amplifiers need to be fed 90 degrees out of phase, but I would like to be sure.
I also have a similar UHF repeater that is next on my list.
Thank you
Bill Isom
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RFI-EMI-GUY
n9wys