Re: [Repeater-Builder] second radio to MASTR II base

[Mike Morris WA6ILQ]

At 04:39 PM 02/06/10, you wrote:
>Can one hook a second transeiver to a MII repeater without a 
>controller. I dont care if it is active all the time. I just want to 
>know how to hook one up to the back plane. I also have the SQ 
>operated relay installed.

What exactly do you want to do?
Two receivers?   Two transmitters?  One having priority over the other?
Mix the receivers, have both transmitters on at the same time, or what?

You requirements will determine if you can scratch your itch with the
functionality that is in the basic radio.

Mike

RE: [Repeater-Builder] NewBy

[Mark]

Welcome, Steve!  

You'll find this list is a wealth of information when you decide to build a
repeater, or for most other discussions of technical nature.

Great bunch of guys here!

73 de Mark - N9WYS

-Original Message-
From: Repeater-Builder@yahoogroups.com On Behalf Of bainbridge_steve

Hi
Iam a new user to the group. My name is Steve licenced
radio amateur M1SWB and I live in Liverpool UK.
Main interests are building repeaters and fixing them :-)
Iam currently building a 6mtr unit and need a Procom
DPF 6/6 HX-150 duplexer, so if anyone has such a beast
for sale, please contact me.

73

Steve

RE: [Repeater-Builder] RFS TDE-7780A

[no6b]

At 2/6/2010 20:08, you wrote:

>Oh, forgot to mention.  If you turn your unit upside-down, you should see
>rubber plugs near the fed ends of each resonator.  You can fine-tweak the
>taps through these holes.  It's pretty easy to break a wire, so I wouldn't
>recommend you go in there and start twistin' and tweakin' with any
>significant amount of force.  Adjusting the distance of the tap wire (center
>conductor) from the resonator will have a small, but measurable, effect on
>insertion loss and return loss.
>
>3MB JPEG of a disassembled PD633:
>
>http://www.broadsci.com/foo/IMG_6010.jpg

Never completely disassembled one, so nice to see what's inside - thanks 
for posting the nice pic.

>3MB JPEG showing what happens when you mis-tune or over-power one of these
>duplexers (capacitive loading slug and teflon insulator fried) - they are
>NOT very forgiving:
>
>http://www.broadsci.com/foo/IMG_6031.jpg

Let me guess: this was removed from the resonator nearest to the TX 
port.  I did this to one years ago, though the damage was not as 
dramatic.  We were increasing the power beyond 50 watts & saw something 
happen at about 80 watts, so we shut down & took it out of service 
immediately.  The teflon insulator had arced through the longer thin 
section & looked a lot like the one in your picture, maybe not quite as 
much charring visible.  Fortunately the tuning slug was not damaged.  I 
ended up cleaning out the insulator the best I could & swapping it with the 
one in the TX resonator closest to the antenna port.

Most mobile duplexers are rated for 50 watts max. TX power.  That rating is 
quite accurate.

Bob NO6B

Re: [Repeater-Builder] PURC Lowband station SCR replacement

[allan crites]

Joe,
The M9349 is an RCA 2N3525.
AC

--- On Sat, 2/6/10, Joe  wrote:


From: Joe 
Subject: [Repeater-Builder] PURC Lowband station SCR replacement
To: Repeater-Builder@yahoogroups.com
Date: Saturday, February 6, 2010, 5:07 PM


  



Just a long shot

We are repairing a PURC high power base station that uses an SCR marked 
9349 for switching a bias voltage. Anyone know of a source or 
replacement for the Motorola 9349 SCR?

Thanks,
Joe

RE: [Repeater-Builder] RFS TDE-7780A

[Jeff DePolo]

Oh, forgot to mention.  If you turn your unit upside-down, you should see
rubber plugs near the fed ends of each resonator.  You can fine-tweak the
taps through these holes.  It's pretty easy to break a wire, so I wouldn't
recommend you go in there and start twistin' and tweakin' with any
significant amount of force.  Adjusting the distance of the tap wire (center
conductor) from the resonator will have a small, but measurable, effect on
insertion loss and return loss.

3MB JPEG of a disassembled PD633: 

http://www.broadsci.com/foo/IMG_6010.jpg

3MB JPEG showing what happens when you mis-tune or over-power one of these
duplexers (capacitive loading slug and teflon insulator fried) - they are
NOT very forgiving:

http://www.broadsci.com/foo/IMG_6031.jpg

--- Jeff WN3A
 

> -Original Message-
> From: Repeater-Builder@yahoogroups.com 
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Jeff DePolo
> Sent: Saturday, February 06, 2010 10:55 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: RE: [Repeater-Builder] RFS TDE-7780A
> 
>   
> 
> 
> I've disassembled and compared the ham-split PD633-6A-1N and 
> regular 450-470
> PD633-6A-2N. The resonators are identical; they're the same 
> length. The
> difference is where they are tapped - the low-split model is 
> tapped about
> 1/4" further up the resonator than the 460 MHz version. The semi-rigid
> interconnect cables are slightly longer on the low-split 
> model as you might
> expect. I took pictures and started writing it up as an 
> article but never
> finished...
> 
> --- Jeff WN3A
> 
> > -Original Message-
> > From: Repeater-Builder@yahoogroups.com 
>   
> > [mailto:Repeater-Builder@yahoogroups.com 
>  ] On Behalf Of Joe
> > Sent: Saturday, February 06, 2010 9:45 PM
> > To: Repeater-Builder@yahoogroups.com 
>  
> > Subject: Re: [Repeater-Builder] RFS TDE-7780A
> > 
> > 
> > 
> > I wonder what they do to the internal coupling at the factory 
> > when they 
> > tune them. Maybe it is something that can be done in the 
> field with a 
> > little surgery?
> > 
> > Joe
> > 
> > Eric Lemmon wrote:
> > > Point taken. One factor that will directly affect how the 
> > subject duplexer
> > > will perform at 70cm is where the original factory tuning 
> > was. For example,
> > > if the factory tuning was in the 450-455 MHz band, such a 
> > duplexer will
> > > likely perform better at 70cm than will a duplexer that 
> > originally was
> > > factory-tuned for the 460-465 MHz band. The results I 
> > quoted were for a
> > > duplexer in the latter class.
> > >
> > > 73, Eric Lemmon WB6FLY
> > >
> > >
> > > -Original Message-
> > > From: Repeater-Builder@yahoogroups.com 
>   
> >  
> > > [mailto:Repeater-Builder@yahoogroups.com 
>   
> >  ] On Behalf Of Joe
> > > Sent: Saturday, February 06, 2010 2:59 PM
> > > To: Repeater-Builder@yahoogroups.com 
>   
> >  
> > > Subject: Re: [Repeater-Builder] RFS TDE-7780A
> > >
> > > 
> > >
> > > Correct, but if I remember you were claiming 3dB loss at the pass 
> > > frequencies. I was seeing about 1.5dB loss. I claimed respectable 
> > > results, not perfect results. I think it is still 
> > acceptable for ham 
> > > use. Everything is a compromise when you push the equipment 
> > past its 
> > > limits, but the typical ham is frugal (aka me) and 
> accepts a little 
> > > degradation for economy.
> > >
> > > 73, Joe, K1ike
> > > Another parsimonious Yankee ham.
> > >
> > > 73, Joe, K1ike
> > >
> > > 
> > 
> > 
> > 
> > 
> > 
> > No virus found in this incoming message.
> > Checked by AVG - www.avg.com
> > Version: 8.5.435 / Virus Database: 271.1.1/2640 - Release 
> > Date: 02/06/10 07:35:00
> > 
> > 
> > 
> 
> 
> 
> 
> 
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.435 / Virus Database: 271.1.1/2640 - Release 
> Date: 02/06/10 07:35:00
> 
> 
> 

RE: [Repeater-Builder] RFS TDE-7780A

[Jeff DePolo]

I've disassembled and compared the ham-split PD633-6A-1N and regular 450-470
PD633-6A-2N.  The resonators are identical; they're the same length.  The
difference is where they are tapped - the low-split model is tapped about
1/4" further up the resonator than the 460 MHz version.  The semi-rigid
interconnect cables are slightly longer on the low-split model as you might
expect.  I took pictures and started writing it up as an article but never
finished...

--- Jeff WN3A


> -Original Message-
> From: Repeater-Builder@yahoogroups.com 
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe
> Sent: Saturday, February 06, 2010 9:45 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] RFS TDE-7780A
> 
>   
> 
> I wonder what they do to the internal coupling at the factory 
> when they 
> tune them. Maybe it is something that can be done in the field with a 
> little surgery?
> 
> Joe
> 
> Eric Lemmon wrote:
> > Point taken. One factor that will directly affect how the 
> subject duplexer
> > will perform at 70cm is where the original factory tuning 
> was. For example,
> > if the factory tuning was in the 450-455 MHz band, such a 
> duplexer will
> > likely perform better at 70cm than will a duplexer that 
> originally was
> > factory-tuned for the 460-465 MHz band. The results I 
> quoted were for a
> > duplexer in the latter class.
> >
> > 73, Eric Lemmon WB6FLY
> >
> >
> > -Original Message-
> > From: Repeater-Builder@yahoogroups.com 
>  
> > [mailto:Repeater-Builder@yahoogroups.com 
>  ] On Behalf Of Joe
> > Sent: Saturday, February 06, 2010 2:59 PM
> > To: Repeater-Builder@yahoogroups.com 
>  
> > Subject: Re: [Repeater-Builder] RFS TDE-7780A
> >
> > 
> >
> > Correct, but if I remember you were claiming 3dB loss at the pass 
> > frequencies. I was seeing about 1.5dB loss. I claimed respectable 
> > results, not perfect results. I think it is still 
> acceptable for ham 
> > use. Everything is a compromise when you push the equipment 
> past its 
> > limits, but the typical ham is frugal (aka me) and accepts a little 
> > degradation for economy.
> >
> > 73, Joe, K1ike
> > Another parsimonious Yankee ham.
> >
> > 73, Joe, K1ike
> >
> > 
> 
> 
> 
> 
> 
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.435 / Virus Database: 271.1.1/2640 - Release 
> Date: 02/06/10 07:35:00
> 
> 
> 

Re: [Repeater-Builder] RFS TDE-7780A

[Joe]

I wonder what they do to the internal coupling at the factory when they 
tune them.  Maybe it is something that can be done in the field with a 
little surgery?

Joe

Eric Lemmon wrote:
> Point taken.  One factor that will directly affect how the subject duplexer
> will perform at 70cm is where the original factory tuning was.  For example,
> if the factory tuning was in the 450-455 MHz band, such a duplexer will
> likely perform better at 70cm than will a duplexer that originally was
> factory-tuned for the 460-465 MHz band.  The results I quoted were for a
> duplexer in the latter class.
>
> 73, Eric Lemmon WB6FLY
>
>
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe
> Sent: Saturday, February 06, 2010 2:59 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] RFS TDE-7780A
>
>   
>
> Correct, but if I remember you were claiming 3dB loss at the pass 
> frequencies. I was seeing about 1.5dB loss. I claimed respectable 
> results, not perfect results. I think it is still acceptable for ham 
> use. Everything is a compromise when you push the equipment past its 
> limits, but the typical ham is frugal (aka me) and accepts a little 
> degradation for economy.
>
> 73, Joe, K1ike
> Another parsimonious Yankee ham.
>
> 73, Joe, K1ike
>
>   

RE: [Repeater-Builder] RFS TDE-7780A

[Eric Lemmon]

Point taken.  One factor that will directly affect how the subject duplexer
will perform at 70cm is where the original factory tuning was.  For example,
if the factory tuning was in the 450-455 MHz band, such a duplexer will
likely perform better at 70cm than will a duplexer that originally was
factory-tuned for the 460-465 MHz band.  The results I quoted were for a
duplexer in the latter class.

73, Eric Lemmon WB6FLY


-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe
Sent: Saturday, February 06, 2010 2:59 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] RFS TDE-7780A

  

Correct, but if I remember you were claiming 3dB loss at the pass 
frequencies. I was seeing about 1.5dB loss. I claimed respectable 
results, not perfect results. I think it is still acceptable for ham 
use. Everything is a compromise when you push the equipment past its 
limits, but the typical ham is frugal (aka me) and accepts a little 
degradation for economy.

73, Joe, K1ike
Another parsimonious Yankee ham.

73, Joe, K1ike

Eric Lemmon wrote:
> Joe,
>
> Your screen shots actually prove my point. Both of the pass plots reveal
> that your duplexer's pass response is far from optimum, which is precisely
> the reason for selecting the proper duplexer model to tune. If your
> duplexer was originally designed for operation in the 440-450 MHz band,
the
> peak of the pass plots and the nadir of the notch plots would be exactly 5
> MHz apart. Your TX pass plot shows that the peak is about 900 kHz to the
> left of your desired frequency, and your RX pass plot shows that the peak
is
> off-scale to the right- considerably more than a MHz away from the desired
> frequency.
>
> 73, Eric Lemmon WB6FLY
>
>
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
 
> [mailto:Repeater-Builder@yahoogroups.com
 ] On Behalf Of Joe
> Sent: Friday, February 05, 2010 6:55 PM
> To: Repeater-Builder@yahoogroups.com
 
> Subject: Re: [Repeater-Builder] RFS TDE-7780A
>
> 
>
> Eric,
>
> I tuned up a 633-6A from a GR-300 recently and got some respectable 
> results. Pass frequency loss was around -1.5dB and notch loss was 
> around -85 to -90dB. I've attached the sweeps.
>
> 73, Joe, K1ike
>
> Eric Lemmon wrote:
> 
>> Paul,
>>
>> The Motorola TDE7780A duplexer is simply a relabeled Celwave 633-6A-2N
>> 
> unit,
> 
>> and it is designed for 450-470 MHz. It is the standard duplexer furnished
>> in GR300, GR1225, RKR1225, and CDR700 repeaters. The duplexer is okay for
>> non-critical use at low-density RF sites, such as at construction sites.
>> The compact mobile notch design has very little bandpass action, since
its
>> operation is based solely upon the notch.
>>
>> I have tried to tune such duplexers down into the Amateur 70cm band, with
>> little success.
>> 
>
>  
>
>
>
> 
>
>
>
> Yahoo! Groups Links
>
>
>
>
> 

[Repeater-Builder] second radio to MASTR II base

[n0fpe]

Can one hook a second transeiver to a MII repeater without a controller. I dont 
care if it is active all the time. I just want to know how to hook one up to 
the back plane. I also have the SQ operated relay installed.

Re: [Repeater-Builder] Master 2 and DCS

[gervais]

humm Doug
i thaught it would simpler for me too install this board,,,
i wonder if the little TKR-720 of Kenwood can do DCS???
Thanks for your observation

gervais
ve2ckn


--
From: "Doug Bade" 
Sent: Saturday, February 06, 2010 3:04 PM
To: 
Subject: Re: [Repeater-Builder] Master 2 and DCS

> There used to be an add on board from Comm Spec that could add 
> DCS/DCG/DPL to a suitable radio. Many aftermarket repeater controllers 
> can do DCG/DCS.
> 
> DCS modulation needs to be sent into a varactor modulator stage... 
> Direct FM exciters on Mastr II can do it native on the CTCSS port... 
> Older Phase Modulated exciters need to be handled differently... 
> Injecting DCS on the compensation line is a suitable possibility . The 
> suggested discriminator pickoff for DCS is a point in the rx in front of 
> Volume Sq Hi... so best to pick it off with a separate wire.
> 
> Doug
> KD8B
> gervais wrote:
>>
>> hi all
>> my master 2 repeater has a tone of 141.3 hz.
>> i remember that when i programm my Phoenix i can setup a DCS tone 
>> ,Digital code.
>> Is there a board that you slot into the Master 2 so it could use a DCS ?
>> thanks
>> Gervais ve2ckn
>> 
> 
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 






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[Repeater-Builder] Re: PURC Lowband station SCR replacement

[skipp025]

Teccor 

http://www.littelfuse.com/products/Acquired+Brand/Teccor/search.html 

s. 

> Joe  wrote:
> Just a long shot
> We are repairing a PURC high power base station that 
> uses an SCR marked 9349 for switching a bias voltage.  
> Anyone know of a source or replacement for the Motorola 
> 9349 SCR?
> Thanks,
> Joe
>

[Repeater-Builder] TM-g707 power

[n...@bellsouth.net]

I searched the files but did not see what I needed. Is there a pot/mod in the 
g707a to turn the med-power level up to 20-25watts or turn the hi-power setting 
down to 20-25 watts Have found nothing on the internet searching for mods 
fer this rig.
 Not sure just how warm the rig gets using it as a remote base. The fan helps I 
know, but 50 watts on hi-power is pretty much fer continous duty at times.

Thanks,
Dennis  no5c

[Repeater-Builder] PURC Lowband station SCR replacement

[Joe]

Just a long shot

We are repairing a PURC high power base station that uses an SCR marked 
9349 for switching a bias voltage.  Anyone know of a source or 
replacement for the Motorola 9349 SCR?

Thanks,
Joe

Re: [Repeater-Builder] RFS TDE-7780A

[Joe]

Correct, but if I remember you were claiming 3dB loss at the pass 
frequencies.  I was seeing about 1.5dB loss.  I claimed respectable 
results, not perfect results.  I think it is still acceptable for ham 
use.  Everything is a compromise when you push the equipment past it's 
limits, but the typical ham is frugal (aka me) and accepts a little 
degradation for economy.

73, Joe, K1ike
Another parsimonious Yankee ham.

73, Joe, K1ike

Eric Lemmon wrote:
> Joe,
>
> Your screen shots actually prove my point.  Both of the pass plots reveal
> that your duplexer's pass response is far from optimum, which is precisely
> the reason for selecting the proper duplexer model to tune.  If your
> duplexer was originally designed for operation in the 440-450 MHz band, the
> peak of the pass plots and the nadir of the notch plots would be exactly 5
> MHz apart.  Your TX pass plot shows that the peak is about 900 kHz to the
> left of your desired frequency, and your RX pass plot shows that the peak is
> off-scale to the right- considerably more than a MHz away from the desired
> frequency.
>
> 73, Eric Lemmon WB6FLY
>
>
> -Original Message-
> From: Repeater-Builder@yahoogroups.com
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe
> Sent: Friday, February 05, 2010 6:55 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: Re: [Repeater-Builder] RFS TDE-7780A
>
>   
>
> Eric,
>
> I tuned up a 633-6A from a GR-300 recently and got some respectable 
> results. Pass frequency loss was around -1.5dB and notch loss was 
> around -85 to -90dB. I've attached the sweeps.
>
> 73, Joe, K1ike
>
> Eric Lemmon wrote:
>   
>> Paul,
>>
>> The Motorola TDE7780A duplexer is simply a relabeled Celwave 633-6A-2N
>> 
> unit,
>   
>> and it is designed for 450-470 MHz. It is the standard duplexer furnished
>> in GR300, GR1225, RKR1225, and CDR700 repeaters. The duplexer is okay for
>> non-critical use at low-density RF sites, such as at construction sites.
>> The compact mobile notch design has very little bandpass action, since its
>> operation is based solely upon the notch.
>>
>> I have tried to tune such duplexers down into the Amateur 70cm band, with
>> little success.
>> 
>
>  
>
>
>
> 
>
>
>
> Yahoo! Groups Links
>
>
>
>
>   

Re: [Repeater-Builder] Master 2 and DCS

[Doug Bade]

There used to be an add on board from Comm Spec that could add 
DCS/DCG/DPL to a suitable radio. Many aftermarket repeater controllers 
can do DCG/DCS.

DCS modulation needs to be sent into a varactor modulator stage... 
Direct FM exciters on Mastr II can do it native on the CTCSS port... 
Older Phase Modulated exciters need to be handled differently... 
Injecting DCS on the compensation line is a suitable possibility . The 
suggested discriminator pickoff for DCS is a point in the rx in front of 
Volume Sq Hi... so best to pick it off with a separate wire.

Doug
KD8B
gervais wrote:
>
> hi all
> my master 2 repeater has a tone of 141.3 hz.
> i remember that when i programm my Phoenix i can setup a DCS tone 
> ,Digital code.
> Is there a board that you slot into the Master 2 so it could use a DCS ?
> thanks
> Gervais ve2ckn
> 







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[Repeater-Builder] Re: Space-saving 6m repeater antenna?

[skipp025]

Hi Stranger, 

> "rfburnz"  wrote:
> Having used the DB-212 for a 6M repeater project, I can assure 
> you they work extremely well (unless you are on a rf noisy 
> hilltop like I was (emphasize WAS!) 

I measured about 11 dB of 53MHz desense at what I believe is the 
site you're talking about, which is better than the measured 13dB 
desense down at 42MHz. Although it's not great, it is quite usable. 
Let's put your six meter box back on the air... or do your ten 
meter box... 

> This is because they have more metal hanging out there to 
> capture signals (half wave) but more important they are a 
> side mtd antenna withe a cardioid pattern. 

I'm a strong believer in having more antenna real estate to 
improve what I informally call the available antenna surface 
area target, which gets even more important as the frequency 
gets into the UHF band (rises). 

A side mounted antenna will probably never be a true omni pattern 
and the cardioid pattern can be used to null problems and/or 
enhance coverage areas (the obvious). 

> Well, before someone pipes in, yes, for omnidirectional 
> coverage you need two or four or, if you have LOTS of tower 
> space, combine SIX of them like the 6M repeater in  Nixa, 
> MO that I posted info on recently.   

I'm using modified Kreco and Sinclair SD-110 Antennas. 

> Here's a link to modification instructions on both the 
> DB-201 and DB-212
> http://www.xanaduu.com/db201/

Interesting... thanks. I just drew out the information for the 
70 MHz Decibel Folded Dipole. I have to get that scanned into 
pdf to make it available but it will get done. 

> OT = If someone knows where a 37 MHz DB antenna might be 
> available please let me know, thanks 
> W6MTF   

I'm letting you know... you're overdue for a visit anyway. 
Email me direct when you get a spare moment. 

skipp 




> 
> --- In Repeater-Builder@yahoogroups.com, "Tyke"  wrote:
> >
> > good morning Martin,
> > 
> >Why not use a db-201 folded loop ground plane instead? It is half the 
> > length of the db-212 which needs at least 2 bays to be halfway decent. 
> > (they make em with 3 and 4 bays also.  the pattern off of the 4 bay is the 
> > best for coverage. The 3 bay has too much 3 leaf clover effect). 
> > 
> >Anyhow, I have 4 of the db-201s' right now that i'm shortening for 6m. 
> > It is only about 51-52 inches total height(1/2 wave folded loop). these 
> > antennas' have no gain , but are DC grounded and will side mount Ok. Put it 
> > about 4 ft. out from the tower. 
> > 
> >It seems to me that if you are restricted on antenna space and height 
> > then it can't be a good location or have very good coverage to begin with. 
> > just my opinion!!! These antennas areplentiful. just look for old 
> > busunesses or Police , fire and city gov. locatons that used to use 
> > low-band  many years ago.a j-pole for repeater use is ok too, just real 
> > long!!!
> >
>

[Repeater-Builder] Master 2 and DCS

[gervais]

hi all
my master 2 repeater has a tone of 141.3 hz.
i remember that when i programm my Phoenix i can setup a DCS tone ,Digital code.
Is there a board that you slot into the Master 2 so it could use a DCS ?

thanks
Gervais ve2ckn

[Repeater-Builder] NewBy

[bainbridge_steve]

Hi
Iam a new user to the group. My name is Steve licenced
radio amateur M1SWB and I live in Liverpool UK.
Main interests are building repeaters and fixing them :-)
Iam currently building a 6mtr unit and need a Procom
DPF 6/6 HX-150 duplexer, so if anyone has such a beast
for sale, please contact me.

73

Steve

Re: [Repeater-Builder] DB-4072 duplexers

[Gary Hoff]

I tuned one at one time on 447.05/442.05 and it worked well.  Don't
remember the rejection numbers though.
Gary - K7NEY


On 2/5/2010 9:52 PM, James Adkins wrote:


Wondering if anyone knows if the 6-cavity set of DB-4072's made for 
450-470 MHz will go down to 444.425 MHz / 449.425 MHz?



I know the specs say only down to 450, looking for anyone that's tuned 
these in the real world and how low you've tuned them.


Thanks,

--
James Adkins, KB0NHX

RE: [Repeater-Builder] RFS TDE-7780A

[Eric Lemmon]

Joe,

Your screen shots actually prove my point.  Both of the pass plots reveal
that your duplexer's pass response is far from optimum, which is precisely
the reason for selecting the proper duplexer model to tune.  If your
duplexer was originally designed for operation in the 440-450 MHz band, the
peak of the pass plots and the nadir of the notch plots would be exactly 5
MHz apart.  Your TX pass plot shows that the peak is about 900 kHz to the
left of your desired frequency, and your RX pass plot shows that the peak is
off-scale to the right- considerably more than a MHz away from the desired
frequency.

73, Eric Lemmon WB6FLY


-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe
Sent: Friday, February 05, 2010 6:55 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] RFS TDE-7780A

  

Eric,

I tuned up a 633-6A from a GR-300 recently and got some respectable 
results. Pass frequency loss was around -1.5dB and notch loss was 
around -85 to -90dB. I've attached the sweeps.

73, Joe, K1ike

Eric Lemmon wrote:
> Paul,
>
> The Motorola TDE7780A duplexer is simply a relabeled Celwave 633-6A-2N
unit,
> and it is designed for 450-470 MHz. It is the standard duplexer furnished
> in GR300, GR1225, RKR1225, and CDR700 repeaters. The duplexer is okay for
> non-critical use at low-density RF sites, such as at construction sites.
> The compact mobile notch design has very little bandpass action, since its
> operation is based solely upon the notch.
>
> I have tried to tune such duplexers down into the Amateur 70cm band, with
> little success.