Re: Quantar TFD6512A Preselector Filter
That's basically what I do, but using an off-site weak signal.? After all the goal is to be able to hear the weakest of signals.? In doing it that way I've not experienced any shift in the duplexer notches.
?
Burt, K6OQK
?
VHF or UHF? I just inject a signal and tune for best Sinad sensitivity in the speaker..
Chris WB5ITT
|
Re: Andrew 7/8" Hardline Connector Needed
Jeff, I tried to send to? you TWICE off list here using your QRZ.com email.? Both times bounced back undeliverable. -m
?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]>
On Behalf Of Jeff DePolo WN3A via groups.io
Sent: Saturday, March 15, 2025 11:10 AM
To: [email protected]
Subject: Re: [repeater-builder] Andrew 7/8" Hardline Connector Needed
?
See attached PDF for examples.? To the OP – if you’re interested in a connector email direct.
?
??????????????????????????????????????????????????????????????????????????????? --- Jeff WN3A
?
|
Re: Andrew 7/8” with Solid Center
That is very old stuff. ?Used to see it in the late 80’s at sites I was decommissioning for an IMTS telephone company. ?I believe you will find the corrugation on the outer tube is a continuous spiral?
?
Justin
|
Re: Andrew 7/8" Hardline Connector Needed
See attached PDF for examples.? To the OP – if you’re interested in a connector email direct. ? ??????????????????????????????????????????????????????????????????????????????? --- Jeff WN3A ?
|
Re: Andrew 7/8" Hardline Connector Needed
Prodelin, Cablewave, and Phelps-Dodge all made 7/8” with a solid center (copper-clad aluminum, akin to ?”). ??Pics and details to follow… ? ??????????????????????????????????????????????????????????????????????????????????????????????? --- Jeff WN3A ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of Matt
Sent: Saturday, March 15, 2025 9:40 AM
To: [email protected]
Subject: Re: [repeater-builder] Andrew 7/8" Hardline Connector Needed? I interpreted your description a tad incorrect lol. Since Andrew never had a solid center in 7/8. I previously had a fella say he had 7/8 with a solder center but he didn’t know. ? Matt ? ? Nope…that center pin screws into the center conductor. The type I need would SOLDER onto the center from what I see. But, thanks.? - Mike ? ?
? Matt AL0R ? ? I have a length of the older SOLID CENTER CONDUCTOR 7/8” hardline and need one connector. I am not particular about the gender but an “N” female would be most useful. If one is available please contact me off list with your price including shipping to 34221. I would like to have this mid week next week if possible. If you do not HAVE a connector but know what MODEL NUMBER this type is, it might also be helpful. The cable is NOT the very old SPIRAL type but is the concentric circle type solid center. Thanks in advance. ?
|
Re: Andrew 7/8" Hardline Connector Needed
I interpreted your description a tad incorrect lol. Since Andrew never had a solid center in 7/8. I previously had a fella say he had 7/8 with a solder center but he didn’t know. ? Matt ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of MIke Ryan via groups.io
Sent: Friday, March 14, 2025 21:05
To: [email protected]
Subject: Re: [repeater-builder] Andrew 7/8" Hardline Connector Needed? Nope…that center pin screws into the center conductor. The type I need would SOLDER onto the center from what I see. But, thanks.? - Mike ? ?
? Matt AL0R ? ? I have a length of the older SOLID CENTER CONDUCTOR 7/8” hardline and need one connector. I am not particular about the gender but an “N” female would be most useful. If one is available please contact me off list with your price including shipping to 34221. I would like to have this mid week next week if possible. If you do not HAVE a connector but know what MODEL NUMBER this type is, it might also be helpful. The cable is NOT the very old SPIRAL type but is the concentric circle type solid center. Thanks in advance. ?
|
Re: Andrew 7/8" Hardline Connector Needed
Thanks Jeff..I will be looking for your report on those. - Mike
?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]>
On Behalf Of Jeff DePolo WN3A via groups.io
Sent: Saturday, March 15, 2025 9:31 AM
To: [email protected]
Subject: Re: [repeater-builder] Andrew 7/8" Hardline Connector Needed
?
- I THINK It was sold under Prodelin but Celwave was also a seller....the connector is Hex shaped on the outside....the one I have is male N but a barrel is pretty tight on it making
it a female N connection...
?
All of the 7/8” Prodelin I’ve seen from that era had an aluminum shield.? Not made by, or the same as, Cablewave.? Cablewave first made FLC78 using a solid center and then later
changed to a hollow center but kept the same part number.? I probably have connectors, will look later.
?
??????????????????????????????????????????????????????????????????????????????????????????????????????????????? --- Jeff WN3A
?
?
|
Re: Andrew 7/8" Hardline Connector Needed
- I THINK It was sold under Prodelin but Celwave was also a seller....the connector is Hex shaped on the outside....the one I have is male N but a barrel is pretty tight on it making it a female N connection...
? All of the 7/8” Prodelin I’ve seen from that era had an aluminum shield.? Not made by, or the same as, Cablewave.? Cablewave first made FLC78 using a solid center and then later changed to a hollow center but kept the same part number.? I probably have connectors, will look later. ? ??????????????????????????????????????????????????????????????????????????????????????????????????????????????? --- Jeff WN3A ? ?
|
Re: Quantar TFD6512A Preselector Filter-Additional
Use 6 dB pads on the TG output and SA inputs for the most accurate filter? alignment. The possible detuned duplexer notches will be on the RX cans that are tuned to reject the TX frequency.?
?
John
---------- Original Message ----------
From: "John via groups.io" <jhaserick84@...>
Date: 03/15/2025 9:01 AM EDT
Subject: Re: [repeater-builder] Quantar TFD6512A Preselector Filter
?
?
Hi Jeff,
?
Once you get the flat top response curve with minimum loss, you ideally should check at your operating frequency, with a return loss bridge connected to the filter input with the receive end of the filter connected to a 50 ohm load, (to keep from detuning the duplexer notch,) then again with the receiver or RX pre-amp connected. Keep the level of the tracking generator to below -10 or -20 dBM so as not to overload the RX or pre-amp.?
?
If you do not have a RLB, you could use an antenna bridge on your RX frequency, with the 50 ohm load, but not the RX input, as the antenna bridge output is most likely at too high a level for anything solid state to handle without detuning..
?
John
On 03/14/2025 8:26 PM EDT Jeff Acree via groups.io <locustpointlight@...> wrote:
?
?
Friends,
?
I need to retune the subject preselector and was wondering if there are any procedures someone could share or point me to.? I have a HP8320B and a HP8935 to do the work with, but I could not find any procedures in either the Instruction manual or the service manual.? Perhaps I overlooked it.?
?
Thanks!
Jeff KC8VFN
|
Re: Quantar TFD6512A Preselector Filter
Hi Jeff,
?
Once you get the flat top response curve with minimum loss, you ideally should check at your operating frequency, with a return loss bridge connected to the filter input with the receive end of the filter connected to a 50 ohm load, (to keep from detuning the duplexer notch,) then again with the receiver or RX pre-amp connected. Keep the level of the tracking generator to below -10 or -20 dBM so as not to overload the RX or pre-amp.?
?
If you do not have a RLB, you could use an antenna bridge on your RX frequency, with the 50 ohm load, but not the RX input, as the antenna bridge output is most likely at too high a level for anything solid state to handle without detuning..
?
John
On 03/14/2025 8:26 PM EDT Jeff Acree via groups.io <locustpointlight@...> wrote:
?
?
Friends,
?
I need to retune the subject preselector and was wondering if there are any procedures someone could share or point me to.? I have a HP8320B and a HP8935 to do the work with, but I could not find any procedures in either the Instruction manual or the service manual.? Perhaps I overlooked it.?
?
Thanks!
Jeff KC8VFN
|
Re: Andrew 7/8" Hardline Connector Needed
I THINK It was sold under Prodelin but Celwave was also a seller....the connector is Hex shaped on the outside....the one I have is male N but a barrel is pretty tight on it making it a female N connection...
Get with me in direct email....wb5itt at att dot net
Chris WB5ITT
On Sat, Mar 15, 2025 at 6:50?AM Chris Boone WB5ITT via <setxtelecom= [email protected]> wrote: UUUHHHHH NO...If you look at the center pin, it has THREADS on it....hard to screw that into solid center conductor.....
|
Re: Quantar TFD6512A Preselector Filter
Excellent idea.? I will dig out my probe and MSF 5000 Preselector tuning instructions today.? Thanks!
|
Re: Andrew 7/8" Hardline Connector Needed
UUUHHHHH NO...If you look at the center pin, it has THREADS on it....hard to screw that into solid center conductor.....
|
Re: Andrew 7/8" Hardline Connector Needed
7/8 inch with solid center conductor is likely Celwave cable, not Andrew....I never have seen Andrew with solid center.....I guess its possible but the Celwave stuff Ive?used is solid and looks like Andrew on the outside...I have one connector here at the house if? you are interested...
Chris WB5ITT
I have a length of the older SOLID CENTER CONDUCTOR 7/8” hardline and need one connector. I am not particular about the gender but an
“N” female would be most useful. If one is available please contact me off list with your price including shipping to 34221. I would like to have this mid week next week if possible. If you do not HAVE a connector but know what MODEL NUMBER this type is, it
might also be helpful. The cable is NOT the very old SPIRAL type but is the concentric circle type solid center. Thanks in advance.
?
|
Re: Win10 CDM/HT Out of Band and Region Code Mods
This is just a thought. I had old sp50’s and if you don’t know they don’t like to move very well.?
I did the hex edit in those to cover 0.00 to 999
mainly to use on 2 meters but say I got a uhf one, I didn’t have to hex edit again.?
why not just hex edit to cover everything and if you get another radio it’s already done.?
worked for me.?
|
Re: 19 inch rack mount cabinet for sale.
It’s a shame I got a small 4 foot ge cabinet but in South Carolina?
|
Re: Quantar TFD6512A Preselector Filter
The helical casting does have the holes to insert the white probe cable that the MSF5000 uses and the instruction manual does come with that cable if you ordered it.
It's more or less the same procedure as the MSF, just a smaller filter.
On Fri, Mar 14, 2025, 18:57 Jeff Acree via <locustpointlight= [email protected]> wrote: I am currently configured for the alternative method DCFLuX mentioned below using the tracking generator feature.? I tune the duplexer notches in the same manner.? I was wondering if there is a preferred sequence for the five adjustments or anything else I should know.? The Motorola instructions for retuning a MSF5000 pre-selector are pretty solid.? For this thing I have next to nothing.? I am already wondering if I should just stick with what I know (MSF5000s) even though they are antiques.? Greatly appreciate any advice I can get.
?
Thanks!
Jeff
|
Andrew 7/8” with Solid Center
|
Re: Andrew 7/8" Hardline Connector Needed
Nope…that center pin screws into the center conductor. The type I need would SOLDER onto the center from what I see. But, thanks.? - Mike
?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]>
On Behalf Of Matt
Sent: Friday, March 14, 2025 9:57 PM
To: [email protected]
Subject: Re: [repeater-builder] Andrew 7/8" Hardline Connector Needed
?
?
Matt
AL0R
?
?
I have a length of the older SOLID CENTER CONDUCTOR 7/8” hardline and need one connector. I am not particular about the gender but an “N” female would be most useful. If one is available please contact me
off list with your price including shipping to 34221. I would like to have this mid week next week if possible. If you do not HAVE a connector but know what MODEL NUMBER this type is, it might also be helpful. The cable is NOT the very old SPIRAL type but
is the concentric circle type solid center. Thanks in advance.
?
|
Re: Quantar TFD6512A Preselector Filter
I am currently configured for the alternative method DCFLuX mentioned below using the tracking generator feature.? I tune the duplexer notches in the same manner.? I was wondering if there is a preferred sequence for the five adjustments or anything else I should know.? The Motorola instructions for retuning a MSF5000 pre-selector are pretty solid.? For this thing I have next to nothing.? I am already wondering if I should just stick with what I know (MSF5000s) even though they are antiques.? Greatly appreciate any advice I can get.
?
Thanks!
Jeff
|
Burt K6OQK
MIke Ryan
Chris Boone WB5ITT
