Radio shack pro 652

[AngWay]

Do you have an outside antenna? We had a paging transmitter getting into all our scanners in the newsroom. I installed a 2-stage tunable notch filter into the antenna line which eliminated the problem. How are you feeding the antenna to the SDR and 652? You could have signals from the dongle getting into the 652. You need isolation between receivers sharing a common antenna. We have had oscillator signals from scanners interfering with each other. Try turning off the computer with the dongle. Connect the antenna to the 652 only (with FM filter inline) and see if the interference on the 652 goes away. If you have a preamp on an outside antenna with a FM or TV station nearby, the preamp can overload and have intermod problems which creates all kinds of interfering signals. If you have a preamp on your antenna (outside or inside), get rid of it.

Yes i have a outside antenna. i'm using rg6 coax i have a LNA and i tried removing it to see if it helped but it did not. btw i'm not using the 652 yet it has not arrived i'm using 3 rtl-sdr dongles and a sds100 . like i told @jonsmth the onverload only happens when i'm near 152.6825

 

[RMason]

the signal that is causing my overload is 152.6825 it's the control channel for honaker in STARS

I could be wrong, but I seriously doubt that 152.6825 is the source of your overload/interference - I believe it is simply a victim of the interference. You videos have shown a strong signal at 152.265/152.270Mhz that corresponds to your interference. You stated in several threads including This Post that this frequency "pops up when the overload starts". This frequency (152.265/152.270) is most likely a paging frequency.

Regardless, I would confirm what frequency is the source of your interference before spending $$$ on filters. You might be able to find a variable frequency notch filter (but I haven't seen any for the frequency you are looking for)

 

[tvengr]

What is the gain of the LNA and the length of your cable run? What is the location of the LNA? If the LNA is being overloaded, the intermod can create spurious frequencies outside the range of your FM filter. The PRO-652 is prone to receiver overload. It may function better without the LNA.

 

[AngWay]

I could be wrong, but I seriously doubt that 152.6825 is the source of your overload/interference - I believe it is simply a victim of the interference. You videos have shown a strong signal at 152.265/152.270Mhz that corresponds to your interference. You stated in several threads including This Post that this frequency "pops up when the overload starts". This frequency (152.265/152.270) is most likely a paging frequency.

Regardless, I would confirm what frequency is the source of your interference before spending $$$ on filters. You might be able to find a variable frequency notch filter (but I haven't seen any for the frequency you are looking for)

Well the issue only happens when that freqs 152.6825 is in view on the spectrum it never happens whenever it's out of view. and it is the strongest freqs i have in the entire spectrum . so it has to be the one. nothing else makes any sense. Here is a long video i took showing how things are. the 152.68125 freqs is the problem i believe but i listen to all those other freqs u see around it. notice at the end of the video i go to the 450mhz and u don't really see any overload u don't see it when i'm in the 155mhz either it's the most worse when i'm next to the 152.68125

 

[AngWay]

What is the gain of the LNA and the length of your cable run? What is the location of the LNA? If the LNA is being overloaded, the intermod can create spurious frequencies outside the range of your FM filter. The PRO-652 is prone to receiver overload. It may function better without the LNA.

The lna is in the house the antenna is on the roof the length of the coax is 32 feet. i have tried removing the LNA but it doesn't help.

 

[AngWay]

I have tried lowering the gain as well as low as i can and it still happens

 

[AngWay]

The radio shack pro 652 says it has the feature Motorola I/II/III isn't that DMR? from what i have read thats DMR. what am i missing about that?

 

[tvengr]

The 652 can receive Motorola Type 2 and P25 Phase 1 systems. It cannot receive P25 Phase 2, DMR, or NXDN. Motorola Type II systems are at end of life and are rapidly disappearing. An LNA should be placed at the antenna to raise the signal level and increase the signal to noise ratio. It can make up for loss of signal on the coax run and reduce noise pickup on the coax. You lose that advantage by placing an LNA inside.

 

[wtp]

and take note
phase 2 =/= type 2

 

[AngWay]

The 652 can receive Motorola Type 2 and P25 Phase 1 systems. It cannot receive P25 Phase 2, DMR, or NXDN. Motorola Type II systems are at end of life and are rapidly disappearing. An LNA should be placed at the antenna to raise the signal level and increase the signal to noise ratio. It can make up for loss of signal on the coax run and reduce noise pickup on the coax. You lose that advantage by placing an LNA inside.

So i don't understand this DMR is motorola right , the way i have been understanding it is motorola type 3 is dmr tier 3 or trunked dmr and motorola 1 is conventional dmr . is that not how it is?

Like this pic i see this alot when researching scanners and i have always assumed that that means DMR. i'm sure i'm wrong so what is motorola type 1/2 . and on the RRDB i only see FM FMN P25 DMR NXDN48/96

 

[buddrousa]

No plain and simple
Analog is Anolog
P25 is P25
DMR is DMR
NXDN is NXDN
Motorola is a RADIO BRAND not a RADIO FORMAT

 

[AngWay]

No plain and simple
Analog is Anolog
P25 is P25
DMR is DMR
NXDN is NXDN
Motorola is a RADIO BRAND not a RADIO FORMAT

if motorola is just a brand why is there a type 1 and a type 2 . it sounds like it's a format

 

[Enjoi19]

if motorola is just a brand why is there a type 1 and a type 2 . it sounds like it's a format

Motorola Type 1 and Type 2 (and its many variants) are now end of life trunking systems. There’s very few left and are unrelated to DMR.

 

[AngWay]

Motorola Type 1 and Type 2 (and its many variants) are now end of life trunking systems. There’s very few left and are unrelated to DMR.

Oh ok gotcha... with the sds100 when your scanning conventional freqs and you have like 8 different counties in your fav list it goes through the county names really fast and each of those counties have like 20 freqs in them and u don't see all those freqs as it's scanning . does it scan that fast that u can't see the freqs or does it not scan each freqs .

 

[RMason]

Oh ok gotcha... with the sds100 when your scanning conventional freqs and you have like 8 different counties in your fav list it goes through the county names really fast and each of those counties have like 20 freqs in them and u don't see all those freqs as it's scanning . does it scan that fast that u can't see the freqs or does it not scan each freqs .

I think that there was a good answer to this question here:
Finally got my sds100 need some guidance on programming it. : #195

 

[AngWay]

Does anyone know what the two holes are on the back of the radio shack pro 652? i have read the manual and searched online but i can't find anything. the scanner already has a headphone jack on the front of it and a pc/if plugin which is for programming correct?
what are the two on the back for? Thanks

 

[fxdscon]

Does anyone know what the two holes are on the back of the radio shack pro 652? i have read the manual and searched online but i can't find anything. the scanner already has a headphone jack on the front of it and a pc/if plugin which is for programming correct?
what are the two on the back for? Thanks

The one labeled EXT SP is for an external speaker. The one to the left of that is a threaded mounting hole for custom installations.

 

[AngWay]

The one labeled EXT SP is for an external speaker. The one to the left of that is a threaded mounting hole for custom installations.

Oh ok thanks

 

[AngWay]

I have noticed that on the radio shack pro 652 when i turn the squelch know counter clockwise the channel names slow down but if i turn it clockwise they speed up so fast that i can't read them. What is this? what is the scanner doing when i do that is that a scan speed option or what?

 

[Nasby]

You don’t want it set to where you can read the channel names.
Ideal setting is to have the white line at around the 11 o’clock position.