gman1971
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Posts posted by gman1971
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@PACNWCommsvery nice. It really helps when you get radios for free... haha.
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Added the Astro System Saber, but there isn't much info really. Certainly not as detailed as the newer radios spec sheets are.
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9 hours ago, JLeikhim said:
I wish Motorola had continued with the Saber form factor. The later Astro XTS and APX radios are sort of bizarre and bulbous in styling.
They sort of did with the XPR7550 radios, they look like mini Saber radios...
G
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12 hours ago, K7lon said:
Thank you for the information.
The fumie was tuned to the frequency with a cheap spectrum analyzer/ signal generator. The cabling is good quality rg58 coax with no adapters six inches long. I used a bird power meter for testing, 5watts into the duplexer .5watts out to the antenna. I have a celwave and a Hong Kong unit preforming much better.
That seems like a 10 dB insertion loss. I would use a Return Loss Bridge (RLB) to tune duplexers, its far easier than tuning them with the Analyzer alone.
G.
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2 hours ago, PACNWComms said:
Those System Saber radios were awesome. I still see some in use in some parts of the country, especially California law enforcement. I myself still use a VHF Astro Saber Model 3 for some uses as well. Had to eventually upgrade to a Lithium Ion battery, which makes it slightly shorter now, and required a newer multi-chemistry charger. But still a very capable and useful radio. If mine were in UHF, they would be used for GMRS for sure. I gave two away to amateur radio type friends and now only have two myself. They were removed from a maritime environment, spares for use on motorized barges used to transport oil products along the West coast. The Saber radios do have excellent specifications for the time they were manufactured.
The XPR7550 was heavily inspired by the Astro radios... that is why I like the XPR7550e so much... I used to like those old Astro radios...
On a different note... Seems like PAC owns at least one of every Motorola radio model built to date... Is there a Motorola radio model you don't own?
impressive!
G.
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Can you try a 10dB attenuator on the comet when placed high?
G.
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yep, another CCR trash transmitter... spewing stuff all over the band.... nothing new.
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If the antenna is fine, its most likely receiver desense. What radio are you using?
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Speaking of the R7, here is an unboxing video
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Just now, tweiss3 said:
Are they as convenient as they seem like they should be? Looks like a good way to save tons of space, be hidden most of the time, and operate nearly identical to the HT. Too bad they double the cost of the radio, or they would be a no brainer.
Yes, I think so. They transform the 5550e into an XPR7550e with 50W.
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What you are experiencing might be receiver desense. Try adding a 10dB attenuator to the radio see if reception improves. You didn't specify what radio you were using.
G.
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15 minutes ago, tweiss3 said:
That weight and size difference doesn't seem too bad. Its more of a width increase than anything.
Speaking of MOL, does anyone use the HHCH (PMLN7131) with their mobile?
width and height.
I have several HHCH heads for my 5550e radios.
G.
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Looks like its an FRS radio. No license required to operate in FRS.
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I would strongly advice against posting how to crack or obtain passwords from radios.
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10 hours ago, mbrun said:
Just recently acquired an HP distortion analyzer so that I can confirm sensitivity against the rated SINAD value rather than relying on when the radios open squelch at the lowest setting.
Nice, looks like it has a SINADDER built in then. Which model?
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Very nice, the one I am using is this one:
https://www.minicircuits.com/pdfs/ZX60-P103LN+.pdf
It has a very high IP3 and it works very well even in very high noise sites.
G.
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Quien es el que esta hablando Español?
G.
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7 hours ago, JohnE said:
17dB w/0.5 noise figure. forgot to mention there is a pre selector in front of the LNA w/1dB insertion loss. duplexer is 0.9 loss. the net gain w/cable and insertion losses is ~11.5dB. its a little hot.
not bad, what is the IP3?
My LNA has an 11dB pad after it... but I also have a much shorter run so the net gain on mine is about ~8dB.
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10 minutes ago, JohnE said:
my over all loss at my remote site is ~2.5db. here is the breakdown, Pa into a celwave bp/br duplexer -.8, Connecticut microwave isolator -.4, 5' FSJ4 (1/2" superflex), polyphaser mounted on a ground bar and 95' of LDF5 50A -.8.
It was initially tested w/100W PA that gave me ~75W at the antenna port. once the antenna was up it was checked w/site master and showed an SWR of 1.35 and a return loss IIRC was ~16. power reading was 75W FWD/1.5W REF.There is also a DEI LNA on the Rx side w/3db pad.
Nice.
Whats the LNA gain?
Base Antenna List
in Technical Discussion
Posted
This is why it is recommended "drilling the hole"
G.