July 2023

Assembling a Diamond X300N antenna

Recently, I noticed the 2m flower-pot antenna that has been my home base antenna for some 15 years now, had developed a high VSWR. Either that, or the feed-line had. I haven’t tried troubleshooting which.

I tried a mobile antenna on a mag-mount base sat atop the corrugated iron roof of the deck, plugged in where the flow pot connects, and got good results there, so I think the cabling going from the back deck into my room is fine, it’s just the section that connects to the bulk-head BNC to the outside world and/or the antenna itself.

That section includes a 3m-length of HDF-400 coax, purchased back in the days of the now defunct Brisbane Mesh. I figured if the coax is bad, okay, I’ll re-use the flower-pot for other requirements (it’d be great as a small antenna to use at Imbil), the base antenna could use an upgrade anyway.

I ordered a Diamond X300N, something that would have decent gain on 2m/70cm, not be too obnoxiously large, and still should allow me to get a signal out up high. I ordered it through Andrews Communications, and it arrived late last week… today I finally got around to putting it together.

The instructions seemed simple enough:

Okay, so insert this bit into that bit… sounds simple enough, except:

(1) the tip of the lower element has a tag on it saying “do not pull on this” (fair enough), and
(2) the coupling I’m supposed to insert it into is buried far down the end of the upper antenna section

Turns out, you can put the hack-saw away, the answer is simple enough. The top-section can slide back and forth, and in transit it may settle inside the tube. You grab the top-section by the upper outer-shell joint to stop it rattling, and bang the whole lot against a flat surface to encourage gravity to “pull” that upper conductor down. Eventually it reaches the bottom and you can pull it out with conventional needle-nose pliers.

The instructions are pretty straight-forward from here, although installation will have to wait until someone is here to guard the door or until “Jesus Cat” is sound asleep, as I’m not having a repeat of last week-end again.

Missing cat, “Sam”: Lower Eranga St, The Gap — FOUND

Current situation

He has returned this morning. Tracey sent me a message via SMS reporting some neighbours across the street from me had spotted him sleeping on their outdoor lounge. When they tried to catch him, he made a bolt for it and disappeared.

I had a quick shower and got dressed, then went outside to have a look around. Sure enough, he was across the street, and on seeing me, immediately came running. The bed bug is back. I think it’ll be supervised outdoor access only from now on.

Unconfirmed sightings

At around 6PM on Friday, whilst I was searching the back yard with a headlight, I did spot what appeared to be two green eyes like Sam’s reflecting back at me, the headlight however seemed to spook the cat and it disappeared, not seen since. This would have been in the back yard / fence between the properties 92 / 94 Settlement Road.

Later around 8PM, I did another walk, and saw another cat, not unlike Sam frolicking around Eranga St / Katoa St… however I also know there is a cat that lives in that area very similar to Sam (possibly a Burmese or Russian Blue). This cat dived under a parked van.

Update 2023-07-01T18:09 With the help of neighbour Tracey, I was able to get a photo and a small post sent to ‘The Gap Grapevine’ Facebook Group. Via that group, a resident in Tamboura Ct reportedly saw a cat matching Sam’s description around mid-day Friday. Tracey and I did a quick search in that area, and I re-visited that area this evening, walking up to where the old quarry was, crossing Settlement Road, and walking back. Thankfully no signs of fresh road kill, but no cat either.

Areas searched

I have done several walks around lower Eranga St. / Katoa St / Kaloma Rd / Settlement Rd, down to Chaprowe Rd. Neither the cat nor any signs of road kill were observed along the route.

I also did a walk down around Michalea Cres, with no sightings.

Description

  • Name: Sam
  • Sex: Male
  • Breed: Russian Blue / Domestic Shorthair Cross
  • Age: Very close to 8 years old
  • Weight: 10.4kg at last weigh-in
  • Temperament: Usually quite relaxed, but is known to give people a nip
  • Desexed: Yes, but some parts (“decorative” in function now) remain
  • Microchipped: Yes, HomeSafeID tag ending in …1857
  • Collar: No
  • Diet: Eats a mix of roo or beef mince and dry biscuits usually a large teaspoon of mince and ⅛ cup of biscuits morning and afternoon. At present he’s on metabolic biscuits to try and get his weight down.
  • Health issues: none other than having a bit of weight on him.
  • Veterinary Clinic: The Gap Vet Surgery, corner Settlement Rd / Waterworks Rd, The Gap.

Contact details

No longer relevant.

Has he been known to roam before?

Yes, but usually the pattern is he’ll visit neighbours for a few hours, then return home.

Prior to me adopting him in 2020 from my maternal grandmother (who had suffered a fall that would later prove fatal), he had been known to occasionally go out on multi-night jaunts, but until now had always come home after an hour or two.

Outdoors access

He is normally let out in the mornings (as he is an outdoor cat) with the expectation that he’s back in a few hours. At 3PM he’s normally inside bellowing for dinner, so we usually will shut the door at that point and keep him indoors overnight.

There are no “cat doors” at our property.