{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:E75OMTHAR4DRNMZG3QLATUAZ4A","short_pith_number":"pith:E75OMTHA","schema_version":"1.0","canonical_sha256":"27fae64ce08f0716b326dc1609d019e02a63ee7b96d7fa72ace0bd3ff7c7ac4c","source":{"kind":"arxiv","id":"2103.10677","version":1},"attestation_state":"computed","paper":{"title":"Ultra-Low Noise L-Band Cryogenic Astronomical Receiver for FAST Telescope","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Chuan He, Hang Zhang, Hong-Fei Liu, Jin Wang, Jin-You Song, Ming-Lei Guo, Peng Jiang, Sheng-Wang Wang, Xiang-Wei Shi, Yang Wu","submitted_at":"2021-03-19T08:03:24Z","abstract_excerpt":"This paper presents an ultra-low noise L-band radio astronomical cryogenic receiver for FAST telescope. The development of key low noise microwave parts of Coupling-LNA and conical quad-ridge OMT and reasonable system integration achieve outstanding performance of receiver.It covers the frequency range of 1.2 GHz to 1.8 GHz. Novel cryogenic Coupling-LNAs with low noise, large return loss, high dynamic range and the function of coupling calibration signals are developed for the proposed receiver.Amplification and coupling function circuits are integrated as a single Coupling-LNA with full noise"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2103.10677","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-03-19T08:03:24Z","cross_cats_sorted":[],"title_canon_sha256":"493f809a259761c43a74edafd390a081e7600be172d52925b8bd9e48856550ec","abstract_canon_sha256":"c9c535ea4a163b10240806a56d43e6fae135ff160a096ca6e8a828bd707123d5"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:12:01.564004Z","signature_b64":"/TUgCIagmWZASd94Vf9R6ZPAs+5xd+yayeZu55UB8OFC7wNPdo63rKUnQWLfMXFdMoOB78xqo9dCB8ZWNbXgAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"27fae64ce08f0716b326dc1609d019e02a63ee7b96d7fa72ace0bd3ff7c7ac4c","last_reissued_at":"2026-07-05T03:12:01.563588Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:12:01.563588Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Ultra-Low Noise L-Band Cryogenic Astronomical Receiver for FAST Telescope","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Chuan He, Hang Zhang, Hong-Fei Liu, Jin Wang, Jin-You Song, Ming-Lei Guo, Peng Jiang, Sheng-Wang Wang, Xiang-Wei Shi, Yang Wu","submitted_at":"2021-03-19T08:03:24Z","abstract_excerpt":"This paper presents an ultra-low noise L-band radio astronomical cryogenic receiver for FAST telescope. The development of key low noise microwave parts of Coupling-LNA and conical quad-ridge OMT and reasonable system integration achieve outstanding performance of receiver.It covers the frequency range of 1.2 GHz to 1.8 GHz. Novel cryogenic Coupling-LNAs with low noise, large return loss, high dynamic range and the function of coupling calibration signals are developed for the proposed receiver.Amplification and coupling function circuits are integrated as a single Coupling-LNA with full noise"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.10677","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2103.10677/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"2103.10677","created_at":"2026-07-05T03:12:01.563644+00:00"},{"alias_kind":"arxiv_version","alias_value":"2103.10677v1","created_at":"2026-07-05T03:12:01.563644+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.10677","created_at":"2026-07-05T03:12:01.563644+00:00"},{"alias_kind":"pith_short_12","alias_value":"E75OMTHAR4DR","created_at":"2026-07-05T03:12:01.563644+00:00"},{"alias_kind":"pith_short_16","alias_value":"E75OMTHAR4DRNMZG","created_at":"2026-07-05T03:12:01.563644+00:00"},{"alias_kind":"pith_short_8","alias_value":"E75OMTHA","created_at":"2026-07-05T03:12:01.563644+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/E75OMTHAR4DRNMZG3QLATUAZ4A","json":"https://pith.science/pith/E75OMTHAR4DRNMZG3QLATUAZ4A.json","graph_json":"https://pith.science/api/pith-number/E75OMTHAR4DRNMZG3QLATUAZ4A/graph.json","events_json":"https://pith.science/api/pith-number/E75OMTHAR4DRNMZG3QLATUAZ4A/events.json","paper":"https://pith.science/paper/E75OMTHA"},"agent_actions":{"view_html":"https://pith.science/pith/E75OMTHAR4DRNMZG3QLATUAZ4A","download_json":"https://pith.science/pith/E75OMTHAR4DRNMZG3QLATUAZ4A.json","view_paper":"https://pith.science/paper/E75OMTHA","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2103.10677&json=true","fetch_graph":"https://pith.science/api/pith-number/E75OMTHAR4DRNMZG3QLATUAZ4A/graph.json","fetch_events":"https://pith.science/api/pith-number/E75OMTHAR4DRNMZG3QLATUAZ4A/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/E75OMTHAR4DRNMZG3QLATUAZ4A/action/timestamp_anchor","attest_storage":"https://pith.science/pith/E75OMTHAR4DRNMZG3QLATUAZ4A/action/storage_attestation","attest_author":"https://pith.science/pith/E75OMTHAR4DRNMZG3QLATUAZ4A/action/author_attestation","sign_citation":"https://pith.science/pith/E75OMTHAR4DRNMZG3QLATUAZ4A/action/citation_signature","submit_replication":"https://pith.science/pith/E75OMTHAR4DRNMZG3QLATUAZ4A/action/replication_record"}},"created_at":"2026-07-05T03:12:01.563644+00:00","updated_at":"2026-07-05T03:12:01.563644+00:00"}